In heavy-ion collisions, charm hadron production can occur via coalescence, where charm quarks combine with the surrounding light quarks in the QGP. The relative coalescence contribution is expected to be more significant for hadrons with a larger number of constituent quarks. Such an effect will contribute to the modification of the baryon-to-meson ratio in heavy-ion collisions, compared to...
Freeze-out scenarios with separate freeze-out hypersurfaces for strange and non strange hadrons have been shown to successfully resolve the proton anomaly at the LHC and further improve the description of hadron yields across beam energy. These studies suggest that data favors an early freeze-out of strangeness. Such studies have been so far restricted within the framework of the hadron...
In 2023, the sPHENIX experiment will begin collecting data which will include the largest recorded sample of b-hadron decays from Heavy Ion collisions at RHIC. This sample will allow for precision charm and beauty studies, part in thanks to the excellent vertexing of the MVTX detector, the timing of the INTT, and precision of the TPC along with the calorimetry system. The sPHENIX collaboration...
Top-quarks, tau leptons, and Higgs boson are the only elementary particles that have not been observed in heavy-ion collisions in the ATLAS detector yet. In particular top quarks, the heaviest elementary particles carrying colour charges, have been argued to be attractive candidates for probing the quark-gluon plasma produced in heavy-ion collisions. In proton-lead collisions, top-quark...
We present the progress of reconstructing the fragmentation functions of the charmed mesons, X(3872), $\psi(2S)$ and $\Upsilon$ within reconstructed jets. The charmed mesons were measured within reconstructed anti-k$_{T}$ jets with R=0.5 in the $p_{T}$ range of 5 to 40GeV. The data stem from pp collisions at 13 TeV measured by the LHCb detector. The z$_{T}$ distributions of the mesons are...
The $\Xi_c^+$ baryon is an open charm state comprised of an up, strange, and charm quark. For its peculiar composition with the presence of the strange quark, studies of baryon-to-baryon ratio of $\Xi_c^+$ to $\Lambda_c^+$ can provide valuable information on charm hadronization mechanisms, and possibly observe strangeness enhancement in small systems. We present the first study of...
Coalescence hadronization in QGP would enhance $\Lambda^+_c$/$D^0$ at intermediate $p_T$ and are supposed to occur in PbPb collisions.
The charmed baryon to meson ratio, $\Lambda^+_c$/$D^0$ ratio is sensitive to hadronization, can provide important information on the charm hadronization process and formation of QGP.
Prompt $\Lambda^+_c$/$D^0$ ratio are measured in peripheral PbPb collisions...
The enhanced production of strangeness was first proposed as a signature of the quark gluon plasma creation in heavy ion collisions. Recently, increased strangeness production is also observed experimentally in high multiplicity small systems such as pp and pPb collisions, where formation of QGP is not expected. In this study, production of prompt $D^+$ and $D_s^+$ in $p$Pb collisions is...
Open charm hadrons are collected by the LHCb detector in proton-lead collisions at $\sqrt{s_{NN}}$=5.02 TeV. The excellent performance of particle reconstruction and identification in forward rapidity acceptance allows these charm states to be studied down to very low transverse momentum. This poster presents the LHCb measurement of the production of charm mesons, reconstructed in exclusive...
HADES investigates the moderate temperature and high density regime of the QCD phase diagram. Strangeness can give a direct insight into the created dense matter, in particular close to the nucleon nucleon production threshold. In 2019 HADES collected Ag+Ag collisions at 1.58$A$ GeV kinetic beam energy. A newly installed electromagnetic calorimeter allows for photon detection. Furthermore the...
We discuss the dynamical evolution of charm quark elastic energy loss in a bulk medium at fixed temperature $T$ extending the Boltzmann (BM) collision integral to include off-shell dynamics. We show the results on the transport coefficients and the time evolution of charm quark making a comparison among the Langevin dynamics, the BM collisional integral within a Quasi-Particle Model(QPM)...
Ultra-relativistic heavy ion collisions are expected to generate a huge electromagnetic (e.m.) field that is envisaged to induce several effects on hot QCD matter including the possibility of local parity and local parity and charge conjugation symmetry violations. A direct signature of such e.m. fields and a first quantitative measurement of its strength and lifetime are still missing.
We...
We extract the heavy quark momentum diffusion coefficient $\kappa$ during the bottom-up thermalization scenario using effective kinetic theory simulations. We compare our nonequilibrium results to the gluonic thermal value for the same energy density, screening mass and infrared temperature. When matching the equilibrium and nonequilibrium systems for the same infrared temperature, we find an...
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....
Transverse mass scaling has been observed for a wide range of particle
species in $pp$ collisions at various energies from the SPS to RHIC and
the LHC. The observed scaling is different for baryons and mesons, and
in this work, we present a comprehensive study of the $m_{T}$-scaling at
LHC energies also extended to the heavier mesons. The study reveals a
systematic pattern in the scaling...
