Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session EH: Mini-symposium: Hadron Production and Interactions in Jets and Media II |
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Chair: Deepa Thomas, UT Austin Room: Whittier |
Tuesday, October 12, 2021 11:45AM - 12:21PM |
EH.00001: Heavy Flavor and Strangeness in Jets and Jets-Medium Interactions Invited Speaker: Olga Evdokimov Advances in detector technologies and data analysis techniques have firmly established jet measurements as experimental tools for exploring matter produced in heavy-ion interactions. On par, our theoretical understanding of the interactions of hard-scattered partons with a hot Quark-Gluon Plasma (QGP) medium formed in such collisions expanded dramatically. |
Tuesday, October 12, 2021 12:21PM - 12:33PM |
EH.00002: Asymmetric Energy Loss of Jets Due to Collective Flow in Heavy-Ion Collisions Matthew D Sievert, Hasan R Rahman, Joseph Bahder, Logan M Antiporda At high energies, jets lose energy primarily through the radiation of multiple soft gluons; for jets created in nuclear environments such as the quark-gluon plasma produced in heavy-ion collisions, the resulting pattern of this radiation carries information about the spatial and momentum distribution of particles in the medium. Using a recently-derived theoretical framework for jet-velocity coupling, we study the influence of a relativistic expanding plasma on the pattern of medium-induced radiation from jets. We find that the pattern of medium-induced radiation is sensitive to the magnitude and direction of the velocity, leading to the asymmetric radiation of soft gluons preferentially in the direction of the velocity. We also explore the implications of this mechanism for the deposition of energy and momentum in the plasma and measured collective flow. |
Tuesday, October 12, 2021 12:33PM - 12:45PM |
EH.00003: Data-driven extraction of the substructure of quark and gluon jets in proton-proton and heavy-ion collisions YEN-JIE Lee, Yi Chen, Yueyang Ying, Jasmine Brewer The modification of quark- and gluon-initiated jets in the quark-gluon plasma produced in heavy-ion collisions is a long-standing question that has not yet received a definitive answer from experiments. In particular, the size of the modifications differs between theoretical models. Therefore a fully data-driven technique is crucial for an unbiased extraction of the quark and gluon jet spectra and substructure. In this talk we demonstrate a fully data-driven method for separating quark and gluon contributions to jet observables using a statistical technique called topic modeling. In addition to variables such as constituent multiplicity, we employ machine learning based algorithm to enhance the separation power of the quark and gluon like jets. We will also demonstrate that jet substructures, such as jet shapes and jet fragmentation function, could be extracted using this data-driven method. This proof-of-concept study is based on proton-proton and heavy-ion collision events from the PYQUEN generator with statistics accessible in Run 4 of the Large Hadron Collider. These results suggest the potential for an experimental determination of quark- and gluon-jet spectra and their substructures. |
Tuesday, October 12, 2021 12:45PM - 12:57PM |
EH.00004: The first anti-kT jet measurements in hadronic e+e- collisions at 91 GeV with ALEPH archived data at LEP YEN-JIE Lee, Yi Chen, Kylee Karden, Chris McGinn, Marcello Maggi, Pao-Ti Chang
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Tuesday, October 12, 2021 12:57PM - 1:09PM |
EH.00005: Abstract Withdrawn
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Tuesday, October 12, 2021 1:09PM - 1:21PM |
EH.00006: Are we seeing color (de)coherence in heavy-ion collisions? Laura B Havener Jets are excellent probes of the quark-gluon plasma (QGP) produced in heavy-ion (HI) collisions because the partons inside jets interact with the medium, leading to jet energy loss and substructure modification - a phenomenon called jet quenching. Jet substructure measurements investigate how the internal structure of the jet is modified by the medium, providing insight about jet-medium interactions. In particular, observables that focus on the hard parton splittings inside the jet may tell us about color decoherence, where the medium can resolve and modify the splitting as two independent color charges. Recent jet splitting measurements in HI collisions hint that we are seeing color decoherence through the modification of these observables. This interpretation is complicated, however, because such results can also be explained by a possible change in quark/gluon fractions in HI collisions due to the expectation that gluons are more significantly modified in the medium. This talk will discuss the question of decoherence in light of recent measurements, theoretical predictions, and new Monte Carlo studies. Ideas of how to disentangle these effects will be proposed, including using electroweak boson and heavy-flavor tagged jets, especially in the context of the upcoming LHC Run 3. |
Tuesday, October 12, 2021 1:21PM - 1:33PM |
EH.00007: Hard scattering production measurements in p+Au collisions at √sNN = 200 GeV in STAR Tong Liu With the observation of flow-like correlations in small system collisions at both RHIC and the LHC, the existence of the quark-gluon plasma (QGP) in such collisions has become a question under active pursuit over recent years. |
Tuesday, October 12, 2021 1:33PM - 1:45PM |
EH.00008: Abstract Withdrawn |
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