We investigate $\Lambda_{c}-N$ interaction in the spin singlet channel ($^1S_0$) and the spin triplet coupled channel ($^3S_1-{^3D_1}$) from lattice QCD by using HAL QCD method. We perform the first physical point simulation by employing gauge configurations generated by the HAL Collaboration at $m_{\pi}\simeq137$ MeV, $m_{K}\simeq 502$ MeV, and $a \simeq 0.0844$ fm on $96^4$ lattices...
The recent CMS jet measurement provides new insights into understanding the QCD hard processes in the high-multiplicity limit (with $n>100$ tracks in jet). In this study, we aim to understand the dynamics that gives the broad multiplicity distribution $P(n)$ in the jet and the origin of the high-multiplicity tail. We start with a set of assumptions on the multiplicity distribution coming from...
In this work, we systematically study the effects of hadronic rescattering on heavy flavored hadrons. With the hadronic transport approach SMASH, we create the most basic approximation of a hadronic afterburner -- a thermalized and expanding sphere of hadron gas --, where we observe the ``pion wind'' phenomenon and its dependence on the cross section assumption. Further in complexity, we...
In recent years, CMOS silicon pixel detectors have seen significant advancements and a widespread usage across various physics fields, allowing for significant improvements of the particle detection technologies. One relevant example is the ALPIDE chip, which is a CMOS Monolithic Active Pixel Sensor developed for the upgrade of the Inner Tracking System of the ALICE experiment at the LHC.
On...
This study focuses on the measurement of b-jet production in pp collisions at 13.6 TeV with the ALICE detector. The accurate identification of b-jets is crucial for understanding heavy-flavour quark production and fragmentation. This analysis concentrates on tagging beauty jets using the secondary-vertex method which excels in identifying long-lived hadrons containing a b quark by analyzing...
Beauty-jets (b-jets) refer to sprays of collimated particles produced from the fragmentation of beauty quarks generated in hard scatterings at collider experiments. Compared to jets produced by the fragmentation of light quarks and gluons, b-jets are characterised by the presence of displaced secondary vertices, due to the decay of beauty hadrons which have a relatively long lifetime ($c\tau...
Modification of jets is a powerful tool to diagnose a quark gluon plasma (QGP) in high-energy heavy-ion collisions. During propagation of partons in a jet through the QGP medium, constituents of the medium acquire high energy and momentum from them and are kicked out to be non-equilibrated partons. These partons are called the recoil partons. Together with how the jet partons radiate energy...
The ITS3 is the future upgrade for the ALICE Inner Tracking System for Run 4 of the LHC. It replaces the three innermost layers with a truly cylindrical design of bent and stitched MAPS sensors, along with material budget as low as 0.07% $X_0$ per layer and less than 40 mW/cm$^2$ power consumption. These improvements increase the pointing resolution by a factor of two, and tracking efficiency...
Bottomonium production is sensitive to both the structure of nucleons and
the interactions of b quarks with the nuclear media produced in heavy-ion colli-
sions. The LHCb detector’s forward geometry allows for studying bottomonium
production in a unique kinematic regime. Recent LHCb studies of bottomonium
production will be presented, including measurements sensitive to final-state...
Heavy-flavour jets, defined as collimated bunches of hadrons originating from the fragmentation of heavy-flavour quarks such as beauty quarks, are produced in high-energy collisions. The cross section of heavy-flavour quark production can be calculated using perturbative quantum chromodynamics (pQCD) due to their generation through high momentum transfer at low $p_{T}$, attributed to their...
Quarkonium production is considered one of the golden probes of quark-gluon plasma (QGP) formation in heavy-ion collisions. Quarkonium production in small collision systems is also important for investigating production mechanisms and providing a reference for heavy-ion collisions. Charmonium, a bound state of charm and anti-charm quark pairs, has its production mechanism described by...
Heavy-ion collisions have been used to study quark-gluon plasma (QGP) and can be used to study strong electromagnetic (EM) fields. Because the EM fields penetrate the QGP medium, their evolutions are coupled together. In turn, probes like the flow of direct photons and charged particles will be modified by the coupling [1, 2]. Usually, the EM field modifications are considered separately from...
Measurements of the relative production of strange hadrons in high-energy hadronic collisions have proven to be an important tool for understanding hadronization. In particular, it has been shown that strangeness is produced more abundantly in high-multiplicity pp and p-Pb collisions at the LHC, a phenomenon known as "strangeness enhancement" that has sparked significant interest in both the...
Multi-differential measurements of dilepton spectra serve as a unique tool to characterize the properties of matter in the interior of the hot and dense fireball. An important property of virtual photons is their spin polarization defined in the rest frame of the virtual photon for a chosen quantization axis. While the total yield and observable spectra are proportional to the sum of the...
Jet interactions with the color-deconfined QCD medium in relativistic heavy-ion collisions are conventionally assessed by measuring the modification of the distributions of jet observables with respect to their proton-proton baselines. Deep learning methods allow us to evaluate the modification of jets on a jet-by-jet basis, and therefore significantly improve the capability of using jets to...
The Electron-Ion Collider (EIC) is a future particle accelerator at Brookhaven National Laboratory. It will provide physicists with high luminosity and highly polarized beams with a wide range of nuclei species at different energies, covering an extensive kinematic range, which will provide unprecedented access to the spatial and spin structure of proton, neutron, and light ions. The EIC...
Electron-positron pairs with low invariant mass are a versatile tool for studying the properties of the quark-gluon plasma created in ultra-relativistic heavy-ion collisions. Due to their electromagnetic nature and the variety of sources that can produce such pairs, they allow to study the whole space-time evolution of the system undistorted by strong final-state interactions. However, a...
In high-energy proton-proton (pp) collisions, the study of dimuon production provides crucial insights into particle production mechanisms and can serve as a baseline for the study of the properties of the quark-gluon plasma (QGP). In particular, the low (below the phi mass) and intermediate (between the phi and the J/psi) invariant mass regions are of interest for measurements of vector...
Nonextensive statistics [1] has attracted attention as a description of an extended range of hadronic particle spectra in nuclear collisions. In this study, we consider a relativistic hydrodynamic model with Tsallis statistics [2] to estimate direct photons, which are a prominent observable for understanding the properties of the QCD matter. Nonextensivity enters the model via the modification...
As electromagnetic probes, photons have the advantage of escaping unimpeded from their emission source. Consequently, photons can carry valuable information about the properties and dynamics of the hot QCD medium created in heavy-ion collisions. Particularly, the transverse momentum distribution of direct virtual photons emitted from the hot QCD medium exhibits sensitivity to the system...
Recent measurement on nuclear modification of $B_c$ mesons at the LHC serves as a novel probe of heavy quark interaction with the QGP in relativistic heavy-ion collisions. Within a linear Boltzmann transport model that incorporates both Yukawa (perturbative) and string (non-perturbative) interactions between heavy quarks and the QGP, we study dissociation and regeneration of $B_c$ in these...
Energy-energy correlators (EECs) have been proposed to study the structure of energy flow within jets. These functions are defined as the energy-weighted cross-section of particle pairs inside jets. The correlation as a function of pair distance and jet transverse momentum shows a clear separation between the perturbative and non-perturbative regimes, where one can probe the dynamics of the...
High-multiplicity triggered events produced in pp collisions at $\sqrt{s}=13$ TeV collected by ALICE detector are analyzed to study the mean transverse momentum ($p_{\rm T}$) fluctuations. The study is inspired by the idea that non-monotonic changes in $p_{\rm T}$ correlations vary with energy and, if observed, may be taken as an indicator for the {\footnotesize QGP} formation. The finding...
Partonic scatterings with high momentum transfer occur before the formation of the quark-gluon plasma (QGP) in heavy-ion collisions and result in collimated collections of hadrons, called jets. The modification of the high-virtuality parton shower in the QGP compared to that in proton-proton collisions offers insight into the nature of colored probes' interaction with the medium.
To study...
Understanding the nonperturbative process of hadronization is a persistent
goal in experimental studies of QCD. Since heavy quark production is suppressed
at the hadronization scale, heavy-flavor hadrons offer a high-precision probe of
the connection between theoretical calculations and experimental final states.
Jets containing different flavors of these heavy hadrons, reconstructed...
Experimental data on a wide range of jet observables measured in heavy ion collisions provide a rich picture of the modification of jets as perturbative probes and of the properties of the created quark-gluon plasma. However, their interpretation is often limited by the assumptions of specific quenching models, and it remains a challenge to establish model-independent statements about the...
In this talk we discuss factorization of jet cross sections in heavy-ion collisions based on fixed-order calculations. First, using Glauber modelling of heavy nuclei, a factorized formula for jet cross sections is derived, which involves defining jet functions in QCD medium. Then, we present our result of the jet function for producing a heavy quark-antiquark pair, denoted by QQ̅, at leading...
Substructure measurements of jets containing heavy-flavor hadrons play an important role in testing pQCD calculations in proton-proton (pp) collisions and are critical tools for studying the quark-gluon plasma (QGP) created in heavy-ion collisions. We study three different $\rm D^0$-tagged jet axis definitions with varying degrees of sensitivity to wide-angle radiation: Standard, Soft Drop...
In 2022, the ALICE Collaboration commenced Run 3 with upgrades to the Inner Tracking System (ITS2) and the Time Projection Chamber (TPC), both pivotal for probing rare phenomena with unprecedented precision. The upgrades to ITS2 enable higher tracking resolution, while the improvements to the TPC allow for continuous readout, significantly boosting data acquisition and resolution. Using these...
In high-energy hadronic collisions, heavy flavors are a sensitive tool for studying the physics of strong interactions. In particular, heavy-flavor measurements in proton-proton (pp) collisions are most suitable to test QCD calculations and serve as baseline for studies in heavy-ion collisions. One measurement particularly sensitive to the production mechanism of heavy quarks is the azimuthal...
We use the parametric approach to analyze jet suppression measured using the nuclear modification factor of inclusive jets, b-jets, and jets from gamma-jet events. With minimum model assumptions, we quantify the magnitude of the average energy loss, its pt-dependence, intial parton-mass dependence, and flavor dependence. Further, we quantify the impact of fluctuations in the energy loss and...
Particle correlations are powerful tools for studying quantum chromodynam-
ics in hadron collisions. In heavy-ion collisions, azimuthal angular correlations
probe collective phenomena in hot, dense, nuclear media, such as QGP. Angular
correlations in small collision systems could point to QGP production or poten-
tial initial-state correlations. The LHCb experiment has the unique ability...
We propose a novel approach to probe primordial inhomogeneity in hot and dense matter which could be realized in noncentral heavy-ion collisions. We discuss the possibility of clustered sub-structures along the axis parallel to the magnetic field. Even if the magnetic field is short-lived, the pseudo-one-dimensional nature in the early dynamics can induce the inhomogeneity which could remain...
In this contribution, recent results for helium identification and produc-
tion at LHCb will be discussed. From √sNN = 13 TeV pp collisions, a nearly
background-free sample of more than 105 helium candidates is identified by their
ionisation losses in the silicon detectors, combined with information from the
calorimeter, the muon chambers and the RICH detector. Combined with the...
The Forward Calorimeter (FoCal) detector is scheduled for installing in the ALICE experiment for the LHC-Run4 upgrade (2029-2032).
The FoCal consists of the FoCal-E (Electromagnetic Calorimeter) and the FoCal-H (Hadronic Calorimeter). The FoCal-E is a detector based on a Si sensor and tungsten to measure direct photons at forward rapidity.
For the readout, each Si pad hosts the HGCROC2...
In heavy-ion collisions, jets formed from hard-scattered partons experience an overall energy loss and have a modified internal structure compared to vacuum jets. These modifications are a result of the interactions between the energetic partons in a jet shower and the strongly coupled quark-gluon plasma (QGP). As the jet traverses the QGP, it loses momentum to the medium, which in turn...
The phenomena of Jet Quenching, a key signature of the Quark-Gluon Plasma (QGP) formed in Heavy-Ion (HI) collisions, provides a window of insight into the properties of this primordial liquid. In this study, we rigorously evaluate the discriminating power of Energy Flow Networks (EFNs), enhanced with substructure observables, in distinguishing between jets stemming from proton-proton (pp) and...
A collaboration of scientists from LANL, MIT, FNAL, NJIT, ORNL, and GIT, supported by the DOE Office of Science Nuclear Physics AI Machine Learning initiative, is exploring advanced AI technologies to tackle data processing challenges at RHIC and the future EIC. The main objective is to develop a demonstrator for real-time processing of high-rate data streams from sPHENIX experiment tracking...
The sPHENIX collaboration has been taking data since 2023 at the Relativistic Heavy Ion Collider in BNL to study the Quark-Gluon Plasma and cold-QCD. A detector complex consisting of the solenoid magnet, a hadron calorimeter, an electromagnetic calorimeter, a time projection chamber, a MAPS-based vertex detector, and the intermediate silicon tracker (INTT). A tracking system formed by the...
Hadronisation is the complex process through which hadrons form from partons. Given its non-perturbative nature, an exact theoretical description is unavailable, necessitating phenomenological assumptions.
In the first part of my presentation, I will discuss novel observables that differentiate between models with distinct hadronisation mechanisms and examine current models limitations....
Experimental observations have measured finite azimuthal anisotropies in small systems produced in pp and pA collisions, even at large pT which may imply the formation of a Quark-Gluon Plasma. In heavy-ion collisions, high-pT azimuthal anisotropies are understood to be generated by the path-length dependent energy loss. However, in small systems, even if a QGP is formed, the medium is so small...
Elliptic flow ($v_{2}$) at high transverse momentum ($p_{T}$) serves as an important hard probe to study the properties of quark-gluon plasma (QGP). The non-zero high-$p_{T}$ $v_{2}$ values observed in experiments are often attributed to the path-length dependence of energy loss in the medium due to the asymmetry in the reaction zone. However, recent findings suggest a potential role for...
The virtual prompt photons are produced at the initial stage of heavy-ion collisions and are sensitive to the extremely strong magnetic field produced in non-central heavy-ion collisions. At LHC energies, this magnetic field can reach intensities of $10^{15}$ - $10^{16}$ T. In the presence of this magnetic field, the dilepton decayed from a virtual photon can be polarized in response to the...
Azimuthal anisotropies of energetic particles produced in heavy-ion collisions are understood as an effect of a geometrical selection bias due to energy loss. In the measured ensemble, particles oriented in the direction in which the medium is shorter are over-represented as compared to those oriented in the direction in which the medium is longer. In this work we present the first...
We study jet production and modification in lead-lead collisions at the LHC energies within a recently introduced SUBA-Jet framework [1]. The core of the framework is a time-like parton shower that starts with a seed parton with high $Q^2$, as well as realistic fluid dynamic evolution of the medium, simulated using the vHLLE code. The initial seed partons are produced by PYTHIA, whereas the...
Measurements of jets that traverse the QGP provide insights into the jet energy loss. Considering jets of various radii can help elucidate how the parton energy is transferred to the medium as well as the medium response. Measurements of the dijet momentum balance and pair nuclear modification factor are presented for anti-kt jets reconstructed with radius R = 0.2, 0.3, 0.5, 0.4, and 0.6,...
Jets are produced by highly virtual quarks and gluons that emerge from initial hard scattering processes and are an important probe of the QCD evolution of the collision. Jet measurements in small systems such as pp are important in order to provide constraints on the parton distribution functions (PDFs) of the proton and the strong coupling constant $\alpha_{s}$. They also test pQCD...
In high-energy heavy-ion collisions, jets traverse the quark-gluon plasma (QGP) and deposit energy into the medium, leading to jet-induced medium response. The medium response takes the form of Mach-cone-like excitations and can modify the internal structure of the jet, affecting many observables, such as jet shape and jet fragmentation function and so on. However, simulating jet-induced...
Collisions of heavy nuclei at relativistic energies generate a hot and dense medium, whose microscopic properties can be studied with electromagnetic probes.
Dileptons serve as a unique tool because they do not interact strongly with the surrounding matter and carry undisturbed information about the QCD matter produced in the reaction.
By examining low-mass and low-momentum dileptons, we...
The small-system collisions (p/d/He+A) became of great interest since the finding of the flow of the particles which had been considered as a strong signature of the QGP production. On the hard and EM probes side, those that have been measured to characterize the QGP, such as Jets (or high pT hadrons), heavy flavor hadrons, and direct/thermal photons, have also been measured in the small...
Recent measurements of charm baryon-to-meson production-yield ratio at the LHC have shown a substantial enhancement of charm-baryon production in pp collisions as compared to electron-positron and electron-proton collisions. This evidence currently can be interpreted as a modification of the charm hadronization mechanism in hadronic collisions, disproving the assumption of universality of...
Jet substructure measurements, using the distribution of final state hadrons, provide insight into partonic showers and hadronisation. Observables for such measurements include the transverse momentum ($j_\mathrm{T}$) with respect to the jet axis and longitudinal momentum fraction ($z$) of jet constituent particles. ALICE has recently measured the $j_\mathrm{T}$ distributions of the jet...
Quarkonium production in high-energy proton-proton (pp) collisions is an important tool for studying perturbative and non-perturbative aspects of quantum chromodynamics. Charmonia are bound states of charm and anti-charm quarks and their production process can be factorized into two stages: the heavy quark production and the formation of the bound state. The former happens within initial hard...
The high-intensity beams provided by the CERN SPS in a wide energy interval offer a unique opportunity to investigate the QCD phase diagram at high baryochemical potential $\mu_B$. The NA60+ experiment, proposed for taking data with heavy-ion collisions at the SPS in the next years, has a strong potential for investigating the QCD phase diagram via measurements of electromagnetic probes in a...
Due to multiple scattering with the medium, hard partons can be driven slightly off-shell leading to medium-induced radiation. The BMDPS-Z framework [1], developed within the light cone path integral formalism, has been instrumental in obtaining the medium-induced radiation spectra. This framework was reformulated by Caron-Huot and Gale [2] into a radiation rate and solved numerically for...
Jet quenching phenomenon serves as a crucial signature of the Quark-Gluon Plasma, observed when hard-scattered partons interact with the hot, dense QCD medium created in high-energy heavy-ion collisions. In central heavy-ion collisions, however, distinguishing jets produced by hard scattering from those originating from combinatorial background is largely limited, especially for jets with low...
We study the energy deposition and thermalisation of high-momentum on-
shell partons (minijets) travelling through a non-equilibrium Quark-Gluon Plasma using QCD kinetic theory. For thermal backgrounds, we show that the parton energy first flows to the soft sector by collinear cascade and then isotropises via elastic scatterings. In contrast, the momentum deposition from a minijet reaches the...
The present work addresses the puzzle related to the observation of collective flow in collisions of small systems (which indicates the presence of a medium even in such collisions) and the absence of jet quenching in such systems (which would not be expected if jets are traversing a medium). This study has been done using the JEWEL event generator with a ``brick"-like medium. This simplified...
Energy-energy correlators (EECs) offer a novel way to study the structure of jets. Defined as the energy-weighted cross section of particle pairs inside jets, the correlation strength as a function of the pair opening angle allows a distinct separation of the perturbative and non-perturbative regimes. The evolution of parton dynamics in jets to their confinement into hadrons can be studied. We...
The purpose of this study is to elucidate the parton energy loss mechanism depending on path-length within the quark-gluon plasma (QGP) medium. In relativistic heavy ion collision experiments, it is difficult to directly observe the QGP because of its short life time and small size. Detecting a high momentum parton which passes through the QGP provide information of the QGP properties via the...
In this work, we perform computations of inclusive jet and semi-inclusive jet-hadron cross sections for minimum-bias oxygen-oxygen collisions. We compute the no-quenching baseline for the jet nuclear modification factor $R_{AA}$ and jet-, and hadron-triggered semi-inclusive nuclear modification factors $I_{AA}$. We do this with state-of-the-art nuclear parton distribution functions, NLO matrix...
Due to the longer relaxation time of heavy quarks compared to light quarks in the quark-gluon plasma, the non-equilibrium information is expected to be retained in the final momentum distribution of heavy flavors, making them suitable probes of the strongly interacting system. Using the Gribov-Zwanziger prescription to model the infrared behavior of QCD, we study the momentum diffusion...
Generative AI that is data-driven and self-supervising has shown significant potential to transform both science and industry. In this talk, we present two novel applications of generative AI in heavy ion experiments.
- The first application involves full-detector, whole-event simulation of heavy ion collisions using denoising diffusion probabilistic models (DDPMs). Our studies [in...
The production of spectator neutrons depends sensitively on the distribution of neutrons within a nucleus. In this talk we describe a relatively complete model that takes into account clusters forming among the spectators (charged or uncharged), the decay of such clusters using the Gemini code and lastly secondary neutrons produced by particpant nucleons. With this model we calibrate our...
Top quarks, the heaviest elementary particles carrying colour charges, are considered to be attractive candidates for probing the quark-gluon plasma pro- duced in relativistic lead-lead collisions. In proton-lead collisions, top-quark production is expected to be sensitive to nuclear modifications of parton distri- bution functions at high Bjorken-x values. In Run 2, the ATLAS experiment...
Jets originating from hard-scattered partons in the early stages of heavy-ion collisions travel through the Quark Gluon Plasma (QGP) and are modified or quenched relative to a $p$+$p$ collision baseline. Moments of the jet's transverse momentum ($p_{\rm T}$) profile in the $\eta-\phi$ plane relative to the jet-axis are an important class of jet substructure observables to study in medium...
The NA60+ experiment, proposed for data taking from 2029, aims at studying the high $\mu_{\rm B}$ region of the QCD phase space diagram. It will make use of the high intensity of CERN SPS beams, and detect rare probes via a beam-energy scan with Pb-Pb and p-A collisions in the interval $6.3 <\sqrt{s_{\rm {NN}}} < 17.3$ GeV.
In this talk, we will focus on the prospects for measurements of...
Photons and correlated electron-positron pairs (dielectrons) are the ideal probes to study the properties of the medium created in relativistic heavy-ion collisions. They are produced in all stages of the collision and leave the system with no loss of information as they do not interact strongly with the medium. However, at LHC energies, the thermal dielectrons emitted in the early stages of...
The sPHENIX experiment has been taking data since 2023 at the Relativistic Heavy Ion Collider(RHIC) at Brookhaven National Laboratory, USA. We aim to study the properties of the Quark-Gluon Plasma.
The INTT consists of two cylindrical layers of silicon detectors that can precisely measure the passage positions of charged particles. By using the collision point (vertex) of ions and the...
The measurement of dijets in proton-lead collisions at the LHC provides unique possibilities to investigate both nuclear and nucleon initial state effects as a function of the parton scattering kinematics. In particular, color fluctuations can significantly change the average interaction strength of the proton, biasing both the event activity and the number of wounded nucleons in the Pb...
Comparisons of jet production in Pb--Pb collisions compared to pp collisions at LHC energies provide vital information on both jet quenching in the quark-gluon plasma (QGP) and on the medium response to the jet. Jet quenching models with a hydrodynamic medium response predict an enhancement of soft particle production at large angles from the jet axis. However, the mechanism of soft particle...
We develop an effective field theory (EFT) formalism to study the interaction of a heavy quark with the medium. All the operators consistent with the underlying symmetry and power counting in $l_{\text{hydro}}$, the hydrodynamic length scale, are written down. Using these EFT principles leads to only few general operators which are organized in terms of order of importance. The Wilson...
$N$-point energy correlators are currently attracting both theoretical and experimental interest, as they can be calculated to high order accuracy in perturbation theory and capture many different features contributing to the substructure of jets. The energy-energy correlator (EEC), or two-point correlator, which emphasise the angular structure of the energy flow within jets, allow for a...
Measurements of neutral meson production cross sections in proton-proton (pp) collisions at LHC energies are important as a reference for heavy-ion studies and to test our understanding of QCD. At high transverse momenta ($p_{\rm T}$) where pQCD is applicable these measurements can be used to constrain model calculations. At low momenta, the production rates of neutral mesons are crucial...
In proton-proton (pp) collisions, beauty quarks are produced in hard scattering processes, and therefore their measurements represent an important test of perturbative QCD calculations. Moreover, measurements in pp collisions are needed to provide a baseline for those performed in p--Pb and Pb--Pb collisions. In addition, the production yields as a function of charged-particle multiplicity can...
Jet measurements have long established that as hard scattered partons traverse the quark gluon plasma (QGP) they lose energy resulting in modified jets in A+A collisions relative to p+p collisions with no QGP. Understanding how the jets, their constituents and substructure are modified is crucial to discriminating between energy loss models and extracting the in-medium transport properties....
Quarkonium production is one of the golden probes to study the quark–gluon plasma (QGP). Among many observables, the measurement of azimuthal anisotropies in their production sheds light on the collective behavior of particles in a strongly interacting medium. In particular, the magnitude of the elliptic flow measured at the LHC is interpreted as a signature of the charm-quark thermalization...
Suppression of open heavy flavor quarks and quarkonia in heavy-ion collisions are among the most informative probes of quark-gluon plasma (QGP). Interpreting the full wealth of data obtained from the collision events requires a precise theoretical understanding of the evolution of heavy quarks and quarkonia as they propagate through strongly coupled plasma.
Such calculations require the...
Open charm production is a sensitive probe of both hot and cold nuclear
matter effects. Charm meson production provides strong constraints on nuclear
parton distributions, while charm baryon and strange charm hadron production
can be used to probe strangeness- and baryon-enhancing hot QCD effects, re-
spectively. The LHCb detector is designed to study heavy flavor hadrons at the
LHC,...
The Multi-Purpose Detector (MPD) serves as the main experiment of the NICA complex under construction at JINR. With heavy-ion collisions in the energy range $\sqrt{s_{NN}}=4-11$ GeV, the MPD will scan the baryon-reach region of the QCD phase diagram to look for the first order phase transition and critical end-point. The measurement of direct photon and neutral meson production plays an...
In preparation to the LHC Run3, the LHCb gaseous fixed-target, SMOG,
was upgraded to offer higher instantaneous luminosity by up to two orders of
magnitude with respect to Run2, new gases, including non-noble ones such
as hydrogen, and an increased experimental accuracy. Since 2022, LHCb is
working with two independent collision points and as a collider and a fixed-target
experiment...
Strange hadron production provides information about the hadronization
process in high-energy hadron collisions. Strangeness enhancement has been
interpreted as a signature of quark-gluon plasma formation in heavy-ion col-
lisions, and recent observations of strangeness enhancement in small collisions
systems have challenged conventional hadronization models. With its forward
geometry and...
The LHCb detector’s forward geometry provides unprecedented access to
the very low regions of Bjorken x inside the nucleon. LHCb is able to study
charged and neutral light hadron production, as well as relatively rare probes
such as heavy quark. These data provide unique constraints on nuclear parton
distributions. This contribution will discuss recent LHCb measurements sensi-
tive to the...
In heavy-ion collisions, jets can serve as a probe of the hot QCD medium, since they are produced in hard scatterings early in the collision and traverse and interact with the hot medium. Measuring jets at low transverse momentum and large $R$ in the complex environment of central Pb--Pb collisions is a challenging task, due to the large background for the underlying event. In order to be...
In two-particle angular correlation measurements, jets give rise to a near-side peak formed by particles associated with a higher $p_\mathrm{T}$ trigger particle. Measurements of these correlations as a function of pseudorapidity and azimuthal differences are used to extract the centrality and $p_\mathrm{T}$ dependence of the shape of the near-side peak in the $p_\mathrm{T} $ range $3 <...
Quarks and gluons, normally confined within hadrons by strong interactions, are released from the confinement at high temperatures and densities, which is called Quark-Gluon Plasma (QGP). To understand QGP, high-energy heavy ion collision experiment has been conducted in laboratory and research has been carried out to investigate its property. One unknown about QGP is that it reaches thermal...
Charmonia, such as the J/$\psi$ and $\psi$(2S) mesons, are important probes of the quark-gluon plasma (QGP). The measurement of their nuclear modification factor, elliptic and triangular flow can provide strong constraints for the mechanism of in-medium energy loss. In this talk, results on the relative J/$\psi$ and $\psi$(2S) modification, based on the pp and PbPb data collected at...
We present SUBA-Jet, a newly constructed framework for jet and medium production in heavy-ion collisions at ultra-relativistic energies [1]. The framework is developed in a spirit similar to JETSCAPE, and our aim is to simulate the complete dynamics of heavy-ion collisions, with jet and medium hadron production combined.
The development of a jet starts with a seed parton with high virtuality,...
The parton-flavour-dependent properties of the $1\rightarrow2$ splitting processes underpinning parton showers can be uniquely explored using heavy-flavour jets. In this talk, we report a series of charm-tagged jet substructure measurements, using jets tagged with a reconstructed $\rm{D}^{0}$ meson. Using the newly collected Run 3 data, these measurements span a large range of jet transverse...
There is remarkable spin polarization phenomenon in the quark-gluon plasma produced in relativistic heavy ion collisions. The experimental detectable polarization of the vector mesons and spin polarization of the Λ hyperons provides important evidence for this spin polarization phenomenon. So far, there is still sign problem in theories to interpret the experimental results of local...
The Drell-Soding process, non-resonance pair production through photon-nuclear interaction plays a vital role in the exclusive $\pi^{+}\pi^{-}$ pair mass profile description. Among the products of photon-nuclear interactions, the continuum $\pi^{+}\pi^{-}$ pairs are directly produced in addition to decays of photoproduced $\rho^{0}$. Previous measurements and the widely utilized Monte Carlo...
In the context of study of QCD phase diagram, the possibility of inhomogeneous chiral condensed phase in low-temperature and high-density regions has been discussed using the low-energy effective theory of QCD such as the Ginzburg-Landau theory, the Nambu-Jona-Lasinio model and so forth. In such a phase, the lepton production rates may change compared to those of homogeneous chiral condensed...
The early time dynamic which connects the far-from-equilibrium matter created after the high energy collision toward the hydrodynamic regime is still a poorly understood process. We constructed a parton cascade model based on the hadronic transport model SMASH in order to explore this phase since SMASH has been shown to be able to correctly simulate multiparticle interaction in the hadronic...
sPHENIX is a new experiment at the Relativistic Heavy Ion Collider (RHIC), designed with large-acceptance, hermetic EM and hadronic calorimeters to enable qualitatively new measurements of jet probes of the QGP at RHIC. Since jets in heavy ion collisions sit on top of large fluctuating backgrounds, these must be understood to carry out a precision program of jet physics. This talk reports a...
We have calculated all the T-even photon transverse momentum dependent parton distribution functions (TMDs) using light front wave function. For this work, we have considered photon as a Fock-state of quark antiquark pair. All the $9$ T-even TMDs have been presented in the overlap and explicit form of light front wave function. We have found that our result arecoming similar to basic light...
In this talk we discuss using the X-SCAPE Monte Carlo event generator and Hybrid Hadronization to simulate particle production in a large variety of collision systems. New capabilities have been added to X-SCAPE to calculate deep inelastic scattering in $e+p$ collisions. Hybrid Hadronization combines quark recombination, applicable when distances between partons in phase space are small, and...
