10th Asian Triangle Heavy-Ion Conference - ATHIC 2025

Session

Parallel A

15 Jan 2025, 09:00

49. Constraint on initial conditions from nonlinear causality

Tetsufumi Hirano (Sophia Univ.)

15/01/2025, 09:00

2. Initial State - pre-equilibrium dynamics, baryon stopping, intense electromagnetic field

Relativistic hydrodynamics has played a vital role in understanding the bulk and the transport properties of the deconfined nuclear matter, the quark gluon plasma, created in high-energy nuclear collision. It is often supposed that the local equilibrium is reached rapidly after the collisions and that the created matter starts to behave as a fluid with small viscous effects subsequently. It...

67. Neural network study of the impact of nuclear structures in heavy ion collisions

Mr Abhisek Saha (Peking University)

15/01/2025, 09:18

2. Initial State - pre-equilibrium dynamics, baryon stopping, intense electromagnetic field

Understanding the nuclear structure in heavy-ion collisions is essential, as it critically influences final state observables. However, characterizing the structure of heavy nuclei in high-energy collisions remains challenging. Current simulation methods for modeling final state events based on initial state data are highly reliant on model parameters, requiring extensive tuning and...

98. Study of first-order event plane correlated anisotropic flow in heavy-ion collisions at high baryon density region

SHARANG RAV SHARMA (IISER Tirupati)

15/01/2025, 09:31

2. Initial State - pre-equilibrium dynamics, baryon stopping, intense electromagnetic field

Anisotropic flow parameters $(v_{n})$ are important observables as they provide insight into the collective expansion and transport properties of the medium produced in relativistic heavy-ion collisions. Among these parameters, directed flow ($v_1$) describes the collective sideward motion of produced particles in heavy-ion collisions. It is an important probe to study the in-medium dynamics...

209. Electromagnetic field fluctuation and its correlation with the participant plane in Au + Au and isobaric collisions at $\sqrt{s_{NN}}=200$ GeV

SK NOOR ALAM (ALIGARH MUSLIM UNIVERSITY)

15/01/2025, 09:44

Intense transient electric (${\bf E}$) and magnetic (${\bf B}$) fields are produced in the high energy heavy-ion collisions. The electromagnetic fields produced in such high-energy heavy-ion collisions are proposed to give rise to a multitude of exciting phenomenon including the Chiral Magnetic Effect. We use a Monte Carlo (MC) Glauber model to calculate the electric and magnetic fields, more...

140. Extracting baryon initial condition and diffusion - a Bayesian approach

Dr. Nachiketa Sarkar (iiser berhampur)

15/01/2025, 09:51

5. Baryon rich QCD matter, nuclear astrophysics

Bayesian analysis is employed to extract significant parameters related to the baryon initial condition and dissipation in the hot and dense strongly interacting matter produced in relativistic heavy ion collisions eventually leading towards significant understanding of the properties of the baryon rich QCD matter.

128. On Transportation of Baryon Number in pp Collision at √s = 0.9 and 7 TeV

Prof. Buddhadeb Bhattacharjee (Gauhati University (IN))

15/01/2025, 09:58

5. Baryon rich QCD matter, nuclear astrophysics

The estimation of the anti-baryon to baryon ratio is considered to be a useful tool for studying baryon number transport in pp, pA and AA collisions. For this study, the PYTHIA8.3 event generator with various tunes is used to measure the $\bar{\Lambda}$/Λ ratio as a function of rapidity (y), transverse momentum (pT), and multiplicity within both ALICE and LHCb acceptances. The results obtained...

21. Multiparticle Cumulants to Constrain the Initial State in Xe-Xe and Pb-Pb Collisions in the CMS Experiment

Aryaa Dattamunsi (Indian Institute of Technology Madras (IN))

15/01/2025, 10:11

2. Initial State - pre-equilibrium dynamics, baryon stopping, intense electromagnetic field

Xenon (Xe) nuclei are deformed and have a non-zero quadrupole moment, whereas lead (Pb) nuclei are considered spherical in shape. The study of Xe-Xe collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_{_{\mathrm{NN}}}} = 5.44$ TeV opens up a window to study nuclear deformation at LHC. When compared to Pb-Pb collisions at $\sqrt{s_{_{\mathrm{NN}}}} = 5.36$ TeV, one can explore...

18. Status overview of Korean group activities for MTD Endcap Timing Layer development

Dong Ho Moon (Chonnam National University (KR))

15/01/2025, 11:00

9. Future experimental programs

During the High-Luminosity phase of the LHC (HL-LHC), the CMS experiment will be upgraded with a new MIP Timing Detector (MTD), which will provide precise time measurements for charged particles up to a pseudorapidity of |eta| = 3. This precise timing capability will help address the complex pile-up environment anticipated at HL-LHC, thereby extending the experiment's sensitivity to new...

211. Physics overview of CBM detector at FAIR

Supriya Das (Bose Institute (IN))

15/01/2025, 11:18

Physics overview of CBM detector at FAIR

11. Performance study of Gas Electron Multiplier chamber for future heavy ion experiment

SUBIR MANDAL (Bose Institute)

15/01/2025, 11:36

9. Future experimental programs

Gas Electron Multiplier (GEM) is a cutting edge Micro Pattern Gaseous detector (MPGD) technology suitable as tracking device in high rate Heavy-Ion (HI) experiments for their high rate handling capability and good spatial resolution. The performance studies including the detector efficiency, gain, energy resolution and also the long-term stability study under high radiation are the most...

74. Development of an ALPIDE telescope and its test results at PF-AR in KEK

Kyungrim Woo (Pusan National University (KR))

15/01/2025, 11:49

9. Future experimental programs

The ALICE collaboration at the LHC is preparing for the Inner Tracking System 3 (ITS3) upgrade during the Long Shutdown 3 period. A chip test setup, namely, a telescope, consisting of 6 ALPIDE chips aligned along the beam path, enables us to reconstruct beam particle tracks and investigate a DUT (Device Under Test) chip placed between the chip layers. The Korean ALICE TeleScope, named KATS,...

109. Development of Ultra-Thin LGADs with Enhanced Timing Capabilities and Radiation Hardness for Future Collider Applications

Mr Jaideep Kalani (Tata Institute of Fundamental Research (IN))

15/01/2025, 12:02

9. Future experimental programs

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\begin{document}

\title{Development of Ultra-Thin LGADs with Enhanced Timing Capabilities and Radiation Hardness for Future Collider Applications}
\author{Jaideep Kalani$^{1}$, Saptarshi Datta$^{2}$, Ganesh J. Tambave$^{2}$, Prabhakar Palni$^{1}$\
\small $^{1}$Indian Institute of Technology...

157. Optimising Gas Electron Multiplier for improved detector performance using ANSYS and Garfield++

poojan angiras

15/01/2025, 12:15

9. Future experimental programs

Micro-Pattern Gas Detectors (MPGDs) are a type of gaseous ioniza-
tion detector that use microelectronics. They are characterized by a very small gap between the anode and cathode electrodes, which are main-
tained at high voltage and are usually filled with gaseous medium. When
a high-energy particle interacts with the gas, it produces ions and electrons that are propelled in opposite...

214. Relativistic Hydrodynamics - A causality-stability perspective

Sukanya Mitra

15/01/2025, 14:10

Relativistic Hydrodynamics - A causality-stability perspective

80. Effects of collision dynamics on p$\phi$ femtoscopy

Kenshi Kuroki

15/01/2025, 14:28

8. New theoretical developments

Femtoscopy in high-energy nuclear collisions is a novel phenomenological tool to study low-energy hadron interactions, and active studies in the past decade have demonstrated its usefulness [1]. Thus, hadron interaction study via femtoscopy is now advancing to unravel less understood interactions, such as baryon-vector meson interactions. However, since existing studies have assumed simple...

33. Shear and bulk viscosity for a pure glue theory using an effective matrix model

Manas Debnath (National Institute of Science Education and Research, Bhubaneswar)

15/01/2025, 14:46

8. New theoretical developments

At nonzero temperatures, the deconfining phase transition can be analyzed using an effective matrix model to characterize the change in holonomy. The model includes gluons and two-dimensional ghost fields in the adjoint representation, or "Teens". As ghosts, the teen fields are responsible for the decrease of the pressure as $T \rightarrow T_d$, with $T_d$ the transition temperature for...

48. Chaos and thermalization in SU(2) gauge theory under in- and out-of-equilibrium conditions

SAYAK GUIN (The Institute of Mathematical Sciences, Chennai, India)

15/01/2025, 14:59

8. New theoretical developments

We measure the Lyapunov exponent in SU(2) gauge theory under both in and out-of-thermal equilibrium conditions to understand the chaotic nature of non-Abelian gauge theories and its implications. Very close to the deconfinement temperature $T_c$, we use the fact that $SU(2)$ gauge theory falls within the same universality class as a $Z_2$ scalar field theory and calculate the Lyapunov exponent...

77. Understanding properties of the Dirac eigenspectrum in QCD and approach to thermalization

Ravi Shanker (The Institute of Mathematical Sciences)

15/01/2025, 15:12

8. New theoretical developments

In this work, we study the localization properties of the eigenstates of non-Abelian SU(3) gauge theory both with and without dynamical quark flavors in a gauge invariant manner, using first-principles lattice gauge theory techniques. We use the eigenspectrum of a probe (overlap) Dirac operator to understand the properties of thermal gauge ensembles of 2+1 flavor QCD generated using domain...

23. Quantum Hall effect for quarks in chiral effective model

Dani Rose J Marattukalam (Indian Institute of Technology Bhilai)

15/01/2025, 15:25

5. Baryon rich QCD matter, nuclear astrophysics

A net baryon density up to 2-6 times the nuclear saturation density and high magnetic fields are expected in the reaction zone of upcoming CBM/NICA experiments. Such densities are also likely in the core of massive neutron stars, possibly with mixed quark-hadron phases. The chiral effective model, based on the principles of chiral symmetry breaking and broken scale invariance, is employed to...

222. Heavy quark potential in anisotropic medium

Arghya Mukherjee

15/01/2025, 15:32

In this work, the real part of the static potential of a heavy quark-antiquark system in an anisotropic plasma medium is studied. The collective dynamics of the plasma constituents is described using hard-loop perturbation theory. The distribution function of the medium is characterized by a general set of anisotropy parameters. We calculated the real part of the heavy quark potential...

220. Sensitivity of jets to initial stages

Dr Souvik Priyam Adhya (Institute of Physics of the Czech Academy of Sciences)

15/01/2025, 15:39

Sensitivity of jets to initial stages

87. Exploring Hyperon Properties in Dense Baryon Matter and Neutron Stars

Akash Kumar Jena (Berhampur University)

15/01/2025, 15:57

8. New theoretical developments

We examine the properties of hyperons (Λ, Σ, Ξ) in dense baryon matter and neutron stars using a modified relativistic Dirac formalism (MRDF). In this approach, the quark meson (σ, ω) couplings are derived self-consistently at the quark level, where quark confinement is modelled through a scalar-vector linear potential, and corrections are incorporated for centre-of-mass motion, one-gluon...

151. Enhanced $\psi^{\prime}$ yield and $\psi^{\prime}/(J/\psi)$ yield ratio, a signature of QGP formation in high multiplicity $p+p$ collisions

Ananta P. Mishra (NISER)

15/01/2025, 16:04

3. Hard probes - jets and electromagnetic probes, heavy flavor, quarkonia

Suppression in the yield of quarkonia (heavy quark-antiquark bound states) has been considered one of the important signatures of the formation of the thermalized deconfined partonic matter, also known as the Quark Gluon Plasma (QGP), in Relativistic Heavy Ion Collision Experiments (RHICE). Traditionally, the in-medium dissociation of quarkonium states has been presented by implicitly assuming...

158. On the convergence of the gradient expansion of the Boltzmann equation

Reghukrishnan Gangadharan

15/01/2025, 16:11

2. Initial State - pre-equilibrium dynamics, baryon stopping, intense electromagnetic field

When two heavy nuclei collide in relativistic heavy ion collisions, the resulting
system is initially in a non-equilibrium state. The evolution of the system
towards equilibrium can be studied by using the Boltzmann equation.
However, approximating the solution to the Boltzmann equation using a
gradient expansion leads to a divergent series. Using an integral solution to
the Boltzmann...

19. Understanding the hadronic phase with resonance studies with ALICE at LHC Energies

Sonali Padhan (IIT- Indian Institute of Technology (IN))

15/01/2025, 16:35

4. Collective dynamics - conserved charges, spin, vorticity, freezeout, afterburner

Hadronic resonances, with lifetimes comparable to the duration of the hadronic phase, can be used as effective probes for studying its evolution in heavy-ion collisions. Exploring the dynamics of the hadronic phase reveals the roles of rescattering and regeneration in resonance production. In particular, rescattering reduces the resonance yields and may alter their transverse momentum, while...

107. Probing hadronic rescattering via $K^{*0}$ resonance production at RHIC

Mr Aswini Kumar Sahoo (Indian Institute of Science Education and Research, Berhampur)

15/01/2025, 16:48

5. Baryon rich QCD matter, nuclear astrophysics

Relativistic heavy-ion collisions provide a unique setting to investigate QCD matter under varied temperatures and densities. As the collision energy rises, the baryon chemical potential ($\mu_{B}$) decreases, resulting in a mid-rapidity region rich in baryons at the lower Beam Energy Scan (BES) program energies and in mesons at top RHIC energies. Short-lived resonances like $K^{*0}$ (lifetime...

62. Study of resonances flow and production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.36 TeV with ALICE

Sarjeeta Gami (National Institute of Science Education and Research (NISER) (IN))

15/01/2025, 16:55

4. Collective dynamics - conserved charges, spin, vorticity, freezeout, afterburner

Hadronic resonances play an important role in understanding the different phases of the evolution of relativistic heavy-ion collisions. Due to the short lifetime of resonances, their yields may be influenced by interactions in the final stage hadronic phase where rescattering can alter the momentum of the resonance decay products, preventing their reconstruction through invariant-mass...

114. Study of exotic resonances in pp collisions with ALICE at LHC

Mr Sawan Sawan (National Institute of Science Education and Research (NISER) (IN))

15/01/2025, 17:08

4. Collective dynamics - conserved charges, spin, vorticity, freezeout, afterburner

Quantum Chromodynamics (QCD) is a fundamental theory on which the Standard Model of particle physics is based, describing strong interactions between quarks and gluons. While conventional hadrons are composed of bound states of quark-antiquark ($q\bar{q}$) pairs or three-(anti)quark (qqq or $\bar{q}\bar{q}\bar{q}$) combinations, QCD also predicts exotic hadrons, such as $\mathrm{f_0(980)}$ and...

159. Data driven analysis of jet energy loss distribution in relativistic heavy ion collision

Riddhiman Roy (Indian Institute of Technology, Hyderabad)

15/01/2025, 17:21

3. Hard probes - jets and electromagnetic probes, heavy flavor, quarkonia

We present a numerical investigation of partonic energy loss in the Quark-Gluon Plasma (QGP) using a data-driven Bayesian inference framework. This study explores the energy, transverse momentum, and angular characteristics of the energy loss distribution associated with medium-induced multiple gluon emissions by hard partons traversing the QGP. The inference process employs the Markov Chain...

160. Study of charm fragmentation using charm-hadron angular correlation measurements with ALICE

Ravindra Singh (Universita e INFN, Padova (IT))

15/01/2025, 17:28

3. Hard probes - jets and electromagnetic probes, heavy flavor, quarkonia

In recent years, measurements of charm baryon-to-meson yield ratios highlighted a modification of the hadronization process in proton–proton collisions with respect to e+e− collisions. This invalidated the assumption at the basis of several theoretical calculations based on a factorisation approach that the cross section of charm hadrons can be calculated by parametrising the transition from...

27. Anisotropic Electrical Conductivity in Rotating Hadron Gas

4. Collective dynamics - conserved charges, spin, vorticity, freezeout, afterburner

In non-central heavy-ion collisions, substantial orbital angular momentum (OAM) is produced and transferred to the QGP and hadronic matter, leading to effects like spin polarization and the chiral vortical effect. Previous studies have explored the impact of OAM on electrical conductivity under a non-relativistic, globally rotating QGP. In this work, we have developed a relativistic framework,...

134. Strange hadrons production in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV from STAR

Sameer Aslam

1. QCD Phase Diagram, criticality and fluctuations

The main goal of the Beam Energy Scan (BES) program at RHIC is to search for and study key features in the QCD phase diagram such as the conjectured critical point, the expected first order phase transition between hadronic and partonic matter, and the chiral phase transition. Strangeness production is considered a sensitive probe of the early dynamics in the deconfined matter created during...