10th International Conference on New Frontiers in Physics (ICNFP 2021)

Session

B Heavy Ion Collisions and Critical Phenomena

26 Aug 2021, 11:00

Venue: OAC conference center, Kolymbari, Crete, Greece. Participation is possible also via internet.

252. In-medium effects in strangeness production in heavy-ion collisions at (sub-)threshold energies

Elena Bratkovskaya (GSI, Darmstadt)

26/08/2021, 11:00

Talk

We study the in-medium effects in strangeness production in heavy-ion collisions at (sub-)threshold energies of 1 - 2 A GeV based on the microscopic Parton-Hadron-String Dynamics (PHSD) transport approach. The in-medium modifications of the antikaon ($\bar K = K^-, \bar K^0$) properties are described via the self-consistent coupled-channel unitarized scheme based on a SU(3) chiral Lagrangian...

250. How clusters can survive in the expanding fireball in heavy ion collisions

Joerg Aichelin (Subatech/CNRS)

26/08/2021, 11:30

Talk

“Ice in fire” is called the phenomenon that in heavy ion collisions at midrapidity clusters have been observed. Their existence is unexpected because objects with a small binding energy (ice) with respect to the temperature of the expanding fireball (fire) should not be formed at all. Applying the recently advanced PHQMD model, which unites the n-body dynamics of nucleons with the collision...

38. Particle polarization in heavy-ion collisions at moderately relativistic energies

Yuri Ivanov (JINR)

27/08/2021, 11:00

Talk

Predictions for the global Λ polarization in Au+Au collisions in current and upcoming experiments at moderately relativistic energies, 2.4 ≤ √s_NN ≤ 12 GeV, are made. The simulations were performed within the model of the three-fluid dynamics with three different equations of state. It is predicted that the global polarization increases with the collision energy decrease. At √s_NN ≈ 3 GeV this...

102. Hadronic resonances in heavy-ion collisions at NICA energies and their reconstruction in the MPD setup

Viktor Riabov (NRC Kurchatov Institute PNPI (RU))

27/08/2021, 11:30

Talk

The short-lived hadronic resonances are used to study the properties of the hot and dense medium produced in relativistic heavy-ion collisions. The resonance lineshapes (masses and widths), yields and mean transverse momenta measured in the hadronic decay channels are sensitive to different stages of the nuclear collisions. Having different masses, strangeness content and baryonic numbers,...

103. Probing the properties of dense nuclear matter with photon conversions at NICA

Nazar Burmasov (NRC Kurchatov Institute PNPI (RU))

27/08/2021, 12:30

Talk

Photons serve as valuable probes of the properties of the hot and dense nuclear matter created in collisions of heavy ions. Thermal photon spectra at RHIC and LHC energies indicate that the temperature of the produced medium far exceeds the temperature of the phase transition to the quark-gluon plasma in lattice QCD calculations. Measurements of thermal photon spectra in heavy ion collisions...

216. Charged-particle multiplicity distribution of Heavy flavor decay leptons in proton-proton collisions using Pythia8 at LHC energies

Dr Tinku Sarkar - Sinha (Saha Institute of Nuclear Physics (IN))

27/08/2021, 13:00

Talk

Heavy quarks (i.e, charm and bottom) are produced at the very early stage of high energy nucleon-nucleon and heavy-ion collisions. These heavy quarks are produced mainly through initial hard parton-parton scattering with large momentum transfer (Q$^2$). In relativistic heavy-ion collisions, the heavy
quarks are produced much before the formation of deconfined medium consisting of quarks and...

191. Overview of Heavy Ion Results at LHCb

Prof. Valery Pugatch (Institute for Nuclear Research, National Academy of Sciences of Ukraine (UA))

30/08/2021, 08:30

Talk

\begin{document}
\title{Overview of Heavy Ion Results at LHCb}
\author{V. ~Pugatch on behalf of the LHCb Collaboration}
\affiliation{Institute for Nuclear Research \ Nat. Acad. of Sci. of Ukraine}
\address{47, Prospekt Nauki, Kyiv, 03680, Ukraine}
\email{pugatch@kinr.kiev.ua}%e-mail

Overview of recent results on heavy ion collisions explored in collider and fixed target mode in the...

12. Exploring cosmic matter with heavy-ion collisions

Peter Senger (GSI)

30/08/2021, 09:00

Talk

In heavy-ion collisions at intermediate energies, nuclear matter will be compressed to densities corresponding to the ones in the core of neutron stars. This opens the opportunity to explore the properties of strongly interacting matter in the laboratory, such as the high-density equation-of-state, which governs the structure of compact stellar objects, and the dynamics of neutron star...

44. Annual Modulation Results from DAMA/LIBRA

Dr Riccardo Cerulli (INFN - National Institute for Nuclear Physics)

30/08/2021, 09:30

Talk

The DAMA/LIBRA experiment (about 250 kg of highly radio-pure NaI(Tl)), is running deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N.; its main aim is the investigation of Dark Matter (DM) particles in the Galactic halo by pursuing the model independent DM annual modulation signature. The results released so far have been obtained with the data of the first phase of...

27. A model of dark photons as dark matter in a multi-temperature universe

Amin Abou Ibrahim (Institute for theoretical physics, Münster University)

30/08/2021, 10:00

Talk

The possibility of a dark photon in the sub-MeV mass range which has a kinetic mixing with the Standard Model to be a dark matter candidate is highly constrained due to the stringent limits from astrophysical experiments as well as $\Delta N_{\rm eff}$. We present a particle physics model comprising of two hidden sectors where one hidden sector has a direct kinetic mixing with the SM while the...

70. Collective modes in chiral anisotropic quark-gluon plasma

Margaret Carrington (Brandon University)

30/08/2021, 11:00

Talk

We study collective modes in chirally asymmetric and momentum-anisotropic quark-gluon plasma, using a kinetic theory approach which is valid in the quasi-particle regime. We introduce a general ansatz to describe the parton distribution functions, and decompose the polarization tensor in terms of nine independent components. We derive and solve the dispersion equations. We discuss the...

166. Study on production of ${\rm K}_{\rm S}^{0}$, $\Lambda$ ($\overline{\Lambda}$), $\Xi^{\pm}$ and $\Omega^{\pm}$ in jets and underlying events in pp and p--Pb collisions with ALICE

Pengyao Cui (Central China Normal University CCNU (CN))

30/08/2021, 11:00

Talk

Recent ALICE results on the yield of (multi-)strange particles in pp and p--Pb collisions reveal the possibility that similar strange quark production mechanisms could be present in all collision systems.
The $p_{\rm T}$-dependent baryon-to-meson yield ratio in hadronic and nuclear collisions is sensitive to the collective expansion of the system, the partonic recombination into hadrons, the...

45. Study of spectator distributions in the HADES experiment

Elisaveta Zherebtsova

30/08/2021, 11:25

Talk

To study physical observables in the HADES experiment, it is extremely important to have
a model that can describe the data well. Recently, the HADES experiment collected
collision data for Au+Au@1.23 AGeV and Ag+Ag@1.58AGeV. One of the important
subsystems of the setup is the forward hodoscope, which measures the spectators charge
(FWALL). The comparisons of the experimental charge...

94. Vorticity Effect in Heavy-ion Collision

Mr Anke Lei (Department of Physics, Wuhan University of Technology)

30/08/2021, 11:30

Talk

We calculated four types of vorticities in non-central Au+Au collision at energies $ \sqrt{S_{NN}} $ = 5--200 GeV within the microscopic transport model PACIAE. We find that the initial vorticities show clearly non-monotonic dependence on the collision energies, which is in accordance with a previous study. Our calculation shows that the turning point is around 10-15 GeV for different vorticities.

92. Search for the QCD critical point by the NA61/SHINE experiment

Haradhan Adhikary (Jan Kochanowski University (PL))

30/08/2021, 11:50

Talk

The existence and location of the QCD critical point is an object of both experimental and theoretical studies. One of the main goals of NA61/SHINE, a fixed-target experiment at the CERN SPS, is the search for the critical point of strongly interacting matter. The comprehensive data collected during a two-dimensional scan in beam momentum (13A-150A GeV/c) and system size (p+p, p+Pb, Be+Be,...

104. Nature of particles azimuthal anisotropy at low and high transverse momenta in ultrarelativistic A+A collisions

Gyulnara Eyyubova (M.V. Lomonosov Moscow State University (RU))

30/08/2021, 12:00

Talk

Abstract:
LHC data on the correlations of the elliptic flow of particles at low and high $p_T$ from Pb+Pb collisions at $√s_{NN}$= 5.02 TeV are analyzed in the framework of the HYDJET++ model. This model includes soft and hard components which allows to describe the region of both low and high transverse momenta. The origin of $v_2$ values in different $p_T$ regions is investigated at...

262. Validation of Glauber model in centrality determination for small systems

Niveditha Ramasubramanian (Stony Brook University)

30/08/2021, 12:15

Talk

The initial motivation to study d+Au collisions was to study the cold
nuclear matter effects and to use this as a control experiment to better
understand the experimental signatures of Quark Gluon Plasma (QGP) in
heavy ion collisions. From 2013, we have been observing unexpected results
indicating the formation of QGP even in small system collisions.
Suppression in the nuclear...

137. Overview of recent heavy flavor measurements from the STAR experiment

Mr Te-Chuan Huang (National Cheng Kung University)

30/08/2021, 12:30

Talk

Heavy quarks are mainly produced at the early stages of relativistic heavy-ion collisions before the formation of the quark-gluon plasma (QGP). Heavy quarks then experience the entire evolution of the QGP medium, and thus are ideal probes of the QGP properties. Measuring the open heavy flavor hadrons and their decayed electrons with different observables provides information for different...

217. Production of charged-particles in proton-proton and heavy-ion collisions using RIVET analysis

Md Samsul Islam (Saha Institute of Nuclear Physics (IN))

30/08/2021, 12:40

Talk

The study of phenomenology of the strong nuclear force (QCD) in High energy collisions of hadrons accessing the data from particle physics colliders is an ongoing research during last two decades. Different phenomenological models along with the event generators are used to reproduce experimental data.
There is confrontation of such model components and experimental data during its validation...

173. Decoupling the rates of Bottomonium dissociation and recombination reactions in heavy-ion collisions using Bateman equation

Abdulla Abdulsalam

30/08/2021, 13:00

Talk

The bottomonium states with their different binding energies and radii dissolve at different temperatures of the medium produced in relativistic heavy-ion collisions. Relative yields of bottomonium and their survival in the medium have the potential to map the properties of Quark-Gluon-Plasma (QGP). This is the FIRST study that the rate equations of dissociation and recombination are...

88. Nonequilibrium cumulants of the chiral order parameter and the net-proton number at lower RHIC energies

Christoph Herold (Suranaree University of Technology)

30/08/2021, 13:05

Talk

STAR’s beam energy scan program at RHIC provides data on net-proton number fluctuations with the goal to detect the QCD critical point and first-order phase transition. Interpreting these experimental signals requires a vital understanding of the interplay of critical phenomena and the nonequilibrium dynamics of the rapidly expanding fireball. We study these aspects with a fluid dynamic...

223. Scaling of kinematic and global observables, along with energy and entropy density in pp, pPb and PbPb collisions

Edgar Dominguez Rosas (Universidad Nacional Autonoma (MX))

30/08/2021, 17:00

Talk

We present a study of the average transverse momentum and multiplicity distributions using different Monte Carlo event generators. The sensitivity in these observables to the collective phenomena at the LHC and NICA energies is investigated. Besides, we explore the average transverse momentum as a function of the multiplicity scaled to the transverse collision area, the energy, and entropy...

31. Multi-partonic medium induced cascades in expanding media

Mr Souvik Priyam Adhya (Institute of Particle and Nuclear Physics Faculty of Mathematics and Physics, Charles University)

30/08/2021, 17:25

Talk

Going beyond the simplified gluonic cascades, we have introduced both gluon and quark degrees of freedom for partonic cascades inside the medium. We then solve the set of coupled evolution equations with splitting kernels calculated for static, exponentially expanding and Bjorken media to arrive at medium-modified parton spectra for quark and gluon initiated jets. For our calculations, we have...

81. Correlations generated by global baryon number conservation

Michał Barej (AGH University of Science and Technology, Krakow)

30/08/2021, 17:50

Talk

The search for the expected first-order phase transition between the hadronic matter and quark-gluon plasma and the corresponding critical endpoint is an active field of research. One of the main approaches to study this problem is based on fluctuations of e.g. net-baryon number, net-charge, or net-strangeness number measured in relativistic heavy-ion collisions. The cumulants are commonly...

106. Analytical solution of the generalized Boltzmann transport equation in the relaxation time approximation

Trambak Bhattacharyya

30/08/2021, 18:15

Talk

Conventional Boltzmann transport equation (BTE) has an exponential stationary solution. While studying the equilibrium distribution of the heavy quarks in the quark-gluon plasma using the Fokker-Planck equation (obtained from the conventional BTE), Rafelski and Walton in 2000 showed that this distribution is rather power-like. However, there exists a generalized Boltzmann transport equation...

85. Thermodynamic Behaviour of Time Dependent Magnetized Quark Gluon Plasma

Dr Yogesh Kumar (University of Delhi, India)

30/08/2021, 18:40

Talk

The current work is used to explore the structure of hot and dense system quark gluon plasma (QGP) in order to deal with the dynamics of quarks and gluons in magnetized field. Since a huge and intense magnetic field is expected to be produce at RHIC and LHC, we calculate the equation of states (EoS) in the presence of time dependent magnetic fields with the medium effects of quarks and gluons...

83. Measurements of open charm hadrons in Au+Au collisions at $\sqrt{s_\mathrm{NN}} = 200\:\textrm{GeV}$ by the STAR experiment

Jan Vaněk (Nuclear Physics Institute, Czech Academy of Sciences)

31/08/2021, 11:00

Talk

At RHIC energies, charm quarks are primarily produced in hard partonic scatterings at early stages of ultra-relativistic heavy-ion collisions. This makes them an ideal probe of the Quark-Gluon Plasma (QGP), as they experience the entire evolution of this hot and dense medium. STAR is able to measure the production of charm quarks and their interaction with the QGP through direct reconstruction...

219. Influence of chiral imbalance on color superconductivity phenomenon

Roman Zhokhov (IHEP)

31/08/2021, 11:30

Talk

Phase structure of quark matter with chiral and isospin imbalance is considered in the framework of effective models. There has been considered as two color as well as three color QCD. It was shown that chiral imbalance has several rather peculiar properties such as being universal catalyzer, i. e. it catalyzes all the considered symmetry breaking patterns in the system, including the diquark...

293. Tsallis statistics, thermofractals and QCD

Dr Eugenio Megias (University of Granada)

31/08/2021, 12:00

Talk

In this work, we study the non-extensive Tsallis statistics and its applications to QCD and high energy physics. In particular, we present recent investigations on the power-law distributions arising in high energy physics experiments focusing on a thermodynamic description of the system formed, based on Tsallis statistics which could explain this power-law behavior. The possible connections...

37. Upgrade of the BM@N detector for studies of heavy ion interactions

Anna Maksymchuk (Joint Institute for Nuclear Research (RU))

31/08/2021, 12:30

Talk

In the next years the BM@N experiment at the Nuclotron at JINR in Dubna will carry out the physics program with heavy ion beams with energies up to 3.8 AGeV and intensities up to $2$$\cdot$$10^6$ ions/s. The experiment is devoted to measure observables sensitive to the equation of state of dense baryonic matter. To meet this goal the existing BM@N set-up will be upgraded with fast hybrid...

240. Electrical and Hall Conductivities of a hot and magnetized pion gas in heavy ion collisions

Pallavi Kalikotay

31/08/2021, 13:00

Talk

The magnetic field and medium effects on electrical and hall conductivities of a hot and magnetized pion gas has been studied. The conductivities has been evaluated using kinetic theory approach in the ambit of relaxation time approximation. Thermal field theoretical techniques has been used to evaluate the dynamical input to these conductivities.

82. Gamma Gamma pairs production from hot and dense quark gluon plasma

Dr Yogesh Kumar (Deshbandhu College, University of Delhi)

31/08/2021, 17:00

Talk

We study one of the important indirect signature of quark gluon plasma as electromagnetic signals. This work is carried out using a phenomenology of heavy-ion collisions in the limit of high temperature and chemical potential. The gamma gamma production rate is shown for lowest order process incorporating quark mass in the presence of chemical potential. The results are plotted in the relevant...

133. New results from flow, chirality and vorticity at RHIC-STAR

Dr Chunjian Zhang (stony brook university)

31/08/2021, 17:30

Talk

Heavy-ion collisions quickly form a hot and dense phase of Quantum Chromodynamics (QCD) matter, so called the strongly interacting quark-gluon plasma (QGP). The QGP persists for only a much shorter time ($10^{-23}$s), then cools and translates into a lower temperature hadronic phase. Analyzing these final particles in a variety of different ways offers a unique insight into the properties of...

96. STAR results on strangeness and electric charge dependent splitting of the rapidity-odd directed flow

Ashik Ikbal Sheikh (Wigner Research Centre for Physics (Wigner RCP) (HU))

31/08/2021, 18:00

Talk

We report the first measurement of the rapidity-odd directed flow ($v_1$) of multi-strange baryons ($\Xi$ and $\Omega$) in Au+Au collisions as recorded by the STAR detector at the Relativistic Heavy Ion Collider.

We focus on particle species where all constituent quarks are produced, as opposed to possibly transported, and demonstrate using a novel analysis method that the coalescence sum...

152. Space-average electromagnetic fields and EM anomaly weighted by energy density in heavy-ion collisions

Irfan Siddique (USTC)

31/08/2021, 18:30

Talk

We study the space-average electromagnetic (EM) fields weighted by the energy density in the central regions of heavy ion collisions. These average quantities can serve as a barometer for the magnetic-field induced effects such as the magnetic effect, the chiral separation effect and the chiral magnetic wave. Comparing with the magnetic fields at the geometric center of the collision, the...

59. Triple nuclear collisions and new perspectives to explore the QCD matter properties under new extreme conditions

Kyrill Bugaev (Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine), Oleksandr Vitiuk (Taras Shevchenko National University of Kyiv)

01/09/2021, 11:00

Talk

Kyrill Bugaev$^{a, b}$, Oleksandr Vitiuk$^{c}$, Valery Pugatch$^{c}$, Vasyl Dobishuk$^{c}$, Sergiy Chernyshenko$^{c}$, Boris Grinyuk$^{b}$, Pavlo Panasiuk$^{a}$, Nazar Yakovenko$^{a}$, Elizaveta Zherebtsova$^{d}$, Larissa Bravina$^{e}$, Arkadiy Taranenko$^{d}$, Evgeny Zabrodin$^{e, f}$
and Marcus Bleicher$^{g}$

$^{a}$Department of Physics, Taras Shevchenko National University of Kyiv,...

87. An overview of recent STAR jet measurements and futurity

NIHAR RANJAN SAHOO (Shandong University)

01/09/2021, 11:30

Talk

Jets are produced in heavy-ion and nucleon-nucleon collisions from hard-scattered patrons of the incoming beams. We can infer the property of hot-dense QCD matter, known as Quark-Gluon Plasma (QGP), by studying the modified jet properties in heavy-ion collisions with respect to their vacuum reference. The STAR experiment has recently reported several novel jet measurements in heavy-ion...

276. Quarkonium production in p+p collisions at RHIC and LHC

Dr Leszek Kosarzewski (Czech Technical University in Prague)

01/09/2021, 12:00

Talk

Quarkonium states are good probes allowing to study the properties of quark-gluon plasma created in heavy ion-collisions. However, the production mechanism in p+p collisions is still an open question. It is often assumed that it factorizes into the hard scattering and non-perturbative hadronization. The basic quarkonium production models like Color Singlet, Color Octet and Color Evaporation...

313. Study of freeze-out, directed flow and vorticity in heavy-ion collisions at NICA energies

Larisa Bravina

01/09/2021, 12:30

Talk

108. Differential measurements of jet sub-structure observables and their correlation in p+p collisions at √s=200 GeV in STAR

Monika Robotková

01/09/2021, 13:00

Talk

Jets are collimated sprays of hadrons created by the fragmentation of high energy partons, and serve as an experimental tool for studying quantum chromodynamics. In particular, we can explore the properties of parton showers and jet evolution by measuring jet sub-structure. One of the techniques that allows experimental access to the parton shower is the jet grooming technique called SoftDrop....

167. Quantum fluctuation of energy and its pseudo-gauge dependence in subsystems of hot relativistic gas

Arpan Das (Institute of Nuclear Physics Polish Academy of Sciences Krakow )

01/09/2021, 17:00

Talk

We discuss the quantum fluctuations of energy in subsystems of hot relativistic gas for both scalar and spin half particles. For small subsystem sizes, we find a substantial increase of fluctuations compared to those known from standard thermodynamic considerations. However, if the size of the subsystem is sufficiently large, we reproduce the result for energy fluctuations in the canonical...

121. Confinement/deconfinement transition in rotating gluodynamics within lattice simulation

Dr Artem Roenko (JINR)

01/09/2021, 17:30

Talk

This report is devoted to the study of the influence of relativistic rotation on the confinement/deconfinement transition in SU(3) gluodynamics within lattice simulation. We perform the simulation in the reference frame which rotates with the system under investigation, where rotation is reduced to external gravitational field. To investigate the confinement/deconfinement transition the...

29. Study of the central exclusive production of $\pi^+\pi^-$, $K^+K^-$ and $p \bar{p}$ pairs in proton-proton collisions at $\sqrt{s} = 510$ GeV with the STAR detector at RHIC

Tomáš Truhlář

01/09/2021, 17:30

Talk

We report on the measurement of the central exclusive production process $pp \ \rightarrow \ pXp$ in proton-proton collisions at RHIC with the STAR detector at $\sqrt{\mathrm{s}} = 510$ GeV. At this energy, this process is dominated by a double Pomeron exchange mechanism. The tracks of the centrally produced system $X$ were reconstructed in the central detector of STAR, the Time Projection...

315. TBA

01/09/2021, 18:30

72. Intense Hadron Beams for Research into Heavy Ion Nuclear Physics

Boris Sharkov (JINR)

B Heavy Ion Collisions and Critical Phenomena

Talk

This presentation outlines ongoing activities on development of heavy ion accelerator facilities, providing high-brightness beams capable of generating intense beams of stable isotopes and radioactive ions. Manifested facilities goals is pushing the “intensity” and the “precision frontiers” to the extremes when accelerating full range of ion beam species from p+ to U to highest beam...