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 L04: Heavy Quarkonia as a Probe of Hot and Cold QCD Media: Current and FutureInvited Live
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Sponsoring Units: DNP Chair: Kirill Tuchin, Iowa State University |
Sunday, April 18, 2021 3:45PM - 4:21PM Live |
L04.00001: Quarkonia and heavy quarks as a probe of QCD Media Invited Speaker: Nora Brambilla Heavy particles are good probes of a strongly interacting hot medium. In particular quarkonia are endowed with a hierarchy of energy scales related to their nonrelativistic dynamics, the scale of the mass, of the momentum transfer, of the binding energy plus the scale of nonperturbative physics that make them to a unique probe of the Quark Gluon Plasma. In this talk, I will show how, putting together a nonrelativistic effective field theory and an open quantum system description, we can use the in medium nonequilibrium evolution of quarkonia with small radius to investigate and characterize the properties of the QGP in terms of two nonperturbative parameters: the heavy quark transport coefficient and its dispersive counterpart. We obtain a Lindblad equation in potential Non Relativistic QCD that fully accounts for the quantum and non-Abelian nature of the system. By solving this equation using the highly efficient Monte Carlo wave-function method and realistically implementing it through a 3+1D dissipative hydrodynamics code, we obtain the bottomonium nuclear modification factor and compare with the most recent LHC data. The computation does not rely on any free parameter, as it depends on the two transport coefficients that have been evaluated independently in lattice QCD. Our final results, which include late-time feed down of excited states, agree well with the available data from LHC 5.02 TeV PbPb collisions. [Preview Abstract] |
Sunday, April 18, 2021 4:21PM - 4:57PM Live |
L04.00002: Bottomonium suppression in an open quantum system using the quantum trajectories method Invited Speaker: Michael Strickland I present results of recent numerical solution of the Lindblad equation describing the Brownian motion of a Coulombic heavy quark-antiquark pair in a strongly coupled quark-gluon plasma. The method makes use of a highly efficient Monte Carlo wave-function (quantum trajectory) algorithm. The Lindblad equation and associated collapse operators have been derived in the framework of pNRQCD and fully takes into account the quantum and non-Abelian nature of the system. The hydrodynamics of the plasma is realistically implemented using a 3+1D dissipative hydrodynamics code. As I will demonstrate, our final results, which include late-time feed down of excited states, agree well with the available data from LHC 5.02 TeV PbPb collisions. [Preview Abstract] |
Sunday, April 18, 2021 4:57PM - 5:33PM Live |
L04.00003: Modelling the Propagation of Heavy Quarks and Interactions of Quarkonia with the Hot QCD Medium Invited Speaker: Weiyao Ke Heavy quarks are perturbatively produced in high-energy nuclear collisions and directly probe the dynamics of flavor diffusion in the quark-gluon plasma (QGP) medium created in such collisions. Quarkonia, bound states of heavy quark and anti-quark pair under the strong interaction, are sensitive to another intriguing medium property: the color screening in QGP, which induces quarkonia dissociation and suppresses the yield of the bound-state production. The dynamics of quarkonia is closely related to heavy quark transport, as heavy-quark pairs can recombine into quarkonia during the evolution, which is an enhanced contribution in high-energy collisions of large nuclei. Therefore, it is demanding to develop a consistent theoretical framework involving both heavy quark and quarkonia to unravel the information in heavy-sector measurements. We review recent developments in this endeavor: dissociation and regeneration of quarkonia are coupled with the evolution of heavy quarks, including elastic collisions and gluon emissions. We discuss the simultaneous understanding of medium modifications to the inclusive measurement of open heavy flavor and quarkonia production. With these developments, one aims to pin down the flavor diffusion parameter and color screening properties of the QGP using future precision measurements of the heavy-sector in nuclear collisions at RHIC and LHC. Finally, in addition to inclusive observables, we also discuss the prospect of study heavy flavor and quarkonia production in the context of jets, especially, how these massive particles help us understand hot QCD medium modifications to jet dynamics. [Preview Abstract] |
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