Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session KF: Jets in Heavy-ion Collisions II
10:30 AM–12:18 PM,
Saturday, October 29, 2022
Hyatt Regency Hotel
Room: Celestin F
Chair: Raghav Kunnawalkam Elayavalli
Abstract: KF.00005 : Suppression of high pT Pi0 relative to prompt photon in central d+Au collision at 200GeV.
11:18 AM–11:30 AM
Presenter:
Niveditha Ramasubramanian
(Stony Brook University (SUNY))
Authors:
Niveditha Ramasubramanian
(Stony Brook University (SUNY))
Niveditha Ramasubramanian
(CEA, Saclay)
Direct photons are transparent to the QGP and thus RAA of direct photons at high pT should be unity for all classes of event activity. We observe that, in d+Au system, for central collisions the RAA of direct photons is close to unity but for peripheral collisions there is a significant enhancement which matches the degree of enhancement that is observed in RAA of Pi0s. This indicates a bias in centrality determination using Glauber model for small system collisions.
Furthermore, the direct photon measurement for d+Au can be used to experimentally determine the effective number of binary collisions Nexp for each event sample. By using this Nexp, the RAA of pi0 is re-obtained and this is close to unity for peripheral collisions but still show a significant suppression in central collisions which could be an indication of a formation of QGP droplets in central d+Au collisions.
In this talk, I will highlight preliminary approved results from d+Au collisions and the status of analysis in p+Au and 3He+Au system.
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