Conveners
Parallel Session T11: Heavy flavors, quarkonia, and strangeness production: I
- Marek Kowalski (Polish Academy of Sciences (PL))
Parallel Session T11: Heavy flavors, quarkonia, and strangeness production: II
- Joerg Aichelin (Subatech/CNRS)
Parallel Session T11: Heavy flavors, quarkonia, and strangeness production: III
- Enrico Scomparin (Universita e INFN Torino (IT))
Parallel Session T11: Heavy flavors, quarkonia, and strangeness production: IV
- Elena Bratkovskaya
In this contribution, the final measurements of the centrality dependence of $R_{\rm AA}$ of non-prompt $\mathrm{D}^0$ and electrons from beauty hadron decays in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV will be presented. These measurements provide important constraints to the in-medium mass-dependent energy loss and hadronization of the beauty quark. The integrated non-prompt...
Evidence for the production of top quarks in heavy ion collisions is reported in a data sample of lead-lead collisions recorded in 2018 by the CMS experiment at a nucleon-nucleon center-of-mass energy of $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV, corresponding to an integrated luminosity of $1.7\pm0.1\,\mathrm{nb}^{-1}$. Top quark pair ($\mathrm{t\bar{t}}$) production is measured in events with...
We make predictions for rapidity densities of beauty hadrons produced in Pb-Pb collisions at LHC energy. The approach follows that outlined for charm in JHEP 07 (2021) 035, with the canonical suppression as an important ingredient. The hadronic mass spectrum is taken from PDG 2020, with 48 b mesons and 46 b baryons in total. As further input we use the measured cross section for...
In this contribution the nuclear modification factor ($R_\mathrm{AA}$) of prompt charm hadrons and heavy-flavour hadrons decaying to leptons measured in Pb-Pb collisions at $\sqrt{s_\mathrm{NN}}=5.02$ TeV by the ALICE Collaboration are presented. The measurement of heavy-flavour leptons in Xe-Xe collisions is also discussed. Heavy quarks are a very suitable probe to investigate the quark-gluon...
Open heavy-flavor hadron production, azimuthal anisotropy and correlations in heavy-ion collisions serve as powerful tools to study quark-gluon plasma (QGP) properties, heavy-flavor energy loss due to interaction with QGP, and heavy-flavor hadronization.
This talk presents recent ATLAS results on the azimuthal anisotropy ($v_2$ and $v_3$) and nuclear modification factor ($R_\mathrm{AA}$),...
Because of the different binding energies, bottomonium mesons are particularly useful probes to understand the thermal properties of quark-gluon plasma. Previously, CMS observed the sequential suppression of $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) in heavy ion (AA) collisions, which was widely accepted as evidence for the QGP formation. However, the $\Upsilon$(3S) yield was...
The recently discovered abundance of hadrons with more than three valence quarks remains poorly understood. Measurements of these exotic hadrons and their interactions with the QCD medium provides a new avenue to investigate their properties. Additionally, the production of hadrons with more than three quarks presents new testing grounds for models of particle transport and recombination in...
Heavy quarks are one of the most important probes to study the properties of quark-gluon plasma (QGP). Hadronization of beauty quarks is not as well understood as in the charm sector. Illuminating the hadronization mechanism is crucial for extracting the transport properties of the QGP. We present new results on nuclear modification factors of $B^0_s$ and $B^+$ mesons and their yield ratios in...
In this contribution, we present the latest measurements of $\mathrm{D}^0$, $\mathrm{D}^+$ and $\mathrm{D_s}^+$ mesons together with the final measurements of $\Lambda_\mathrm{c}^+$, $\Xi_\mathrm{c}^{0,+}$, $\Sigma_\mathrm{c}^{0,++}$, and the first measurement of $\Omega_\mathrm{c}^0$ baryons performed with the ALICE detector at midrapidity in pp collisions at $\sqrt{s}=5.02$ and $\sqrt{s}=13$...
Being a powerful probe of the quark-gluon plasma (QGP), charm quarks have been widely studied in heavy-ion collisions. They have provided unique insights into the parton energy loss and the degree of thermalization in the hot medium, but an inadequate knowledge of the hadronization processes has hampered the interpretation of experimental results. In heavy-ion collisions, charm hadron...
Measurements of bottomonium states in heavy-ion collisions provide a powerful tool to study both initial-state effects on heavy-quark production and final-state interactions between heavy quarks and the quark-gluon plasma (QGP).
The ATLAS experiment at LHC has measured the production of bottomonium states $\Upsilon$(1S), $\Upsilon$(2S) and $\Upsilon$(3S), in Pb+Pb and $pp$ collisions at a...
Partons (quarks/gluons) in heavy-ion collisions interact strongly with the Quark-Gluon Plasma (QGP), and hence have their energy and shower structure modified compared to those in vacuum, e.g., those produced in proton-proton collisions. Theoretical calculations predict that radiative energy loss, which is the dominant mode of energy loss for gluons and light quarks in the QGP, is suppressed...
In recent years, a significant theoretical effort has been made towards a dynamical description of quarkonia inside the Quark-Gluon Plasma (QGP), using the open quantum systems formalism. In this framework, one can get a real-time description of a quantum system (here the quarkonium) in interaction with a thermal bath (the QGP) by integrating out the bath degrees of freedom and studying the...
Measurements of the correlations of the final-state heavy flavor hadrons are of great interest since they provide information about the initial collision geometry and its fluctuation. More importantly, those measurements could reveal the mass dependence of parton energy loss and quark diffusion in the Quark-Gluon Plasma (QGP). In this talk, we report the first measurement of the azimuthal...
Charmonium production is a direct probe of deconfinement in heavy-ion collisions. For J/$\psi$, a bound state of ${c}\bar{c}$ quarks, its (re-)generation within the QGP or at the phase boundary, is found to be the dominant production mechanism at low transverse momentum ($p_{\rm T}$) and in central Pb–Pb collisions at the LHC energies. The relative production of the $\psi$(2S) excited state...
Charm and bottom 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 B mesons, open charm hadrons and...
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...
Nearly twenty $c\bar{c}$ pairs are produced in central Au+Au collisions at
the top RHIC energy of $\sqrt{s_{NN}}=$200 GeV, with the largest yields at
mid-rapidity. The enhanced production of charmonium states from combinations of independently produced charm quarks could contribute to the observation that, in Au+Au collisions at RHIC, J/$\psi$ yields are smaller at forward rapidity than at...
Quarkonia and open-charm hadrons are important probes to study the properties of the Quark-Gluon Plasma (QGP). Heavy quarks are produced predominantly in hard partonic scatterings at the very early stage of heavy-ion collisions, and subsequently experience the whole evolution of the hot and dense medium. Measurements of quarkonia and open charm hadron production yields and $J/\psi$ anisotropic...
