Final-state effects on J/ψ nuclear modification in A+A collisions have long been observed in heavy-ion physics at RHIC and LHC energies. Suppression of the $J/\psi$ nuclear modification factor has been considered a signature of quarkonia dissociation in large systems, where energy densities reach levels high enough to break bound $c\bar{c}$ states. However, suppression of the $J/\psi$ nuclear...
Through analytical arguments, numerical calculations and comparison with experimental data, we demonstrate that the ratio of high-$p_{\perp}$ observables $v_2/(1−R_{AA})$ reaches a well-defined saturation value at high $p_{\perp}$, which depends on the spatial anisotropy of quark-gluon plasma formed in ultrarelativistic heavy ion collisions. By using our recently developed DREENA framework,...
The fundamental and first two lowest-frequency excited modes of radial oscillation have been computed in the high nuclear density regime for a set of seven realistic equations of state (EoS) as functions of central energy density. Various types of zero-temperature EoS of cold nucleonic, hyperonic, and strange-quark matter models are used in the inner core to determine the internal structure in...
We perform the first study on asymmetric longitudinal decorrelations of elliptic, triangular and quadrangular flows in proton-nucleus collisions at the LHC and RHIC energies. To measure the longitudinal flow decorrelations for asymmetric collision systems, we propose a new set of rapidity-asymmetric flow decorrelation functions. Our event-by-event hydrodynamic calculations show that the flow...
We present the results of the axial-vector transition form factors of
singly heavy baryons within the framework of the chiral quark-soliton
model. The chiral quark-soliton model is a pion mean-field approach in
the large-$N_{c}$ limit, which deals with light and heavy baryon
on and equal footing. In the limit of the infinitely heavy mass of the
heavy quark, a singly heavy baryon can be...
At LHC energies it is possible to generate BSQ (baryon, strangeness, and electric) charge fluctuations from gluon splittings into quark anti-quark pairs, generated within the ICCING model. Here we propagate these conserved charges within an upgraded version of the hydrodynamic model, v-USPhydro, that conserves BSQ coupled to a 4-D equation of state {T,μB,μS,μQ} from Lattice Quantum...
The magnetic field seems to play a significant role in shaping and working the visible universe. It gives rise to a lot of non-trivial and anomalous behavior in the system in which they are present, extending from the effects seen in condensed matter physics in Dirac and Weyl semi-metals to large cosmological objects like in neutron stars or black holes. The strength of the magnetic field in...
We have studied the effects of weak magnetic field and finite chemical potential on the transport of charge and heat in hot QCD medium by determining their response functions, such as electrical conductivity ($\sigma_{\rm el}$), Hall conductivity ($\sigma_{\rm H}$), thermal conductivity ($\kappa_0$) and Hall-type thermal conductivity ($\kappa_1$) in kinetic theory approach at weak magnetic...
While the 3D charge distribution of the nucleon cannot be interpreted as quantum-mechanical probability densities in the Wigner sense, the 2D charge distribution of it has a completely probabilistic meaning. In this talk, we present how the Abel transformation map the 3D charge distribution in the Breit frame onto the 2D charge one in the infinite momentum frame.
Two-particle Bose-Einstein quantum-statistical correlations of charged
kaons were measured at $\sqrt{s_{NN}} = 200$ GeV collision energy by the
PHENIX experiment. Encouraged by previous results, a Levy-shaped particle
emitting source was assumed and the parametrizations of the measured
correlation functions were performed accordingly. The shape of these
functions is characterized by the...
Short-lived resonances can probe strongly interacting matter produced in high-energy heavy-ion collisions. The K*(892)± resonance is particularly interesting because of its very short lifetime (~4 fm/c), comparable to that of the hadronic phase. Therefore, it may be sensitive to the competing rescattering and regeneration mechanisms, which modify the particle's momentum distributions after...
Gauge fields provide the fundamental interactions in the Standard Model of particle physics. Gauge field configurations with nontrivial topological windings are known to play crucial roles in many important phenomena, from matter-anti-matter asymmetry of today's universe and the permanent quark confinement to topological phases in condensed matter. Their presence is however elusive for direct...
We present a new measurement studying the relationship between the production of hard and soft particles through the correlation of Upsilon meson states with the inclusive-charged particle yields in 13 TeV pp collisions. Measurements are made differentially for Upsilon momentum and for different Upsilon states. The analysis is performed using the full-luminosity ATLAS Run-2 13 TeV pp data. A...
The azimuthal anisotropies observed in small systems can originate from the final state response to the initial geometry as well as from initial momentum anisotropies. Recently it has been proposed that the correlation between the flow coefficient $v_{2}^2$ and the mean $p_\mathrm{T}$ carries information on the origin of flow in small collision systems by showing a characteristic sign change...
Heavy flavor production provides a unique probe for studying the transport properties of the quark-gluon plasma (QGP) formed in high-energy nuclear collisions. Experimental observables like the nuclear modification factor $R_{AA}$ and elliptic anisotropy $v_{2}$ of heavy flavor mesons are sensitive to the heavy quark diffusion coefficient. There now exist an extensive set of such measurements,...
We recently devised a methodology within automatic differentiation (AD) which integrates our physics-priors into the specific IPs and deep learning representation together to perform Bayesian inference on the IPs. We demonstrated the developed methodology in several IPs raised in high energy nuclear physics (can also be easily generalized to other physics areas as well). (1) We first deploy...
The production mechanism of deuterons, which have a binding energy of 2.2 MeV, is a topic of current interest in high-energy heavy-ion collisions, where the system undergoes kinetic freeze-out at temperatures around 100 MeV. Two possible scenarios include (a) statistical thermal process and (b) coalescence of nucleons. Cumulants of deuteron number distributions and proton-deuteron correlations...
We present a systematic study of $\Lambda$ hyperon polarization in heavy-ion collisions at HADES energies within the framework of microscopic transport model UrQMD combined with the hadron-resonance gas statistical model. This study demands a complex analysis of the fireball evolution including time slices, extraction of temperature and chemical potentials, as well as freeze-out conditions of...
We propose an observable counting a weighted difference between right-handed and left-handed lepton pairs, which is coined dilepton helical rate. The weight is the momentum difference of the lepton pairs projected onto an auxiliary vector. We derive the helical rate in a quark-gluon plasma with a vorticity in the limit when the quark and lepton masses are ignored. We find the helical rate is...
Determination of equation of state for the nuclear matter at high baryon density region is one of the most important motivations for RHIC Beam Energy Scan program. Directed flow ($v_{1}$), which is the first harmonic coefficient in the Fourier expansion of the final state azimuthal distribution of produced particles relative to the collision reaction plane, is one of the sensitive probes for...
We explore the ability of a recently proposed jet substructure technique, Dynamical Grooming, to pin down the properties of the Quark-Gluon Plasma formed in ultra-relativistic heavy-ion collisions. In particular, we compute, both analytically and via Monte-Carlo simulations, the opening angle $\theta_g$ of the hardest splitting in the jet as defined by Dynamical Grooming. Our calculation,...
Hydrodynamics has been quite successful in explaining observables of heavy ion collisions especially in low transverse momentum regime across varied collision systems. Recently hydrodynamics has also been used satisfactorily to explain proton-proton collision. This has been puzzling and has led to the discussion about the smallest volume for which hydrodynamics can be applied. The meaning of...
Fluctuations of conserved charges in a grand canonical ensemble can be computed on the lattice and, thus, provide theoretical input for freeze-out phenomenology. Electric charge fluctuations and the corresponding higher order correlators are extremely difficult, suffering form the most severe lattice artefacts.
We present new simulation data with a novel discretization where these effects are...
Light (anti-)nuclei produced in relativistic heavy-ion collisions, due to their composite structures, naturally encode the many-nucleon correlations. The light nuclei production is thus sensitive to the density fluctuation/correlation developed during the non-smooth phase transition from QGP to hadronic matter in relativistic heavy-ion collisions， providing a unique tool to probe the...
Short-lived resonances can probe strongly interacting matter produced in high-energy heavy-ion collisions. In particular, K*(892)$^{\mathbf{\pm}}$ is important because of its very short lifetime (around 4 fm/c), which is comparable to the partonic plasma phase. Also, its short lifetime can be used to study the rescattering and regeneration effect in the hadronic phase. An event shape...
We study the interaction of leading jet partons in a strongly interacting quark-gluon plasma (sQGP) medium based on the effective dynamical quasi-particle model (DQPM). The DQPM describes the non-perturbative nature of the sQGP at finite temperature $T$ and baryon chemical potential $\mu_B$ based on a propagator representation of massive off-shell partons (quarks and gluons) whose properties...
A non-equilibrium effective field theory framework has recently been formulated for fluctuating hydrodynamics [1]. In this talk, we present an example of applying this novel formalism to study the critical properties of QCD. In the view that non-Gaussian fluctuations of baryon density are important for the QCD critical point search, we derive evolution equations for the critical non-Gaussian...
We present our efforts to determine the QCD phase diagram using Complex Langevin simulations. These are lattice calculations, which allow direct simulations at non-zero chemical potential. Here we use two flavours of naive Wilson fermions with not too heavy pion masses ($\sim 480$ MeV). We report on our findings across the temperature-density plane. In addition, we also show our efforts to...
Functional forms of the neutron star Equation of State (EoS) are required to extract the viable EoS band from neutron star mergers. Typically, one of three methods are used-- spectral functions, piecewise polytropes, or gaussian process estimations. However, realistic nuclear EoS, containing deconfined quarks or hyperons, present nontrivial features in the speed of sound such as bumps, kinks,...
One important challenge in our field is to understand the initial condition of the QGP and constrain it using sensitive experimental observables. Recent studies show that the Pearson Correlation Coefficient (PCC) between vn and event-wise mean transverse momentum [pT], rho(vn, [pT]), and its centrality dependence can probe several ingredients of the initial state, such as number and size of...
The study of nuclear matter over a wide range of collision energy is provided by the RHIC Beam Energy Scan (BES). One focus of the program, namely to locate the critical point (CP) in the QCD phase diagram, is closely tied to the measurement of kurtosis in net-proton multiplicity distribution as a function of $\sqrt{s_{NN}}$. Previous results from BES-I obtained with 3.1$\sigma$ significance...
Strong magnetic fields are created at the early stage of non-central heavy-ion collisions. However, whether the magnetic fields survive in the late stage of heavy-ion collisions and experimental measurements of various observables are reminiscent of the initially-created magnetic fields still remain elusive. In this talk we show that fluctuations of and correlations among net baryon number,...
Global, pT-integrated polarization of Lambda hyperons in heavy-ion collisions is described well in hydrodynamic and transport models. However, a proper description of the azimuthal angle dependence of Lambda polarization remains a puzzle. Recently introduced spin-shear coupling improves the agreement with the experiment, which is still far from being satisfactory.
In this contribution, we...
It is known that 1+1 dimensional real scalar models with a negative mass squared have a soliton solution called the kink. We analyze the distribution of the energy-momentum tensor around the kink by incorporating the quantum correction up to leading order. The Fourier transform of the distribution corresponds to the gravitational form factors. We employ the collective coordinate method which...
We investigate the gravitational form factors of the baryon octet within the framework of the chiral quark-soliton model, also known as the pion mean-field approach, emphasizing the effects of flavor SU(3) symmetry breaking on the
form factors. The D-term form factors provide information on the stability conditions of the baryon octet in terms of the pressures and shear forces inside them. We...
Our understanding of hadronic collisions has been challenged by the intriguing observation of collective phenomena in events with high charged-particle multiplicity density in small systems. Such high multiplicities are expected in events with multiple parton-parton interactions (MPI). At the LHC, MPIs affect the production of heavy-quarks (charm and beauty), and the large statistics samples...
\begin{abstract}
Recent experiments have observed large anisotropic collective flows in high multiplicity proton-lead collisions at the Large Hadron Collider (LHC), which indicates the possible formation of mini quark-gluon plasma (QGP) in small collision systems.
However, no jet quenching has been confirmed in such small systems so far.
To understand this intriguing result, the system...
Heavy quark production is an important experimental observable that sheds light on the heavy quark interaction with the nuclear medium. With high statistics datasets, tracking and PID at very low transverse momentum, and excellent vertexing capabilities, LHCb performs precision measurements of a rich set of heavy flavor hadrons, including open charm hadrons and charmonia. These capabilities...
Early production of heavy quarks (charm and bottom) in the heavy-ion collisions
and their associated large mass scale renders them as useful probes for studying the quark-gluon plasma (QGP) properties. We study the heavy quark transport coefficients, drag and momentum diffusion, as a function of their initial momentum and QGP temperature for elastic and inelastic processes. The thermal medium...
We present a systematic method for solving the Lindblad equation for heavy-quarkonium dynamics in the quark-gluon plasma which accounts for corrections that are next-to-leading order (NLO) in the ratio of the binding energy of the state and the temperature. The method used relies on mapping the three-dimensional Lindblad evolution to the solution of the one-dimensional Schrodinger evolution...
The study of event-by-event mean transverse momentum ($p_\mathrm{T}$) fluctutations is a useful tool to understand the dynamics of the system produced in ultrarelativistic heavy-ion collisions. The measurement of higher-order fluctuations of mean-$p_\mathrm{T}$ can help in probing the hydrodynamic behavior of the system and is considered to be a direct way of observing initial-state...
The detection of cosmic-ray antinuclei is a potential breakthrough approach for the identification of dark matter. Dominant sources of antinuclei in the astrophysical background are proton-proton interactions. Typically, a process producing heavier antinuclei will also produce antiprotons. Therefore, the antiproton production constrains the other antinuclei when assuming specific parameters...
Although signatures of collectivity in high-multiplicity pA collisions suggest possible final-state interactions, an unambiguous search of jet quenching in small collision systems is still missing. Using quark mass as another handle, heavy-flavor observables can shed light on different mechanisms of jet modification in $p$-Pb, $d$-Au, and O-O collisions. We employ a coupled DGLAP evolution...
While it is well known that there is a significant amount of conserved charges in the initial state of nuclear collisions, the production of these due to gluon splitting has yet to be thoroughly investigated. The ICCING (Initial Conserved Charges in Nuclear Geometry) algorithm [1] reconstructs these quark distributions, providing conserved strange, baryon, and electric charges, by sampling a...
Short-lived hadronic resonances are very useful to probe the late-stage evolution of ultra-relativistic heavy-ion collisions. Since their lifetimes are comparable to the hadronic phase timespan, their measured yields are modified via rescattering and regeneration processes. The suppression of the K$^{*0}$/K ratio in central Pb--Pb collisions compared to pp interactions already hints at the...
The understanding of the mechanisms for the production of weakly bound clusters, such as a deuteron $d$, in heavy-ion reactions at midrapidity is presently one of the challenging problems which is also known as the "ice in a fire" puzzle.
In this study we investigate and compare two main mechanisms for the deuteron production based on the Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) [1]...
Hypernuclei are bound nuclear systems of correlated nucleons and hyperons. Therefore, the production of hypernuclei in heavy-ion collisions provides an experimental avenue for studying hyperon$-$nucleon (Y-N) interaction, which is an important ingredient, not only in the equation-of-state of astrophysical objects such as neutron stars, but also in the description of the hadronic phase of a...
The chiral magnetic effect and chiral vortical effect enable us to probe possible local parity violation in hot dense matter created in heavy ion collisions. While equilibrium description is simple, the situation in heavy ion collisions can be quite far from equilbirum: the axial charge is likely to peak at early stage of the collisions [1-3], and the magnetic field and vorticity are also...
Motivated by the study of beauty quarks to probe the evolution of the nuclear medium, we performed a measurement of the $B^{+}$ meson production $pPb$ collisions and its nuclear modification factor. We present the results as a function of $p_{T}$ and charged multiplicity, using data recorded with the CMS detector in 2013 (5.02 TeV) and 2016 (8.16 TeV). The results are presented in a large...
Quarkonia and tetraquark production have been long-standing puzzles in particle physics. The polarisation measurement of J/ψ is expected to have significant transverse polarisation at large pT, but has been experimentally observed to be consistent with zero. Hard production of onia processes using NRQCD formalism are available in MC generators, such as Pythia8. However, these processes alone...
We show that the same QCD formalism that accounts for the suppression of high-$p_T$ hadron spectra in heavy-ion collisions predicts a medium-enhanced $c\bar{c}$-pair production in high-$p_T$ jets. We study the feasibility of detecting this new medium induced phenomena in the upcoming and future high-luminosity heavy ion runs.
The NA61/SHINE experimental physics program focuses on searching for the critical point and studying the properties of the onset of deconfinement in the strongly interacting matter. A two-dimensional scan is performed by varying the beam momentum (from 13$A$ to 150/158$A$ GeV/$c$) and the system size (from p+p to Pb+Pb) of the collided nuclei. This contribution presents results on $K^*(892)^0$...
Extraction of the Quark-Gluon Plasma (QGP) transport properties (i.e. specific shear viscosity $\eta/s$) is a prime goal of the heavy-ion programs at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC). Correlators that are sensitive to both initial-state effects and final-state viscous attenuation can give invaluable constraints for temperature ($T$) and chemical...
We investigate the impact of a first-order chiral phase transition and critical point on hadron multiplicity ratios. We model the dynamical expansion of the hot and dense matter created in a heavy ion collision with a Bjorken hydrodynamics expansion coupled to the explicit evolution of the chiral order parameter at center-of-mass energies from 2 to 10 GeV. Hereby, the chiral dynamics is...
Fluid dynamical modelling of heavy-ion collisions at RHIC BES, as well as at future FAIR and NICA energies, has its own challenges as compared to classical top RHIC or LHC studies. One of them is due to the long inter-penetration phase of the incoming nuclei, which results in a complex geometry of the initial state. Conventional hydrodynamic models, where fluid phase starts at a fixed proper...
Hadronic resonances are effective tools for studying the hadronic phase in ultra-relativistic heavy-ion collisions. In fact, their lifetime is comparable to the hadronic phase and resonances are sensitive to the hadronic phase effects such as rescattering and regeneration processes which might affect the resonance yields and shape of the transverse momentum spectra. $\Lambda(1520)$ has a...
We consider the experimental data on yields of protons, strange Λ’s, and multistrange baryons (Ξ, Ω), and antibaryons production on nuclear targets, and the experimental ratios of multistrange to strange antibaryon production, at the energy region from SPS up to LHC, and compare them to the results of the Quark-Gluon String Model calculations. In the case of heavy nucleus collisions, the...
The LHCb spectrometer has the unique capability to function as a fixed-target experiment by injecting gas into the LHC beampipe while proton or ion beams are circulating. The resulting beam+gas collisions cover an unexplored energy range that is above previous fixed-target experiments, but below the top RHIC energy for AA collisions. Here we present new results on antiproton and charm...
Femtoscopy is a tool that can be used to measure the space--time dimensions of the particle-emitting source created in heavy-ion collisions using two-particle correlations. Additionally to the measurement of the system size, one can extract the average pair-emission asymmetry between two particles with different masses. In this context, the measurement of femtoscopic correlations between...
At RHIC, a fireball forms in the Au-Au collision and rapidly cools during expansion, inside which the QCD matter undergoes a phase transition from quark-gluon-plasma to the hadronic phase. The phase transition signals are expected to be observed via the measurement of fluctuations of conserved charges such as baryon numbers [1]. Indeed, both the dynamical evolution and the...
The Kondo effect in metals is induced by a spin exchange interaction between conduction electrons and localized impurities. This effect drastically modify electric/thermal/transport properties of metals at low temperatures. In high-density quark matter, a similar effect can be induced by interactions between light quarks and colored impurities like charm or bottom quarks, which is the...
A major challenge for the upcoming heavy-ion collision programmes around the world is to develop fast, accurate techniques to analyze the large amounts of data produced in the experiments. Novel data analysis techniques are necessary in the experiments to quickly identify events with interesting physics for further analyses and permanent storage. In this talk, we show that PointNet based Deep...
Using 3-fluid dynamical (3FD) model and microscopic transport model UrQMD,
we made predictions for the global polarization of Λ and anti-Λ hyperons
in Au+Au and Ag+Ag collisions at moderately relativistic collision
energies of √(s_NN ) = 2.4−11 GeV. The dependence of the polarization on
the centrality of the collision, as well as on the rapidity and transverse
momentum, is studied....
The effect of deformation in nuclear geometry on both initial and final state observables has been reported by recent theoretical developments as well as experimental studies. However, in addition to fixed nuclear deformation, the nuclear geometry can manifest "Shape Coexistence" as evident from low-energy spectroscopic measurements. This study aims to quantify the effects of shape coexistence...
Relativistic heavy-ion collisions provide a unique opportunity to investigate properties of nuclear matter under extremely strong electromagnetic field. Using a heavy quark transport model that includes both collisional and radiative energy loss of heavy quarks, coupled to a (3+1)-dimensional viscous hydrodynamic model CLVisc, we study the initial longitudinal energy density distribution and...
We propose that the yield ratio of free spectator neutrons produced in ultracentral $^{96}$Zr+$^{96}$Zr to $^{96}$Ru+$^{96}$Ru collisions is a robust probe of the neutron-skin thickness $\Delta r_{\mathrm{np}}$ and the slope parameter $L$ of the symmetry energy. The idea is demonstrated based on the proton and neutron density distributions of colliding nuclei from the Skyrme-Hartree-Fock...
The Spin Hall Effect (SHE) is a generation of spin polarization for moving spin carriers in materials under an external electric field and is instrumental in investigating quantum effects in many-body systems [1]. Recent theoretical calculations indicate that the gradient of baryonic chemical potential (analogous to the electric field) can induce a sizeable spin Hall current in Au+Au...
We compute electro-production of P_c(4312) in e^-+p^+→e^-+P_c using Vector Dominance Model assuming four possible spin parity of P_c (4312),J^P=(1/2)^±,(3/2)^±. Electron Ion Collider which is to be built at Brookhaven National Laboratory, we can collide not only unpolarized beam of electron and proton, but also polarized beam so we can investigate more deeply about the angular distribution of...
The measurement of spin polarization of particles emitted in heavy-ion collisions has opened the possibility for new phenomenological investigations of spin physics in relativistic fluids. This motivates the development of hydrodynamic with spin degrees of freedom. One of the features of this theory is that different choices of the decomposition of orbital and spin angular momentum might give...
We present a novel framework ebe-DREENA, based on a state-of-the-art dynamical energy loss model, which can include any temperature profile from bulk medium simulations. The framework is fully optimized to exploit different state-of-the-art medium evolutions - both event-by-event hydrodynamics and kinetic transport theory. It does not use fitting parameters within the energy loss model,...
We derive a quantum kinetic theory for QED based on Kadanoff-Baym equation[1]. By assuming parity invariance and considering a complete set of self-energy diagrams, we find the resulting kinetic theory expanded to lowest order in $\hbar$ generalizes the well-known classical kinetic theory to massive case. It contains elastic and inelastic collision terms and integrates screening effect...
In this contribution, we present for the first time a scenario according to which early quark deconfinement in compact stars is triggered by the Bose-Einstein condensation (BEC) of a light sexaquark (S) with a mass $m_S<2054$ MeV, that has been suggested as a candidate particle to explain the baryonic dark matter in the Universe. The onset of S BEC marks the maximum mass of hadronic neutron...
The definitive confirmation of gluon saturation effects in high energy hadronic collisions is still outstanding. A promising route to pin down saturation effects is the simultaneous study of vector meson and charged hadron production. Heavy vector mesons, whose mass is of the order of magnitude of the saturation scale, are expected to be less sensitive to saturation effects than lighter...
In high-energy heavy-ion collisions, the energy density profile of the produced quark-gluon plasma and its space-time dynamics are sensitive to the shape and radial profiles of the nuclei, described by the collective nuclear structure parameters including quadrupole deformation $\beta_2$, octupole deformation $\beta_3$, radius $R_0$ and surface diffuseness $a$ [1-3]. Using AMPT simulations as...
Heavy quarks, such as charm and bottom quarks, and their quarkonium bound states are very useful internal probes of the hot and dense medium, Quark gluon-plasma, created in heavy-ion collisions. They are created in the collisions and are appreciably affected by the medium. This leads to distinctive features in their observed final yields which carries information about the bulk properties of...
The existence and location of the QCD critical point is an object of both
experimental and theoretical studies. Rich data recorded by NA61/SHINE
at SPS allow for a systematic search for non-monotonic dependence of
various correlation and fluctuation observables on collision energy and
size of colliding nuclei.
This contribution will review the NA61/SHINE studies of scaled...
For several years there has been a strong interest in measuring collective effects in small systems such as proton-proton (pp) and proton-lead (pPb). Such measurements give new insights into the nature of QCD and the meaning of collectivity. In recent years ALEPH, ATLAS, and ZEUS collaborations have extended these studies to electromagnetic interactions such as electron-positron (ee),...
We calculated the shear viscosity of strange and non-strange hadrons
produced in central gold-gold collisions at intermediate energies. For
calculations of the collisions the transport model UrQMD is employed.
The shear viscosity is obtained within the Green-Kubo formalism. The
hadron resonance gas model is used to determine temperature and chemical
potentials of baryon charge and...
The spin Hall effect (SHE) is a generation of spin polarization for moving spin carriers in materials under an external electric field and has been observed in semiconductors, metals, and insulators at or below room temperature. Recent theoretical analyses show that spin Hall current can be induced by the baryon chemical potential gradient which plays the role of the analogous electric field...
Utilizing a thermodynamic T-matrix approach for heavy-quark (HQ) transport in the quark-gluon plasma (QGP) we compute the effects of spin-dependent interactions between partons. Based on the vacuum Cornell potential, we first confirm that the experimental values of the mass splittings in quarkonia are improved by employing a confining potential that is a mixture of vector and scalar potentials...
Hadronic transport models are central approaches to study strangeness production from hadron interactions at low-beam energies.
At these energies, results from ArKCl and pNb collisions sparked interest in the last years, since much higher yields of double-strange hadrons were observed than theoretically expected. Therefore, in this work, a previously suggested mechanism to produce $\phi$...
Relativistic heavy-ion collisions provide a unique opportunity to study the properties of strongly interacting matter under extreme conditions. Search for the QCD critical point and the onset of deconfinement is the main motivation of the beam energy scan (BES) program at RHIC. Strangeness (especially the multi-strangeness) production has been suggested as a sensitive probe to the early...
Strangeness production has been suggested as a sensitive probe to the early-time dynamics of the deconfined matter created in heavy-ion collisions. The ratios of particle yields involving strange particles are often utilized to study various properties of the created nuclear matter, such as the strangeness chemical potential and the chemical freeze-out temperature. Analysis of $d$+Au data...
Exploring the QCD phase diagram and searching for the QCD critical point are some of the main goals of Beam Energy Scan (BES-I) program at RHIC. In 2017, as a continuation to BES-I, the STAR experiment collected large datasets of Au+Au collisions at $\sqrt{s_{NN}} =$ 54.4 GeV. The identified particle spectra and yields provide information about the bulk properties of the medium. The centrality...
Hadronization is a non-perturbative process, which theoretical description can not be deduced from first principles. Modeling hadron formation, requires several assumptions and various phenomenological approaches. Utilizing state-of-the-art Computer Vision and Deep Learning algorithms, it is eventually possible to train neural networks to learn non-linear and non-perturbative features of the...
The addition of a Forward Calorimeter (FoCal) to the ALICE experiment is proposed for LHC Run 4 to provide unique constraints on the low-x gluon structure of protons and nuclei via forward measurements of direct photons. A new high-resolution electromagnetic Si-W calorimeter using both Si-pad and Si-pixel layers is being developed to discriminate single photons from pairs of photons...
We investigate the masses and radii of neutron stars within the framework of the in-medium modified chiral soliton model, considering the effects of surrounding baryonic environment on the properties of in-medium baryons. The equation of state describing an infinite and asymmetric nuclear matter are obtained by introducing the density-dependent functions. To extrapolate the high density and...
While the $\phi$ meson vacuum properties, such as mass and width, are well known,
it is not clear how these properties will change once it is put in a dense
environment such as nuclear matter.
Theoretically, many works have been conducted with the aim of studying the $\phi$
meson in nuclear matter. Connecting theoretical results with experimental
measurements is, however, not a...
We investigate the axial-vector meson $h_1$. We coupled 4 channel, $\pi\rho$, $\eta\omega$, $K\bar{K}^*$ and $\eta\phi$, which generate two resonance structure within energy up to 600 MeV above the threshold. Moreover, having reproduced the experimental data of charge exchange reaction ($\pi p\to 3\pi n$), we extract the pole position and residue of each resonance and identify them as the...
We consider the probability of thermal production of uuddss states with small radii $r=01-0.4$ fm and small masses $m<2$ GeV in Pb+Pb collisions at \sqrt(s)=2.76 TeV. We use thermal model which was tuned to AGS, RHIC, LHC data and predicts $T=150-170$ MeV.
Hereby we compare the production rates for Sexaquarks with different masses and different radii.
We found that sexaquarks are produced...
Extremely large angular orbital momentum can be produced in non-central heavy-ion collisions, leading to a strong transverse polarization of partons that scatter through the quark-gluon plasma (QGP) due to spin-orbital coupling. To understand the hyperon polarization observed in relativistic nuclear collisions, we develop a microscopic approach to describe the formation and space-time...
Dielectrons are an exceptional tool to dissect the evolution of the medium created in heavy-ion collisions. In central collisions, the energy densities are sufficient to create a quark-gluon plasma (QGP). Thermal $e^+e^-$ pairs with invariant mass around $1.5 \mathrm{GeV}/c^2$ can be used to estimate the temperature of the QGP.
At LHC energies, the cross section of heavy-flavour (HF)...
Anisotropic flow of the medium formed in heavy-ion collisions is a sensitive observable to the equation of state and transport properties of the medium. The third order anisotropy known as triangular flow ($v_{3}$) arises mainly due to the fluctuations present in the initial stages of the colliding nuclei. The triangular flow is found to be more sensitive to the transport property such as...
We have proposed a mechanism for Xi baryon production in proton-nucleus collisions in which hyperon resonances and anisotropic hyperon production played a role. Parameters of the model were chosen to account for the observed Xi multiplicity by the HADES collaboration (GSI, Darmstadt) in sub-threshold p+Nb collisions. [1] In the present contribution, we investigate whether a similar mechanism...
