Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session X14: Heavy Flavor and Quarkonia as a Probe of QCD Media, Current and Future – ILive Mini-Symposium
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Sponsoring Units: DNP Chair: Ramona Vogt, LLNL/UC Davis |
Tuesday, April 20, 2021 10:45AM - 11:21AM Live |
X14.00001: What Heavy Flavor Has Taught Us About the QGP and What’s in Store for the Future Invited Speaker: Deepa Thomas In ultra-relativistic heavy-ion collisions a hot and dense QCD matter, called Quark- Gluon Plasma (QGP), is produced. Heavy quarks (charm and beauty) are powerful probes to investigate the production and properties of the QGP. They are produced in hard scattering processes with large momentum transfer before the formation of the QGP, thus experiencing the full evolution of the system. The partons transversing the QGP undergo energy loss by collisional and radiative processes. The dependence of these processes on the mass and color charge of partons can be studied with charm and beauty quarks. Furthermore, quarkonia, which are bound states of heavy flavor quarks and their anti-quarks are of particular interest for the understanding of the deconfined QGP, as they exhibit unique features like the recombination of quark and anti-quark due to their abundance at LHC energies. In this talk, I will present a review of the most recent open heavy-flavour hadron and quarkonia measurements at RHIC and at the LHC. I will discuss what we have learnt from these results, and project future prospects. [Preview Abstract] |
Tuesday, April 20, 2021 11:21AM - 11:33AM Live |
X14.00002: Disentangling cold nuclear matter effects through open heavy-flavour production in p-Pb and pp collisions Maria Vittoria Garzelli, Michael Benzke, Bernd Kniehl Data on open and hidden heavy-flavour production in high-energy heavy-ion collisions have traditionally been considered as a precious source of information regarding the onset of a Quark-Gluon-Plasma phase and its properties. A precise understanding of cold nuclear matter effects is however crucial to extract firm conclusions on many hot nuclear matter aspects. By means of a General-Mass Variable-Flavour-Number-Scheme framework capable of simulating both $pp$ and $pA$ collisions using, as far as possible, consistent input and undelying theoretical assumptions, we investigate up to which extent relevant theoretical uncertainties affecting the $pp$ case propagate to the $pA$ case and we critically revise the possibility that the data on open heavy-flavour production in $p$Pb collisions recently collected at the Large Hadron Collider, in conjunction with those in $pp$ collisions, can be used to infer accurate constraints on cold nuclear matter effects. [Preview Abstract] |
Tuesday, April 20, 2021 11:33AM - 11:45AM Live |
X14.00003: The Imaginary Part of the Heavy-quark Potential From Real-time Yang-Mills Dynamics Babak Salehi Kasmaei, Kirill Boguslavski, Michael Strickland The imaginary part of the heavy-quark potential is related to the total in-medium decay width of the quarkonium states. We extract the imaginary part of the heavy-quark potential using classical-statistical lattice simulations of the real-time SU(2) and SU(3) Yang-Mills dynamics in classical thermal equilibrium. We compare with the results from the continuum limit, lattice-regularized hard-classical-loop (HCL) perturbation theory and also previous nonperturbative calculations. We also discuss the relation of our results to the heavy-quark diffusion coefficient. [Preview Abstract] |
Tuesday, April 20, 2021 11:45AM - 11:57AM Live |
X14.00004: Heavy flavor physics with the sPHENIX MVTX vertex tracker upgrade Ming Liu The sPHENIX detector currently under construction at the Relativistic Heavy Ion Collider (RHIC) at BNL will measure a suite of unique jet, open heavy flavor and Upsilon observables with unprecedented statistics and kinematic reach at RHIC energies. ~A MAPS-based silicon pixel VerTeX detector upgrade to sPHENIX, the MVTX, will provide a precise determination of the impact parameter of tracks relative to the primary vertex in high multiplicity heavy ion collisions. The MVTX utilizes the latest generation of MAPS technology to provide precision tracking with high efficiency over a broad momentum range in the high luminosity p$+$p, p$+$Au and Au$+$Au collisions at RHIC. These new capabilities will enable precision measurements of open heavy flavor observables, covering an unexplored kinematic regime at RHIC, and shed new light to our understanding of heavy flavor production and interactions with nuclear medium. ~The physics program, its potential impacts, and recent detector development of the MVTX will be discussed in this talk. [Preview Abstract] |
Tuesday, April 20, 2021 11:57AM - 12:09PM Live |
X14.00005: Open heavy flavor and jet studies for the future Electron-Ion Collider Xuan Li The proposed high luminosity high energy Electron-Ion Collider (EIC) will provide a clean environment to precisely study the nuclear modification of the nuclear parton distribution functions (nPDFs) and hadronization processes within a wide x-$Q^{2}$ phase space. Heavy flavor hadron and jet measurements at the future EIC will allow us to better determine the nPDFs in the poorly constrained high Bjorken-x region and provide enhanced sensitivities to the nuclear transport properties in medium.Studies of flavor tagged hadrons or jets and their correlations at the EIC provide a unique path to explore the flavor dependent fragmentation functions and energy loss in heavy nuclei, which can constrain the initial state effects for previous and ongoing heavy ion measurements at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). Progresses of heavy flavor hadron and jet reconstruction in simulation and the corresponding physics projection such as the flavor dependent hadron nuclear modification factor in electron+nucleus collisions will be discussed in this presentation. Initial design and performance of a proposed forward (proton/nuclei going direction) silicon tracking detector, which is essential to carry out these measurements at the EIC will be shown as well. [Preview Abstract] |
Tuesday, April 20, 2021 12:09PM - 12:21PM Live |
X14.00006: Production and polarization of direct $J/\psi$ to ${\mathcal O}(\alpha_s^3)$ in the improved color evaporation model in collinear factorization Vincent Cheung, Ramona Vogt One of the best ways to understand hadronization in QCD is to study the production of quarkonium. The color evaporation model (CEM) and Nonrelativistic QCD (NRQCD) can describe production yields rather well but spin-related measurements like the polarization are stronger tests. In this talk, we will present the first calculation of quarkonium polarization in the improved color evaporation model (ICEM) by considering all diagrams at the order of $\alpha_s^3$ and integrating over all color states. [Preview Abstract] |
Tuesday, April 20, 2021 12:21PM - 12:33PM Live |
X14.00007: Quarkonia polarization and Quantum tomography Daniel Tapia Takaki, John Ralston, John Martens The polarization of quarkonia in proton-proton and heavy-ion collisions has recently received great attention. Both at RHIC and LHC, no sizable polarization has been observed for J/psi production in both pp and PbPb collisions. In pp collisions, NLO calculations based on the Color-Single Model and the Non-Relativistic QCD model cannot describe the data as a function of transverse momentum. In this talk, we provide for the first time a description of the data utilizing Quantum Tomography, which is a model independent method used to reconstruct the density matrix of the system. We use recent experimental measurements at RHIC and LHC to analyze the polarization parameters in a novel way. [Preview Abstract] |
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