Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session C13: Relativistic Heavy Ions I (Hard probes)
7:00 PM–10:00 PM,
Tuesday, November 28, 2023
Hilton Waikoloa Village
Room: Kona 2-3
Chair: Anthony Timmins, University of Houston
Abstract: C13.00007 : Dielectron production in high-multiplicity pp collisions at $sqrt{s}$ = 13 TeV with ALICE
8:30 PM–8:45 PM
Presenter:
Hikari Murakami
Author:
Hikari Murakami
Collaboration:
ALICE
As of now, results of such measurements at the LHC and RHIC are compatible with expected hadron decays and no significant sign of medium modification has been reported. However in recent studies, collective behavior of hadrons has been seen in high-multiplicity pp and p-Pb collisions at the LHC and RHIC similarly to previous observations in heavy-ion collisions. If a medium is created in such small colliding systems, it should give rise to an additional contribution of electromagnetic radiation in the direct photon spectrum.
For each real direct photon production mechanism, an associated process producing a virtual photon which converts to a low-mass dielectron pair exists as well. These processes, referred to as internal conversions, allow for the measurement of virtual direct photons with better signal to background ratio compared to real direct photon measurement at low transverse momentum, which is where the thermal radiation signal sits.
In this talk, the measurement of virtual photon production in minimum-bias and high-multiplicity pp collisions at $sqrt{s}$ = 13 TeV will be presented. The analysis uses the full ALICE Run 2 dataset, and the results are compared with theoretical calculations.
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