Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session J15: Mini-Symposium on Hard Probes in Heavy Ion Collisions IFocus
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Sponsoring Units: DNP Chair: Julia Velkovska, Vanderbilt University Room: Sheraton Plaza Court 4 |
Sunday, April 14, 2019 1:30PM - 2:06PM |
J15.00001: Developments in hard probes of heavy ion collisions Invited Speaker: Dennis V Perepelitsa In this talk, I will provide a general overview of the status, interpretation, and future prospects for hard probe measurements of ultrarelativistic heavy ion collisions. In recent years, existing hard probes measurements have reached new levels of precision and systematic control, while entirely new channels and techniques have also been developed. These include single and di-hadrons, fully reconstructed jets, electroweak boson + jet pairs, jet structure and substructure, and heavy flavor production. I will discuss what these measurements reveal about the nature of the Quark Gluon Plasma at RHIC and the LHC, and give some thoughts on future prospects. |
Sunday, April 14, 2019 2:06PM - 2:18PM |
J15.00002: PHENIX Results Using $\pi^0$ Triggered Two Particle Correlations as a Probe of Jet Modification by The Quark Gluon Plasma Anthony M Hodges In order to probe the energy transport properties of the Quark Gluon Plasma (QGP)– a hot, dense state of matter with partonic degrees of freedom formed in relativistic heavy ion collisions – we study modifications to highly collimated, energetic sprays of particles known as jets. In the early stages of the collision, hard scatterings – collisions with high $Q^{2}$ -- produce high $p_T$ partons that traverse the QGP, losing energy as they do so and fragmenting into sprays of particles known as jets. The method by which these partons lose energy, soft gluon emission, results in broader jets and suppressed high momentum jet yield, a phenomenon referred to as Jet Quenching. In the presented analysis, we use two particle correlations, where high $p_{T}$ trigger $\pi^{0}$s are correlated in azimuth to associated charged hadrons, to measure modifications to the jet shape and yield. We will present results showing jet modification in the most central collisions (0-20%) of PHENIX’s 2010 and 2011 Au+Au datasets using Acoustic Scaling and Absolute Background Subtraction to subtract higher order (n = 3,4) flow harmonics. Comparisons between p+p and Au+Au jets will be presented examining both the yield – via the double ratio $R_{I}$ -- and the away-side jet width. |
Sunday, April 14, 2019 2:18PM - 2:30PM |
J15.00003: Study of Jet related Two-Particle Azimuthal correlations result in d+Au and $^{3}$He+Au with PHENIX Abinash Pun Angular correlations between pairs of final state particles (2 particle correlation) is useful technique to study the properties of the Quark Gluon Plasma (QGP) in the heavy ion collision. This technique is also considered to be useful to study the small systems like d+Au to isolate cold-nuclear matter effects. Comparison of the correlation in small systems to those in Au+Au can help to identify effects from the final-state interactions in the QGP, created in Au+Au. The quantity, $R_I$, the double ratio of near- to away-side per-trigger yields divided by the same in the p+p reference, can cancel out the systematics to the level where very small modification could be observable. We present the PHENIX preliminary results for $R_I$ in d+Au and $^{3}$He+Au which reveals interesting jet modification which offers the opportunity to clarify the roles of Cold Nuclear Matter from potential Hot Nuclear Matter effects in small systems. |
Sunday, April 14, 2019 2:30PM - 2:42PM |
J15.00004: Isolated photon-jet correlations in pp and p-Pb collisions with ALICE at the LHC Alwina Liu The photon-tagged correlation of jets is a promising channel for the study of partonic energy loss in heavy-ion collisions. The energy of the photon is not affected by the quark-gluon plasma (QGP) and thus gives information about the energy of the parton prior to interaction with the QGP. These measurements are made with the aim of benchmarking a similar study in Pb-Pb collisions, as comparisons between measurements in pp, pA, and AA collisions provide an opportunity to study cold and hot nuclear matter effects. The data for these measurements was collected in 2013 from √sNN = 5 TeV p-Pb collisions and in 2017 from √s = 5 TeV pp collisions, with respective integrated luminosities of 4.6 nb-1 and 300 nb-1. A combination of isolation and shower-shape variables is used to reduce the background in the photon sample from fragmentation photons and meson decays. The purity of the isolated photon selection is extracted using a template fit with a data-driven background estimate. The angular correlation and momentum balance of isolated photon-jet pairs is computed for photons with 15 < pT < 30 GeV/c measured with the ALICE Electromagnetic Calorimeter and jets with pT > 8 GeV/c reconstructed from tracks using only the ALICE Inner Tracking System. |
Sunday, April 14, 2019 2:42PM - 2:54PM |
J15.00005: Isolated Photon-Hadron Correlations in 5 TeV pp and p-Pb Collisions in ALICE at the LHC Fernando Torales - Acosta The measurement of isolated photon-tagged correlations of jets and jet fragments is a promising channel for the study of partonic energy loss in heavy-ion collisions. Isolated photons are an excellent probe because they contain the parton kinematics from the initial hard scattering. This analysis studies isolated photon-hadron correlations using data collected at A Large Ion Collider Experiment (ALICE) in 2013 during √sNN = 5 TeV p-Pb collisions and in 2017 during √s = 5 TeV pp collisions at the Large Hadron Collider (LHC). The per-trigger associated hadron yields for isolated photons with 12 < pT < 15 GeV/c and associated charged particles with and 0.5 < pT < 10 GeV/c are measured. The yields measured in pp collisions and p-Pb collisions are consistent within uncertainties. This analysis is one of the first to use isolated photons in a measurement at ALICE, and establishes a benchmark for future measurements in Pb–Pb collisions. |
Sunday, April 14, 2019 2:54PM - 3:06PM |
J15.00006: Automated discovery of jet substructure analyses Yue Shi Lai Jet substructure analysis has the promise to reveal the details of the QCD shower beyond existing jet cross section and coincidence measurements in hadron collider QCD and heavy-ion. Traditional jet |
Sunday, April 14, 2019 3:06PM - 3:18PM |
J15.00007: Feasibility studies for key jet measurements at the Electron-Ion Collider Miguel I Arratia, Miguel I Arratia Jet quenching is one of the key signatures of the quark-gluon plasma. The accepted explanation for this effect is parton energy loss due to medium-induced radiation. QCD-based calculations describe parton energy loss in cold nuclei and the hot quark-gluon plasma on an equal footing. The Electron-Ion Collider (EIC) offers us a unique opportunity to understand the fundamental physics of quark energy loss in a controlled environment—with known parton kinematics, flavour, and medium length and density. I present an exploratory study of jet measurements in deep-inelastic scattering events at the EIC. One of the key measurements are lepton-jet angular correlations in e-p and e-A collisions, which will allow us to constrain jet transverse-momentum broadening and transverse-momentum dependent PDFs; with polarized beams, this observable also is sensitive to the quark Sivers effect. I use the projected integrated luminosities and momentum resolutions of current detector designs to obtain the sensitivity for key parameters controlling energy loss in cold nuclei. |
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