Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session B10: Mini-Symposium: Heavy Flavor Production From Heavy Ion to Electron Ion CollisionsMini-Symposium
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Sponsoring Units: GHP DNP Chair: Christina Markert, University of Texas at Austin Room: Marquette I - 2nd Floor |
Saturday, April 15, 2023 10:45AM - 11:21AM |
B10.00001: Heavy flavor production and interaction from hot to cold QCD Invited Speaker: Krista L Smith The PHENIX detector at RHIC recorded heavy-ion data for sixteen years, recently ending its run in 2016. PHENIX has since been fully dismantled, with the new sPHENIX detector currently completing installation in the same location at RHIC. sPHENIX, projected to come online this spring, and the STAR experiment are expected to continue collecting heavy-ion data through 2025. Although PHENIX is no longer actively recording data, the last three years of running collected data across several different collision systems: p+p, p+Al, d+Au, and Au+Au. Similarly, the LHCb experiment at the LHC can also record data across a wide range of collision systems with SMOG, a unique fixed-target system installed for Run 2. New heavy flavor measurements from the LHC, including the ALICE and CMS experiments, can help shed light on hot versus cold nuclear matter effects and can be helpful to compare to RHIC energies. With preparations for the upcoming Electron-Ion Collider already underway, a new era of physics lies on the horizon. Interest in ultra-peripheral collisions is growing within the community, and vector mesons provide a cornerstone of the upcoming EIC heavy-flavor physics program. Here we will present an experimental summary of heavy flavor results from LHC and RHIC from p-p to p-A to A-A collisions and the transition into the EIC Program. |
Saturday, April 15, 2023 11:21AM - 11:33AM |
B10.00002: J/psi and D Meson Production by Intrinsic Charm Ramona L Vogt A nonperturbative contribution to charm production, intrinsic charm, has long been speculated, with much contradictory empirical evidence. LHCb recently reported evidence for intrinsic charm in $Z + { m jet}$ events at $sqrt{s} = 13$~TeV. While $J/psi$ production by intrinsic charm would normally only manifest itself outside the range of the LHC detectors, even at forward rapidity, the high $Q^2$ of these events allowed for their detection. On the other hand, at low center of mass energies, $J/psi$ and $D$ meson production by intrinsic charm could manifest itself at midrapidity, as described for the SeaQuest experiment at Fermilab. This talk will explore the rapidity and $p_T$ dependence of an intrinsic charm signature for laboratory beams of 40~GeV and higher, both in $p+p$ and $p+A$ interactions and place the results in context of previous experimental evidence. |
Saturday, April 15, 2023 11:33AM - 11:45AM |
B10.00003: Elliptic flow measurement of J/ψ in PHENIX Run14 Au+Au at √sNN = 200 GeV Luis Bichon The Quark Gluon Plasma (QGP) produced in relativistic heavy ion collisions exhibits a nearly perfect fluid behavior. This behavior is observed as strong azimuthal correlations between the produced particles, but presently, the detailed interactions of the heavy quarks in the QGP medium are under investigation. One such quantity of interest is flow, a measure of how energy, momentum, and number of particles may correlate with direction. The PHENIX experiment at RHIC has a unique coverage at forward rapidity (1.2 ≤ |η| ≤ 2.2) and a large sample of J/ψ → µ+ + µ− decays collected in 2014 in Au+Au collisions at 200 GeV. At such energies, in central collisions, this area of phase space yields the smallest fraction of charm anti-charm quark pairs when compared to midrapidity, where most pairs are produced. With such yields, charmonium coalescence a dominating source of J/ψ elliptic flow (v2) may not be present. We will present the first statistically improved measurement of pT-dependent J/ψ elliptic flow at RHIC energies at forward rapidity. |
Saturday, April 15, 2023 11:45AM - 11:57AM |
B10.00004: PHENIX Measurements of Azimuthal Anisotropy of Light and Heavy Flavor Hadrons in Au+Au Collisions at Forward Rapidity Brandon T Blankenship, Julia Velkovska One of the most prominent features of the quark gluon plasma is its near-perfect fluid behavior. An important outstanding question is establishing the degree to which heavy flavor particles flow with the bulk system. Measurements of the Fourier coefficient v2 of light and heavy flavor hadrons can provide insight into the properties of the medium. At low transverse momentum (pT) the mass dependence of v2 is associated with the common flow velocity in the bulk system, whereas at higher pT path length and mass dependencies in the energy loss play a role. We will present new results measured with the PHENIX muon arms covering 1.2<|η|<2.2 using high statistics Au+Au dataset collected in 2014. The v2 of light hadrons and muons from heavy flavor decays are measured in the range 0.5<pT<5 GeV/c and the results are compared to measurements at mid-rapidity. Forward rapidity samples different initial and final state effects than mid-rapidity, and therefore the produced particles may be subject to different pressure gradients. The measurements will be compared to theoretical calculations. |
Saturday, April 15, 2023 11:57AM - 12:09PM |
B10.00005: Investigating charm quark production in heavy ion collisions using ALICE at the LHC Josephina Wright Heavy quark energy loss is used to study the properties of a quark gluon plasma. We are investigating charm quark production in p-Pb events at LHC energies with the ALICE detector. We study the impact of heavy flavor quark energy loss via the heavy flavor hadron production with respect to a jet. The jet is identified through a high momentum hadron. An angular correlation is performed using an associated electron from heavy flavor decays. The time projection chamber (TPC) is used to identify electron candidates via differential energy loss (dE/dx), which focuses on low momentum charm production. Various background sources are investigated to define the purity of the electron sample. Different event multiplicities are used to study the onset of a possible medium in p-Pb collisions. First analysis results of 5.02 GeV p-Pb collisions will be presented. |
Saturday, April 15, 2023 12:09PM - 12:21PM |
B10.00006: Searching for J/ψ collective flow in 13 TeV pp collisions at CMS Mike Z Reynolds Quark gluon plasma (QGP) is an extremely hot, dense state of matter in which the quarks and gluons, normally confined to colorless hadrons, are temporarily deconfined. The QGP can be formed in high-energy nuclear collisions such as PbPb, and possibly in smaller systems such as pPb collisions. The question of how small a system can form a droplet of QGP is one of much experimental and theoretical interest. One way to probe the QGP is by measuring anisotropic flow, which manifests in long-range correlations between particles as the QGP droplet expands with anisotropic pressure gradients. It is expected that heavier particles will have little or no flow. The CMS collaboration at CERN has measured the flow of open and closed charm mesons and compared the values to those of lighter hadrons. They found the flow of J/ψ mesons to be similar to that of D0 mesons in both high multiplicity pPb and PbPb collisions. While the open heavy flavor mesons may acquire flow because they contain light quarks that equilibrate in the medium, for J/ψ to flow the charm quarks needs to flow as well, which is more difficult, especially in small systems. These observations may signal that mechanisms other than QGP formation and pressure gradients are responsible for the azimuthal anisotropy in J/ψ production. To provide insight into this puzzle we aim to measure the J/ψ azimuthal distributions and look for flow in pp collisions using the CMS detector. |
Saturday, April 15, 2023 12:21PM - 12:33PM |
B10.00007: Heavy-Flavor Angular Correlations Measured by the ALICE Experiment Amanda N Flores Heavy-flavor (charm and beauty) quarks are generated primarily via hard scattering processes in high-energy hadronic collisions. Two-particle azimuthal correlations of heavy flavor particles are a differential measurement which allows for the study of the production and jet fragmentation of heavy quarks. By measuring the azimuthal correlation in different transverse momentum (pT) regions, one can study the details of the structure and momentum distribution of particles produced in heavy-flavor jet fragmentation. The azimuthal correlations between electrons from heavy-flavor decays (trigger) and charged hadrons (associated) are studied in varying trigger and associate particle pT regions. A distinguishing feature of heavy ion (such as Pb-Pb) collisions is the production of a possible phase of nuclear matter, called a Quark Gluon Plasma (QGP). By comparing the heavy-flavor and charged hadron azimuthal correlations in different collision systems, we can determine how the heavy-quark production and fragmentation is modified by interactions with the QGP medium. In this talk, the status of this measurement in pp, p-Pb, and Pb-Pb collisions conducted with the ALICE experiment will be presented. |
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