International Conference on High Energy Particle & Astroparticle Physics (ICHEPAP2023)

11 Dec 2023, 09:00 → 15 Dec 2023, 18:30 Asia/Kolkata

Saha Institute of Nuclear Physics

Saha Institute of Nuclear Physics (SINP) is organizing an International Conference on High Energy Particle & Astroparticle Physics (ICHEPAP2023) at SINP from December 11, 2023 to December 15, 2023. We plan to hold the meeting in person, however, we keep open the possibility to switch to hybrid mode if required.

The aim of the conference is to review recent progress in particle and astroparticle physics with particular emphasis on their inter-relations and big data analysis. We foresee this conference to be the first of a series, bringing together theorists and experimentalists from different areas of particle physics and astroparticle physics on a common platform to exchange ideas and start joint collaborative research in future.

The format of the conference is as follows: we will have several plenary talks (40+5 mins) spread over several sessions. Additionally, we also plan to have parallel sessions with both invited (25+5 mins) and contributory (15+5 mins) talks,  grouped into collider and non-collider physics. We encourage young postdocs and senior PhD students to apply for talks in the parallel sessions. There will also be poster sessions where we encourage PhD students to apply for contributions. Preference will be given to students who have at least 1 publication in a reputed journal or have completed a major task in an experimental field. The maximum number of participants can be 90.

Topics to be covered :

• Particle Physics at Colliders
• Physics and Astrophysics of Neutrinos
• Dark Matter
• High Energy Cosmic Rays
• High Energy Gamma-ray Astrophysics.

Participation by INVITATION ONLY

ICHEPAP2023-Contributory-List.pdf

Participants_MSA-II.pdf

Participants_SNBose_GuestHouse.pdf

Participants_VECC-GuestHouse.pdf

QRCode-ICHEPAP23.pdf

Monday, 11 December

09:00 → 09:30 Registration

09:30 → 09:40 Welcome and Opening Remarks

09:40 → 10:00 Welcome Speech by the Director, SINP

10:00 → 10:45 Standard Model Physics (Non Higgs) at LHC

Chair: Sunanda Banerjee

Speaker: Prolay Mal (NISER Bhubneswar)

ProlayMal_ICHEPAP_v1.pdf

ProlayMal_ICHEPAP_v1.pptx

10:45 → 11:30 High Tea

11:30 → 12:15 Higgs Physics (SM & BSM) at the LHC

Chair: Sunanda Banerjee

Speaker: Vivek Sharma (University of California, San Diego, USA)

HiggsreviewICHEPAP-Final.pptx

12:15 → 13:00 Precision Physics from Lattice QCD

Chair: Sunanda Banerjee

Speaker: Marina Krstic Marinkovic (Eth, Zurich)

Kolkata_ICHEPAP_SAHA_Institute_December2023_MKM_nobcp.pdf

13:00 → 14:30 Lunch

Chair: Sunanda Banerjee

14:30 → 15:15 Current Status of Dark Matter (Theory)

Chair: B. Mukhopadhyay

Speaker: Alejandro Ibarra

Ibarra.pdf

15:15 → 16:00 Primordial Black Holes as Dark Matter Candidates

Chair: B. Mukhopadhyay

Speaker: Ranjan Laha (Indian Institute of Science)

ICHEPAP_2023.pdf

16:00 → 16:30 Tea Break

Chair: B. Mukhopadhyay

16:30 → 18:30 Parallel Session 1: Collider

Chair: Prolay Mal

16:30 Current status of Global W Mass Measurement

Chair: D. Kar/P. Mal

Speaker: Suvankar Roychowdhury (NFN Sezione di Pisa, Italy)

wmass_sinp_dec2023.pdf

17:00 Effective Field Theory in the light of LHC Data

Chair: Prolay Mal

Speaker: Rick Sandeepan Gupta (TIFR, Mumbai)

OOM_ICHEPAP.pdf

17:30 Application of Machine Learning Techniques in HEP experiments

Chair: D. Kar/P. Mal

Speaker: Sanmay Ganguly

ICHEPAP_2023_MLCOLLIDERS.pdf

18:00 Search for Dark Matter produced in association with a Higgs Boson in proton-proton collisions at √s = 13 TeV

Chair: D. Kar/P. Mal
Abstract: Search for Dark Matter produced in association with a Higgs boson in proton–proton collisions at s = 13 TeV Ashim Roy B.N. Mandal University E-mail: ashim.roy@cern.ch On behalf of CMS collaboration Abstract A search for dark matter (DM) particles was conducted by analyzing proton-proton collision data collected by the CMS experiment at a center-of-mass energy of 13TeV at the LHC in 2016. This dataset corresponded to an integrated luminosity of 35.9 fb-1. The search was centered around events with a candidate Higgs boson and a significant amount of missing transverse momentum. To maximize the analysis's sensitivity, the investigation was carried out in five distinct Higgs boson decay channels: h → bb, h → 𝛾𝛾, h → t+t-, h → W+W+, and h → ZZ. The results from each of these individual channels were carefully combined to enhance the sensitivity of the analysis. However, no substantial excess beyond the expected standard model background was detected in any of the above channels. As a result, the study proceeded to establish limits on dark matter production within the framework of two simplified models.

Speaker: Ashim Roy (Bhupendra Narayan Mandal University)

DarkMatterTalk_ICHEPAP_2023-12-11_v1.pptx

16:30 → 18:30 Parallel Session 1: Non Collider

Chair: D. Nieto

16:30 Particle Dark Matter

Chair: D. Nieto

Speaker: Satyanarayan Mukhopadhyay (IACS, Kolkata)

SMukhopadhyay_SINP_December_2023.pdf

17:00 Dark Matter in Compact Stars

Chair: D. Kerszberg

Speaker: Nirmal Raj (Indian Institute of Science)

Raj-ICHEPAP.pdf

17:30 CPT VIOLATION AND SAKHAROV CONDITIONS.

Chair: D. Nieto
Abstract: In this talk, we describe the impact of CPT violation on Sakharov conditions. Essentially the out-of-equilibrium condition will be modified in the presence of CPT violation since a tiny mass difference between particle and anti-particle will be naturally allowed when CPT violation is present.

Speaker: Biswajoy Brahmachari (Vidyasagar Metropolitan College)

brahmachari-ichepap-2023-revised.pdf

17:50 Seesaw determination of the dark matter relic density

Chair: D. Nieto
ABSTRACT: We show that in the usual type-I seesaw framework, augmented solely by a neutrino portal interaction, the dark matter relic density can be created through freeze-in, in a manner fully determined by the seesaw interactions and the DM particle mass. This simple freeze-in scenario, where dark matter is not in a seesaw state, proceeds through slow, seesaw-induced decays of Higgs W and Z bosons. We identify two scenarios, one of which predicts the existence of an observable neutrino line.

Speaker: Aritra Gupta (IFIC, Valencia, Spain)

Nportal.pdf

Tuesday, 12 December

09:30 → 10:15 Neutrinos from Supernovae

Chair: Naba Mondal

Speaker: Basudeb Dasgupta (TIFR, Mumbai)

ICHEPAP_BasuD_2023.pdf

10:15 → 11:00 Astrophysics with High Energy Neutrinos

Chair: Naba Mondal

Speaker: Albrecht Karle (University of Wisconsin–Madison)

11:00 → 11:30 Tea Break

11:30 → 12:15 The hunt for Pevatrons with gamma-ray observatories

Chair: Naba Mondal

Speaker: Pierre Cristofari (Observatory Paris, France)

12:15 → 13:15 Poster Session 1

Chair: Naba Mondal
Note: All the participants have to display their posters in every poster session. Please follow the scheduled timetable same as Poster Session 1.

12:15 Bounds on Ultralight Bosons from the Event Horizon Telescope observation of Sagittarius A*

Speaker: Abhishek Dubey (IISc, Bengaluru)

Abhishek_BHSuper_SINP.pdf

12:15 Cannibal dark matter decoupled from standard model: cosmological constraints

Abstract : We study the cosmology of an internally thermalized dark matter (DM), which is either coupled only gravitationally with the standard model (SM) sector, or may have a very feeble non-gravitational interaction that does not thermalize the two sectors. In the former scenario, the DM may undergo number-changing self-scatterings in the early Universe, eventually freezing out to the observed DM abundance. If these reactions, such as a 3 to 2 process, take place when the DM is non-relativistic, DM cannibalizes itself to cool much slower than standard non-relativistic matter during the cannibal phase. We find that depending upon the DM self-couplings, a scalar cannibal DM with mass in the range of around 80 eV to 700 TeV can make up the observed DM density and satisfy all the constraints, when the initial DM temperature (T_DM) is lower than the SM one (T_SM), with T_SM/9100<T_DM<T_SM/1.1. In the latter scenario, we further investigate the origin of the initial DM energy density in the Universe at the post-inflationary reheating epoch, and determine to what extent inflaton-mediated DM-SM scattering reactions can modify the temperature of the DM, thereby changing the initial conditions of DM temperature evolution during its non-relativistic phase. In each scenario, we evaluate the cosmological constraints from the cosmic-microwave background power spectrum, the big-bang nucleosynthesis limits on the relativistic degrees of freedom, the Lyman-alpha limits on the DM free-streaming length, and the Bullet Cluster constraints on DM elastic self-scatterings.

Speaker: Sourav Gope (IACS, Kolkata)

ICHEPAP_2023_poster.pdf

12:15 CMB signature of non-thermal Dark Matter

Abstract-The basic idea of this work is to achieve the observed relic density of a non-thermal dark matter(DM) and its connection with Cosmic Microwave Background (CMB) via additional relativistic degrees of freedom which are simultaneously generated during the period TBBN to TCMB from a long-lived dark sector particle.. To realize this phenomena we minimally extend the type-I seesaw scenario with a Dirac fermion singlet(χ) and a complex scalar singlet (φ) which transform non-trivially under an unbroken symmetry 3. χ being the lightest particle in the dark sector acts as a stable dark matter candidate while the next to lightest state φ operates like a long lived dark scalar particle. The initial density of φ can be thermally produced through either self-interacting number changing processes (3φ→2φ) within dark sector or the standard annihilation to SM particles (2φ→2 SM). The late time (after neutrino decoupling) non-thermal decay of φ can produce dark matter in association with active neutrinos. The presence of extra relativistic neutrino degrees of freedom at the time of CMB can have a significant impact on ΔNeff. Thus the precise measurement of ΔNeff by current PLANCK 2018 collaboration and future experiments like SPT-3G and CMB-S4 can indirectly probe this non-thermal dark matter scenario which is otherwise completely secluded due to its tiny coupling with the standard model.

Speaker: SK Jeesun (IACS, Kolkata)

12:15 Constraining NSIs through CEvNS measurements at the European Spallation Source

Abstract: The European Spallation Source (ESS), currently under construction in Sweden, will provide an intense pulsed neutrino flux allowing for high-statistics measurements of coherent elastic neutrino-nucleus scattering (CEvNS) with advanced nuclear recoil detectors. In this paper, we investigate in detail the possibility of constraining non-standard neutrino interactions (NSIs) through such precision CEνNS measurements at the ESS, considering the different proposed detection technologies, either alone or in combination. We first study the sensitivity to neutral-current NSI parameters that each detector can reach in 3 years of data taking. We then show that operating two detectors simultaneously can significantly improve the expected sensitivity on flavor-diagonal NSI parameters. Combining the results of two detectors turns out to be even more useful when two NSI parameters are assumed to be nonvanishing at a time. In this case, suitably chosen detector combinations can reduce the degeneracies between some pairs of NSI parameters to a small region of the parameter space.

Speaker: Sabyasachi Chatterjee (Karlsruhe Institute of Technology)

12:15 Cosmic inflation and Muon (g−2) in minimal gauged $L_\mu − L_\tau$ mode

Abstract: The minimal $U(1)_{L_\mu-L_\tau}$ gauge symmetry extended Standard Model (SM) is a well motivated framework that resolves the discrepancy between the theoretical prediction and experimental observation of muon anomalous magnetic moment. We envisage the possibility of identifying the beyond Standard Model Higgs of $U(1)_{L_\mu-L_\tau}$ sector, non-minimally coupled to gravity, as the inflaton in the early universe, while being consistent with the $(g-2)_\mu$ data. Although the structure seems to be trivial, we observe that taking into consideration of a complete cosmological history starting from inflation through the reheating phase to late-time epoch along with existing constraints on $U(1)_{L_\mu-L_\tau}$ model parameters leave us a small window of allowed reheating temperature. This further results into restriction of $(n_s-r)$ plane which is far severe than the one in a generic non-minimal quartic inflationary set up.

Speaker: Arnab Paul (IACS, Kolkata)

12:15 Effect of co-annihilation on Big Bang Nucleosynthesis

Abstract : The light matter abundance of our universe is sensitive to the neutron-to-proton ratio in the cosmic soup during the first phase of BBN. We consider a generic exotic particle species which co-annihilates with nucleons potentially modifying the neutron-to-proton ratio, thereby affecting the BBN predictions. In particular, the thermal freeze-out of the particle species via the co-annihilation controls the neutron freeze-out dynamics. We find that when the mass of the particle is comparable with the nucleon mass, the co-annihilation strength can be greater than the weak interaction strength without altering the BBN predictions.

Speaker: Deep Ghosh (IISER, Kolkata)

12:15 Exploring axions through the photon ring of a spherically symmetric black hole

Abstract: Axion is a pseudo-Nambu-Goldstone boson of U(1) Peccei-Quinn symmetry breaking introduced to solve the strong CP problem in Quantum Chromodynamics. Axion and axion-like particles possess certain properties that allow these particles to convert into photons when traversing through a magnetic field, making it feasible to probe them both in laboratory settings and in astrophysical environments. In this talk, I will discuss the phenomenon of photon-axion conversion occurring in the spacetime surrounding a black hole. Observations of the black hole in the center of the M87 galaxy (M87) through the Event Horizon Telescope imaged polarized synchrotron emission at 230 GHz on event horizon scales. Specifically, the potential existence of a magnetic field around M87 could facilitate the conversion of photons into axions in close proximity to the black hole photon sphere. The unstable photon orbits around the photon sphere will generate a bright ring-like structure. The conversion of photons to axions reduces the number of photons escaping the photon sphere, resulting in a dimming effect on the bright ring. We propose the possibility of detecting these axions through high-resolution telescopes. This study focuses on the mechanism considering the black hole to be non-rotating and spherically symmetric. We also investigate the photon ring luminosities if the black hole possesses a charge parameter. Apart from U(1) electric charge, the presence of an extra dimension may induce a tidal charge with a characteristic signature. The modified luminosity of the black hole's photon ring offers a valuable means of constraining the axion's coupling and mass parameter. Thus, our findings contribute to a better understanding of photon-axion conversion in the environment of a black hole spacetime and help us explore the possible existence of extra spatial dimensions.

Speaker: Pratick Sarkar (IACS, Kolkata)

sinp_pratick.pdf

12:15 Exploring Sub-GeV Dark Matter Boosted by Diffuse Supernova Neutrino Background: Insights from XENONnT and LUX-ZEPLIN Experiments

Abstract: In recent years, there has been a growing interest in the direct detection of sub-GeV dark matter, which is theoretically well-motivated. However, probing sub-GeV cold dark matter particles has posed a persistent challenge, as their typical momenta are insufficient to induce recoils above the thresholds of conventional direct detection experiments. Notably, even very strongly interacting dark matter within this mass range has been suggested to elude all observational bounds. However, recent studies have unveiled a novel approach to explore this elusive realm, wherein dark matter particles, typically non-relativistic, acquire semi-relativistic velocities. Here, we focus on the specific case of dark matter boosting through its interactions with the diffuse supernova neutrino background in the galaxy. This mechanism introduces a high-energy dark matter component capable of interacting with both electrons and nuclei in the detector, triggering a detectable recoil signal. Our study meticulously analyzes data from the XENONnT and LUX-ZEPLIN (LZ) experiments, culminating in the derivation of robust constraints on the scattering cross sections of sub-GeV boosted dark matter with both electrons and nucleons. Additionally, we emphasize the imperative nature of considering Earth's attenuation effects for both electron and nuclei interactions, while also highlighting the substantial role played by finite nuclear size effects in the context of nuclear scattering. Lastly, we present a comparison of our findings with existing constraints, illuminating the complementarity and significance of the LZ and XENONnT data in probing the sub-GeV dark matter parameter space, thereby emphasizing their potential to unveil this enigmatic realm.

Speaker: Anirban Majumdar (IISER, Bhopal)

poster-anirban-majumdar.pdf

12:15 Freeze in of fermionic dark matter through flavon portal

Abstract: We investigate the phenomenology of a non-thermal dark matter (DM) candidate in the context of flavor models that explain the hierarchy in the masses and mixings of quarks and leptons via the Froggatt-Nielsen (FN) mechanism. We point out a natural stabilizing mechanism for the DM within this framework . Also a very small coupling for the dark matter interaction with the visible sector which is a characteristic of FIMP, is naturally generated here. We explore the allowed parameter space for this DM candidate from relic abundance by solving the relevant Boltzmann equations. We find that reproducing the correct relic density requires the DM mass to be in the range (100 − 300) keV for n = 7.5 and (3 − 10) MeV for n = 8.5 where n is the U (1) FN charge of the DM fermion.

Speaker: Nandini Das (IACS, Kolkata)

Freeze in of fermionic dark matter through flavon portal..pdf

12:15 Giant Molecular Clouds: The Epicentre of gamma-rays and neutrino Emission in the Milky Way

Abstract: Giant molecular clouds (GMCs) are massive, dense areas of gas (mostly hydrogen) and dust in the Interstellar Medium (ISM). They provide a thick target for the Cosmic Rays (CR) to interact and produce gamma-rays and neutrinos. As these particles are neutral they are unaffected by the galactic magnetic fields and can be used to probe the origins and nature of the CR particles. In our recent work, we have estimated the diffuse emission of gamma-ray and neutrino from the Galactic plane considering a large population of GMCs in the Milky Way (MW). We considered two cases of CR distribution in our calculation: (1) the locally observed CR flux interacts with all the GMCs and (2) a radially dependent CR flux. The calculated gamma-ray and neutrino fluxes of each GMC were also compared with the sensitivity of current and future-generation detectors to find some potential source candidates. The flux from all the GMCs then stacked together and compared with the flux observed with the Fermi-LAT and IceCube detector, yielding consistent results.

Speaker: Abhijit Roy (ARIES, Nainital)

Poster.pdf

12:15 In Search of Majorana Neutrinos

Speaker: Ibrahim Mirza (University of Tennessee, USA)

Poster-SINP.pdf

12:15 Measurement of energy correlators inside jets

Abstract: The investigation of jet production and the jet substructure in proton-proton collisions at the Large Hadron Collider holds great importance. They serve as vital tools for conducting precise tests of Quantum Chromodynamics, improving the understanding of proton structure, and also provides essential details to study physics beyond the Standard Model. Here, we present the latest jet measurements using data from the Compact Muon Solenoid, from which the strong coupling constant is derived.

Speaker: Soumyadip Barman (Visva-Bharati University, Shantiniketan)

poster_EnergyCorrelators.pdf

12:15 Missing energy in rare B-decays in the light of GeV scale dark matter

Abstract- Belle-II has reported a 2.8 sigma deviation from standard model prediction in the branching ratio of B+ → K+ +inv decay mode. We enlighten this missing energy using a GeV scale scalar dark matter in an anomaly-free U (1)B−L framework. The new vector and scalar bosons coming from the gauge extension act as mediators for dark matter by providing annihilation channels and also participate in b → s transition through one loop penguin diagrams. We constrain the new parameters by using consistency with existing bounds on B → K∗ν ̄ν branching ratio performed at the Belle II experiment and from Dark matter relic density, direct detection, and collider. We analyse couplings between the mediator and the SM fermions as well as the dark matter particle. We then investigate the b → sν ̄ν decay modes such as B → (K+, K∗)ν ̄ν, Bs → (η, η′)ν ̄ν,Bs → φν ̄ν and Bc → (Ds, D∗ s )ν ̄ν in a common parameter space, meeting the current experimental bounds of both sectors simultaneously.

Speaker: Ajay Kumar Yadav (Central University of Karnataka)

12:15 ML-Based Top Taggers: Performance, Uncertainty and Impact of Tower & Tracker Data Integration

Abstract : Machine learning algorithms have the capacity to discern intricate features directly from raw data. We demonstrated the performance of top taggers built upon three machine learning architectures: a BDT that uses jet-level variables (high-level features, HLF) as input, while a CNN (miniature version of ResNet) trained on the jet image, and a GNN (LorentzNet) trained on the particle cloud representation of a jet utilizing the 4-momentum (low-level features, LLF) of the jet constituents as input. We found significant performance enhancement for all three classes of classifiers when trained on combined data from calorimeter towers and tracker detectors. The high resolution of the tracking data not only improved the classifier performance in the high transverse momentum region, but the information about the distribution and composition of charged and neutral constituents of the fat jets and subjets helped identify the quark/gluon origin of sub-jets and hence enhances top tagging efficiency. The LLF-based classifiers, such as CNN and GNN, exhibit significantly better performance when compared to HLF-based classifiers like BDT, especially in the high transverse momentum region. Nevertheless, the LLF-based classifiers trained on constituents' 4-momentum data exhibit substantial dependency on the jet modeling within Monte Carlo generators. The composite classifiers, formed by stacking a BDT on top of a GNN/CNN, not only enhance the performance of LLF-based classifiers but also mitigate the uncertainties stemming from the showering and hadronization model of the event generator. We have conducted a comprehensive study on the influence of the fat jet's reconstruction and labeling procedure on the efficiency of the classifiers.

Speaker: Rameswar Sahu (IOP, Bhubaneshwar)

ram.pdf

12:15 N2 Leptogenesis in presence of a Pseudo Dark Matter

Abstract:We study the N2 Leptogenesis in the presence of an extra complex singlet scalar field under U (1) symmetry extension. The VEV of the new scalar spontaneously breaks the U (1) symmetry. A remnant CP-like Z2 symmetry stabilizes the imaginary part of the complex scalar field as a Pseudo-Goldstone DM. The additional scalar which couples to RHN opens up new decay channels which can lead to a larger CP- violation in generating the lepton asymmetry.

Speaker: Nimmala Narendra (IACS, Kolkata)

12:15 Neutrino mass and leptogenesis in a hybrid seesaw model with a spontaneously broken CP

Abstract: We introduce a novel hybrid framework combining type I and type II seesaw models for neutrino mass where a complex vacuum expectation value of a singlet scalar field breaks CP spontaneously. Using pragmatic organizing symmetries we demonstrate that such a model can simultaneously explain the neutrino oscillation data and generate observed baryon asymmetry through leptogenesis. Interestingly, natural choice of parameters leads to a mixed leptogenesis scenario driven by nearly degenerate scalar triplet and right handed singlet neutrino fields for which we present a detailed quantitative analysis.

Speaker: Rohan Pramanick (IIT, Kharagpur)

Rohan_Poster_ICHEPAP23.pdf

12:15 Neutrinos from the Sun can discover dark matter-electron scattering

Speaker: Akash Kumar Saha (IISc, Bengaluru)

Poster_Sun.pdf

12:15 Precise probing and discrimination of third-generation scalar leptoquarks.

Abstract: We explore the pair production of third-generation scalar leptoquark at the Large Hadron Collider to next-to-leading order accuracy in QCD, matched to parton shower for a precise probing of the stemming model. We propose to tag two boosted top-like fatjets produced from the decay of heavy leptoquarks in association with notably large missing transverse momentum and consider them as the potential signal. Such a signal demonstrates the capability of a robust discovery prospect in the multivariate analysis with different high-level observables, including jet substructure variables. Various scalar leptoquark models predict different chirality of the top quark appearing from the decay of the leptoquark carrying same electromagnetic charge. We make use of the polarization variables sensitive to the top quark polarization in order to identify the underlying theory.

Speaker: Anupam Ghosh (PRL, Ahmedabad)

Anupam_SINP.pdf

12:15 Review and partial combination of searches for vector-like quarks

The LHC has yielded an unprecedented volume of data from 2016 to 2018, presenting a unique opportunity to investigate fundamental questions in particle physics. This involves probing rare processes beyond the standard model and testing the standard model's limits with greater precision, potentially leading to the discovery of new physics. To leverage this data fully, novel methods are necessary to explore new phenomena and optimize detector performance. Particularly, the focus is on exploring fermions within a wide mass range, as they have the potential to explain various phenomena within the standard model. This poster discusses the CMS experiment's efforts in searching for vector-like quarks, emphasizing the exploration of different possible final states and the prospects for discovering these particles at the high-luminosity LHC.

Speaker: Kuldeep Kumar Pal (NISER Bhubneswar)

kpal_ichepap_poster_v2.pdf

12:15 Search for dark matter produced in association with a Higgs boson decaying to two taus and missing transverse momentum by using CMS data at √s = 13 TeV

Abstract: The undetected dark matter search is performed in the final state of Higgs decaying to a pair of tau leptons with large missing transverse momentum (MET) by using the proton-proton collision data of CMS detector at CERN LHC, at the center of mass, √S=13 TeV. The benchmark models for this particular search are performed with two simplified models of DM + H productions. The first one is Z´–two–Higgs-Doublet(Z´-2HDM) model, where Z´ will decay into a standard model like Higgs boson and an intermediate heavy pseudo-scalar particle (A), which further decays into a Dirac fermionic dark matter particle. In this model, the mass of pseudo-scalar, A = 300 GeV and DM mass = 100 GeV, the Z' masses from 550 GeV to 1265 GeV are excluded. The second model, is Z´ baryonic model, where a new massive vector mediator Z´ emits a Higgs boson, which further decays to a pair of Dirac fermionic DM particles. In this model, the dark matter mass up to 1 GeV and Z' masses up to 615 GeV are excluded.

Speaker: Bisnupriya Sahu (University of Hyderabad, India)

12:15 The First Search for High-Energy Neutrino Emission from Galaxy Mergers

Speaker: Subhodip Bouri (IISc, Bengaluru)

12:15 The Hunt for Non-Resonant Signals of Axion-Like Particles at the LHC

Abstract : We will discuss an Effective Field Theory which extends the SM by an Axion-Like Particle (ALP) and mainly focus on the interactions of a light ALP to heavy SM particles. The talk is dedicated to the role of the LHC in probing ALP couplings particularly with the Higgs boson and the gauge bosons. We discuss a recent proposal to hunt for ALP signals in the non-resonant regime, i.e. when the ALP is kinematically too light to be on-shell. We use high-energy LHC probes for this, and examine the Higgs-strahlung process and the production of the diboson and triboson final states. Working in a gauge-invariant framework, we obtain the upper limits on ALP couplings to the Higgs boson and the electroweak bosons from the reinterpretation of latest LHC Run II data. The constraints inferred on ALP couplings are very competitive for ALP masses up to 100 GeV. Projections for HL-LHC will also be discussed, demonstrating the power of future dedicated analyses at ATLAS and CMS.

Speaker: Tisa Biswas (Calcutta University)

12:15 TIMING AND SPECTRAL ANALYSIS OF BLAZAR OJ 287: INVESTIGATING ITS POTENTIAL AS A HIGH-ENERGY NEUTRINO SOURCE

Abstract: We conducted a study on temporal and spectral analysis of observational data from OJ 287, which was observed from April 2005 to April 2020. We used a Chi-square minimization technique for spectral analysis. Among all observations most intense flaring was observed in April 2020 and flaring was observed in soft sub-bands 0.3-2 keV. The detected flaring was dominated by the thermal process. The best fit model was (log-parabola+blackbody). Both synchrotron and inverse Compton mechanisms contribute to the generation of X-ray emissions. The observations interpreted as being driven by the inverse Compton emission mechanism typically exhibit a lower energy flux in soft sub-bands and a higher energy flux in hard sub-bands. Both the May 2015 and April 2020 observations exhibit a pattern where their energy flux values are higher in soft sub-bands and lower in hard sub-bands. This pattern indicates that in these two observations, the emission is likely influenced by the synchrotron emission mechanism. The observation of synchrotron and inverse Compton emission mechanisms suggests that the astrophysical processes occurring within the source OJ 287 involve internal shocks and give rise to gamma-ray bursts There is no possibility of emission of high energy neutrinos from OJ 287 because flaring takes place due to thermal process in soft sub-bands.

Speaker: Rajendra Neupane (Central Department of Physics, Kirtipur, Kathmandu, Nepal)

ICHEPAP2023_Poster_Presentation_Rajendra_Neupane_CDP_Nepal.pdf

13:15 → 14:30 Lunch

14:30 → 16:30 Parallel Session 2: Collider

Chair: Bhubanjyoti Bhattacharya

14:30 New Physics Searches using Novel Topologies

Speaker: Deepak Kar (University of Witwatersrand, South Africa)

Deepak kar.pdf

15:00 Lattice QCD study of exotic hadrons

Speaker: Nilmani Mathur (Tata Institute of Fundamental Research, mumbai)

Ichep23_mathur.pdf

15:30 Unbiased exponential resummation in lattice QCD, a new way of exploring finite-density QCD

Abstract - A knowledge of the QCD equation of state is crucial not only for understanding the dynamics of relativistic heavy ion collision experiments, but also for knowing the young universe. One of the familiar ways to estimate this equation of state and understand QCD thermodynamics is through Taylor series of various thermodynamic observables. Recently, exponential resummation of this Taylor series has paved to be an important alternative approach of understanding the thermodynamics. Beginning from the estimate of the QCD partition function, this method is proposed for going around the otherwise expensive computations of higher order Taylor coefficients with reliable precision in lattice QCD. However, this resummation method gives biased estimates of different correlation functions which gives wrong results and thereby leads to incorrect interpretations of the thermodynamics in finite density QCD. We analyze these biased estimates order by order in chemical potential by applying cumulant expansion and compare the same with the Taylor series results in which, the calculations involve working with only the unbiased estimates of correlation functions. Although we find that this cumulant expansion eliminates stochastic bias and gives good agreement with Taylor series results order-by-order, we also find that this happens at the expense of the vital all-order resummation form of the partition function. We consequently present a new formalism of unbiased exponential resummation which provides a novel way of eliminating stochastic bias completely up to the desired order in chemical potential without losing the form of the all-order resummation. Thus, we find a new way of determining and approaching the otherwise true QCD equation of state.

Speaker: Sabarnya Mitra (Bielefeld University, Germany)

SINP_Talk_12_12_2023_Sabarnya_Mitra.pdf

15:50 Searches for heavy particles decaying to Higgs boson(s) in CMS experiment

Abstract: The CMS experiment at LHC has an extensive program to look for signatures of new physics to address several observed phenomena not explained by the standard model of particle physics. In this talk, I will review the recent CMS results on searches for a massive resonance decaying to final states involving one or more Higgs bosons. In this scope, I will highlight some exciting excesses of events observed in a few searches and mention the expected physics reach in the high-luminosity phase of LHC.

Speaker: Suman Chatterjee (Austrian Academy of Sciences)

XtoYH_Talk_SINP.pdf

16:10 Searching for top squarks from the landscape at HL-LHC

Abstract: Supersymmetric models with low electroweak fine-tuning are more prevalent on the string landscape than fine-tuned models. We assume a fertile patch of landscape vacua containing the minimal supersymmetric standard model (MSSM) as a low-energy EFT. Such models are characterized by light higgsinos in the mass range of a few hundred GeV whilst top squarks are in the 1-2.5 TeV range. Other sparticles are generally beyond current LHC reach. We evaluate prospects for top squark searches of the expected natural SUSY at HL-LHC.

Speaker: Juhi Dutta (University of Oklahoma)

ICHEPAP_JuhiDutta (1).pdf

14:30 → 16:30 Parallel Session 2: Non-collider

Chair: D. Kerszberg

14:30 GRAPES-III experiments at Ooty

Speaker: Pravata Mohanty

pravata_ichepap2023.pdf

15:00 Recent results from the AMS Experiment

Speaker: Jorge Casaus

Jorge Casaus - ICHEPAP2023.pdf

15:30 Applications of Machine Learning in Astroparticle Physics

Speaker: Daniel Nieto Castano (UCM, Madrid)

DNieto_ICHEPAP-dec23.pdf

16:00 Machine Learning in Theoretical High Energy Physics

Speaker: Partha Konar (PRL, Ahmedabad)

0SINP_Dec23.pdf

16:30 → 17:00 Tea

Wednesday, 13 December

09:30 → 10:15 Dark Matter Searches using Indirect Detection techniques

Chair: Basudeb Dasgupta

Speaker: Daniel Kerszberg (Institut de Fisica d'Altes Energies (IFAE))

ICHEPAP_Kolkata_13122023_Kerszberg.pdf

10:15 → 11:00 Dark matter searches using direct detection techniques and their future prospects

Chair: Basudeb Dasgupta

Speaker: Shawn Westerdale (University of California, Riverside)

westerdale_ichepap23.pdf

11:00 → 11:30 Tea

11:30 → 12:15 Recent Results and Future Plans from Neutrinoless Double Beta Decay Experiments

Chair: Basudeb Dasgupta

Speaker: Krishna Kumar (University of Massachusetts, Amherst)

12:15 → 13:15 Poster Session 2

Chair: Basudeb Dasgupta
Note: All the participants have to display their posters in every poster session. Please follow the scheduled timetable same as Poster Session 1.

13:15 → 14:30 Lunch

14:30 → 15:15 Recent Results from Belle-II and LHCb experiments

Chair: James Beacham

Speaker: Biplab Dey (Eotvos University., Dept. Atomic Phys. Hungary)

biplab.pdf

15:15 → 16:00 Some interesting directions in Flavor Physics

Chair: James Beacham

Speaker: Alakabha Datta (University of Mississippi, USA)

ICHEPAP_Alakabha.pdf

16:00 → 16:30 Tea

16:30 → 18:30 Parallel Session 3: Collider

Chair: Manimala Mitra

16:30 Dark Matter Searches at the Belle-II Experiment

Speaker: Minakshi Nayak (IISC, Bengaluru)

ICHEPAP_2023_nayak.pdf

17:00 Select puzzles in hadronic B meson decays

Speaker: Bhubanjyoti Bhattacharya (Lawrence Technological University)

ICHEPAP_2023_BB.pdf

17:30 Theory and Phenomenology of Axion & Axion Like Particles

Speaker: Sabyasachi Chakraborty (Indian Institute of Technology, Kanpur)

ICHEPAP_sabya.pdf

18:00 Search for a heavy neutral lepton that mixes predominantly with the tau neutrino

We report a search for a heavy neutral lepton (HNL) that mixes
predominantly with ντ . The search utilizes data collected with the
Belle detector at the KEKB asymmetric energy e+e− collider. The data
sample was collected at and just below the center-of-mass energies of the
Υ(4S) and Υ (5S) resonances and has an integrated luminosity of 915 fb−1,
corresponding to (836 ± 12) × 106 e+e− → τ+τ− events. We search for the
production of the HNL (denoted N) in the decay τ− → π−N followed by its
decay via N → μ+μ−ντ. The search focuses on the parameter-space region
in which the HNL is long-lived so that the μ+μ− originate from a common
vertex that is significantly displaced from the collision point of the
KEKB
beams. Consistent with the expected background yield, one event is
observed
in the data sample after the application of all the event-selection
criteria. We report limits on the mixing parameter of the HNL with
the τ neutrino
as a function of the HNL mass.

Speaker: Sourav Dey

SINP_2023_sourav.pdf

16:30 → 18:30 Parallel Session 3: Non-collider

Chair: Jorge Casaus

16:30 Dark Matter searches at neutrino telescopes

Speaker: Mohamed Rameez (Tata Institute of Fundamental Research)

ICHEPAPDM.pdf

17:00 Solar Investigation of Multicomponent Dark Matter

Abstract: If multiple thermal weakly interacting massive particle (WIMP) dark matter candidates exist, then their capture and annihilation dynamics inside a massive star such as Sun could change from conventional method of study. With a simple correction to time evolution of dark matter (DM) number abundance inside the Sun for multiple dark matter candidates, significant changes in DM annihilation flux depending on annihilation, direct detection cross-section, internal conversion and their contribution to relic abundance are reported in present work.

Speaker: Amit Dutta Banik (Indian Statistical Institute, Kolkata)

SINP-ICHEPAP_amit.pdf

17:20 Neutrino fog for dark matter electron scattering

Abstract: Low-energy neutrinos can be a significant background in the search for dark matter (DM) through direct detection. In this context, we aim to quantify the sub-GeV DM-electron scattering parameter space where the neutrino background overshadows any potential DM signal. Because DM and neutrinos have distinct energy spectra, theoretically, they can be distinguished with substantial exposure. This suggests that neutrinos should not be viewed as a hard floor but as a challenging yet distinguishable background, creating what we refer to as the 'neutrino fog'. We define the boundary of this 'neutrino fog' as the 'neutrino floor'. Notably, some well-motivated regions of the DM parameter space exist below this 'neutrino floor'.

Speaker: Tarak Maity (Harish-Chandra Research Institute)

17:40 Coannihilation and scotogenic fermionic dark matter

Abstract: Though the Standard Model assumes the neutrinos to be massless, the phenomenon of neutrino oscillation shows that they have tiny but non-zero masses. Scotogenic models, in which neutrino masses are generated at one-loop level and remain tiny due to loop suppression, are very interesting in this regard. In this model, since the beyond Standard Model (BSM) particles entering inside the neutrino-mass-loop are assumed to be odd under $Z_2$ symmetry, they can be considered as dark matter depending on their mass hierarchy. We have examined the phenomenology of fermionic dark matter in the singlet-triplet scotogenic model, especially in light of fermion-fermion and fermion-scalar coannihilation. In our analysis, we have considered constraints arising stability and perturbativity, electroweak precision observables, collider searches, charged lepton flavour violation (cLFV), relic density and direct detection experiments of dark matter. We find that bounds from collider and/or cLFV disfavour light fermionic dark matter of mass below 60 GeV. We also notice that fermion-scalar coannihilation is necessary to obtain viable fermionic dark matter within the mass range of 60 GeV to 100 GeV, and beyond 100 GeV fermion-scalar and fermion-fermion coannihilation play complementary roles in different regions of parameter space.

Speaker: Anirban Karan (IFIC (CSIC – Universitat de València), Spain)

Anirban_ICHEPAP.pdf

19:00 → 22:00 Conference Dinner

Thursday, 14 December

09:30 → 10:15 Quantum Computation for High Energy Physics Experiments

Chair: A. Karle

Speaker: Stefano Giagu (INFN, Rome)

ichepap2023_stefanogiagu.pdf

10:15 → 11:00 Long Lived Particle Search (Theory)

Chair: A. Karle

Speaker: Biplob Bhattacharjee (IISc, Bengaluru)

SINP_LLP.pdf

11:00 → 11:30 Tea

11:30 → 12:15 Long Lived Particle Search (Experiment)

Chair: A. Karle

Speaker: James Beacham (Duke University / CERN, Switzerland)

Beacham_ICHEPAP_SINP_Kolkata_2023Dec14.pdf

12:15 → 13:15 Poster Session 3

Chair: Utpal Chattopadhyay
Note: All the participants have to display their posters in every poster session. Please follow the scheduled timetable same as Poster Session 1.

13:15 → 14:30 Lunch

14:30 → 15:15 Cerenkov Telescope Array: the next generation ground based gamma-ray observatory

Chair: Utpal Chattopadhyay

Speaker: Mitsunari Takahashi (ISEE, Nagoya University)

15:15 → 16:00 Highlights from Heavy Ion Physics experiments

Chair : Utpal Chattopadhyay

Speaker: Subhasis Chattopadhyay (VECC, Kolkata)

16:00 → 16:30 Tea

16:30 → 18:50 Parallel Session 4: Collider

Chair: Biplob Bhattacharjee

16:30 Exotc Searches at the LHC

Speaker: Shilpi Jain (TIFR, Mumbai)

exoticSearchesLHC_v0.pdf

17:00 Dark matter searches at CMS experiment

Speaker: Bhawna Gomber (University of Hyderabad)

ICHEPAP23-Bhawna_Gombar.pdf

17:30 What LHC is telling us about paradigms of Physics beyond SM

Speaker: Kirtiman Ghosh (Institute of Physics, Bhubaneswar)

Kirtiman_SINP.pdf

18:00 Searches for New Physics with Low Mass Mediators at the LHC

Speaker: Swagata Mukherjee (Indian Institute of Technology, Kanpur)

SINP_swagata_2023.pdf

18:30 [Absent] Connecting dark matter and lepton flavour violation in a flavor symmetric Scot-seesaw model.

Abstract: We have consider a model by combining type I seesaw and scotogenic part. We have fitted neutrino mass and mixing from the neutrino oscillation data. As the sctogenic model has dark Z_2 symmetry, we have studied the fermionic dark matter phenomenology in detail. As neutrino mass generation allows lepton flavor to be violated, lepton flavor violating decays put a strong constraint on our model parameters. As a collider phenomenology, we have done an analysis on the signal stregth of higgs to $$h\to \gamma\gamma decay which also put some constrain on the mass of the charged Higgs scalar.

Speaker: Joy Ganguly (University of Engineering and Management Kolkata)

16:30 → 18:30 Parallel Session 4: Non-collider

Chair: Ranjan Laha

16:30 Status and recent results of the XENONnT experiment

Speaker: Sayan Ghosh (Purdue University)

Presentation_SayanGhosh.pptx

17:00 JUSL

Speaker: Mala Das (Saha Institute of Nuclear Physics, Kolkata)

17:30 Current status of the light neutralino thermal dark matter in the phenomenological MSSM

Abstract: We explore the parameter space of the phenomenological Minimal Supersymmetric Standard Model (pMSSM) with a light neutralino thermal dark matter (m_{DM}≤m_{Higgs boson}/2) that is consistent with current collider and astrophysical constraints. We consider both positive and negative values of the higgsino mass parameter (μ). Our investigation shows that the recent experimental results from the LHC as well as from direct detection searches for dark matter by the LUX-ZEPLIN (LZ) collaboration rule out the Z-funnel region for the μ>0 scenario. The same results severely restrict the h-funnel region for positive μ, however, the allowed points can be probed easily with few more days of data from the LZ experiment. In the μ<0 scenario, we find that very light higgsinos in both the Z and h funnels might survive the present constraints from the electroweakino searches at the LHC, and dedicated efforts from experimental collaborations are necessary to make conclusive statements about their present status. We also study the impact of light stau sleptons on this parameter space.

Speaker: Rhitaja Sengupta (BCTP and Physikalisches Institut der Universität Bonn, Germany)

ICHEPAP_rhitaja.pdf

Friday, 15 December

09:30 → 10:15 Physics Prospects in Future DM Experiments

Chair: A. Ibarra

Speaker: Nicole Bell (University of Melbourne)

ICHEPAP_2023_Bell.pdf

10:15 → 11:00 Physics prospects in Future Collider Experiments

Chair: A.Ibarra

Speaker: Michelangelo Mangano

Mangano_Calcutta.pdf

11:00 → 11:30 Tea

11:30 → 13:00 Parallel Session 4: Collider

Chair: Swagata Mukherjee

11:30 Particle physics potentials at Polarised Beam colliders

Speaker: Ritesh Singh (IISER, Kolkata)

RiteshSingh_ICHEPAP2023.pdf

12:00 The upgrade of the CMS electromagnetic calorimeter: future prospects for precision timing and energy measurements at the High Luminosity LHC

Speaker: Shubhi Parolia (University Di Pisa)

The upgrade of the CMS Electromagnetic calorimeter for the HL-LHC and the validation of its performance in beam tests.-2.pdf

12:20 Multi-Component Dark Matter: Identifying at Collider

Chair: Swagata Mukherjee

In this talk, I will demonstrate how having two WIMPs, each with different masses, and mass splitting with the NLSP, generated at a collider through a decay chain, can result in double peaks in the missing energy or missing transverse momentum distribution of the multilepton signal. I will also outline a set of criteria to identify and segregate the second peak in the missing energy spectrum, after a careful analysis of the corresponding Standard Model background contribution. (Ref. JHEP 12 (2022) 049 with Subhaditya Bhattacharya, Jayita Lahiri and Biswarup Mukhopadhyaya)

Speaker: Purusottam Ghosh (IACS, Kolkata)

PGhosh_SINP.pdf

11:30 → 13:00 Parallel Session 4: Non-collider

Chair: Mohd Rameez

11:30 Cosmic rays/gamma rays from GRBs

Speaker: Jagdish Joshi

GRB_GeVTeV_ICHEAP.pdf

12:00 Status of the MACE gamma-ray observatory

Online Talk

Speaker: Chinmay Borwankar (BARC, Mumbai)

12:30 Pseudo-Dirac Neutrinos and Flavor Ratios at Icecube

The phenomena of neutrino oscillations indicate that neutrinos have nonzero masses. Since then it has prompted immense interest to find out the source of production of neutrino-mass. Neutrino mass can be either Dirac or Majorana in nature. One intermediate way is to consider tiny Majorana masses as compared to the Dirac mass terms. In this particular scenario, neutrinos are called Pseudo-Dirac, basically, neutrinos are effectively Dirac fermions with very small Majorana masses.
these tiny masses induce active-sterile neutrino oscillations with almost maximal mixing along with the traditional flavor oscillations. In other words, this possibility can extend the Standard Model (SM) to include three additional sterile
eutrinos with the active ones. Since this effect is supposed to be of very small order, it can be observable through high-energy astrophysical neutrinos traveling long distances. We discuss here the different conditions that can be visible in flavor ratios due to oscillations induced by active-sterile oscillations for pseudo-Dirac neutrinos. We also provide the constraints on mass-squared differences driving these oscillations using IceCube data.

Speaker: Khushboo Dixit (University of Johannesburg)

13:00 → 13:15 Vote of Thanks

Speaker: Pratik Majumdar (SINP, Kolkata)

13:15 → 14:30 Lunch and Goodbye