Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session CK: Mini-Symposium on Recent Results and Future Prospects of Heavy Flavor Physics |
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Chair: Ramona Vogt, Lawrence Livermore National Laboratory Room: City Center B |
Thursday, October 26, 2017 8:30AM - 9:06AM |
CK.00001: Heavy flavor production in p$+$p and A$+$A collisions Invited Speaker: Zhongbo Kang The production of heavy flavor mesons and heavy quarkonium in p$+$p collisions provides unique opportunities to explore the dynamics of the strong interaction. Their production and hadronization mechanism in vacuum and in the quark-gluon plasma are among the most outstanding questions in QCD. We review recent theoretical progress along this direction, highlighting several selected topics such as heavy meson or quarkonium production inside jets, production and polarization of heavy quarkonium in Non-Relativistic QCD and Color Evaporation Model, as well as the medium modification of heavy mesons in heavy ion collisions, and etc. [Preview Abstract] |
Thursday, October 26, 2017 9:06AM - 9:18AM |
CK.00002: Data-driven analysis of the temperature and momentum dependence of the charm quark diffusion coefficient Yingru Xu, Marlene Nahrgang, Jonah Bernhard, Shanshan Cao, Steffen Bass Heavy quarks (charm and bottom) have been considered as valuable probes of the QGP medium created in heavy-ion collisions. The interaction strength between heavy quarks and the medium, commonly characterized by their diffusion coefficients, is not directly measurable, but can be estimated by comparison between theoretical model calculations and experimental data on observables such as elliptic flow and nuclear modification factor. In this work, we conduct a data-driven model-to-data analysis to systematically and quantitatively study the evolution of heavy quarks in the QGP medium. We start by proposing a generalized ansatz for the heavy quark diffusion coefficient, then subsequently calibrate our model calculation to the experimental data utilizing a modern Bayesian analysis. We then are able to extract the functional form (with quantified uncertainties) of the transport coefficients. Our model can simultaneously describe the experimental data of $D$-meson $R_{AA}$ and $v_2$ for different collision systems at both RHIC and LHC, utilizing our extracted diffusion coefficients. It is found that the heavy quark spatial diffusion coefficient has a non-trivial temperature dependence at low momentum and converges to the pQCD calculation in the intermediate/high momentum region. [Preview Abstract] |
Thursday, October 26, 2017 9:18AM - 9:30AM |
CK.00003: Studies of the heavy flavor production with the Forward Vertex Silicon Detector at PHENIX Matthew Durham Because of their large mass, c/b quarks are expected to lose less energy through gluon radiation than lighter quarks in the Quark Gluon Plasma (QGP). PHENIX has measured the production of non-prompt $J/\psi$ from $B \rightarrow J/\psi$ decays through the dimuon channel at forward and backward rapidities in 510/200 GeV $p$+$p$ and 200 GeV Cu+Au collisions. The analysis of distance of closest approach of muons from the $B$ meson decay using the Forward Silicon Vertex Detector (FVTX) was used for these measurements. The PHENIX results, along with the ones from Tevatron and LHC, show a smooth increase of bottom production with center of mass energy in $p$+$p$ ($p$+$\bar{p}$) collisions from 0.2 to 13 TeV, Next-to-leading order perturbative Quantum Chromodynamics (NLO pQCD) predictions are consistent with the data. The $B$ hadron production in Cu+Au collisions is found to be consistent with the binary scaling in $p$+$p$ collisions and recent nuclear parton density functions (nPDF). The status of the forward non-prompt $J/\psi$ production in 200 GeV Au+Au collisions and the ongoing analysis of charm/bottom decayed single muons in $p$+$p$, Cu+Au and Au+Au collisions at PHENIX to explore the mass/flavor dependent parton energy loss in the QGP will be presented in this talk. [Preview Abstract] |
Thursday, October 26, 2017 9:30AM - 9:42AM |
CK.00004: ABSTRACT WITHDRAWN |
Thursday, October 26, 2017 9:42AM - 9:54AM |
CK.00005: Suppression of Upsilon excited states in PbPb collisions at sqrt(s)=5.02 TeV with CMS Manuel Calderon de la Barca Sanchez We discuss measurements of Upsilon production in PbPb collisions collected with the CMS experiment at a center-of-mass energy of 5.02 TeV. We have measured the excited states and ground state in both PbPb and pp collisions at the same energy. We summarize the results of analyses on the double ratio of excited states to the ground state in both collision system and on the nuclear modification factor, $R_{AA}$, of Upsilon states. A large suppression is observed for all states, with the higher excited states showing smaller $R_{AA}$, and compare the results to model calculations. [Preview Abstract] |
Thursday, October 26, 2017 9:54AM - 10:06AM |
CK.00006: Quarkonium production in Pb-Pb collisions with ALICE Edmundo Garcia-Solis The Heavy-ion collisions at the Large Hadron Collider (LHC) provide a unique opportunity to study the properties of matter at extreme energy densities where a phase transition from hadronic matter to a deconfined medium of quarks and gluons, the Quark-Gluon Plasma (QGP) is predicted. Among the probes of the QGP, heavy quarks play a crucial role since they are created during the initial stages of the collision, before the QGP formation. The sequential suppression of the quarkonium states was suggested as a signature of the QGP. Later, a regeneration of quarkonia by recombination of deconfined quarks was also predicted. The first results on quarkonium suppression in Pb-Pb collisions at the LHC seem to indicate that for charmonia both regeneration and suppression mechanisms play a role, while for bottomonia the regeneration mechanism should be small. The momentum space azimuthal anisotropy of charmonium production provides important information on the magnitude and dynamics of charmonium suppression and regeneration mechanisms. ALICE measures quarkonia at mid-rapidity in the dielectron decay channel and at forward rapidity in the dimuon channel, both down to zero transverse momentum. Single- and multi-differential measurements of quarkonium nuclear modification factor and J/psi elliptic flow in Pb-Pb collisions at 5.02 TeV as a function of centrality, transverse momentum and rapidity will be presented. Comparisons to measurements at different collision energies and theoretical calculations will be discussed. [Preview Abstract] |
Thursday, October 26, 2017 10:06AM - 10:18AM |
CK.00007: Precision bottom physics program at sPHENIX with inner vertex detector upgrade Xuan Li The planned sPHENIX experiment at RHIC aims to study the microscopic nature of strongly interacting matter ranging from nucleons to the quark-gluon plasma (QGP) with high precision measurements of jets and heavy flavor observables for a wide selection of nuclear collision systems. In particular, the bottom quark is expected to be produced in a hard scattering before the QGP creation in heavy ion collisions and experience the medium throughout its evolution. The observables of bottom quark tagged jets (b-jets), bottom hadrons and their correlations at sPHENIX cover a wide kinematic range of the bottom probes. The sPHENIX measurements are complementary to the studies at the LHC, experiencing less fraction of bottom production via gluon splitting and probing QGP of different properties. Such measurements are essential for our understanding of the bottom quark energy loss mechanisms and transport properties of the QGP medium. To achieve these goals, the sPHENIX collaboration proposed to utilize a state of the art silicon vertex detector based on the Monolithic-Active-Pixel-Sensor (MAPS) technology. The detector design, physics reach and the status of detector R&D will be presented. [Preview Abstract] |
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