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 F14: Relativistic Heavy Ions II
9:00 AM–11:45 AM,
Thursday, November 30, 2023
Hilton Waikoloa Village
Room: Kohala 4
Chair: Ron Soltz, Lawrence Livermore Natl Lab
Abstract: F14.00007 : Event-by-event fluctuations on light-nuclei production in coalescence model*
10:30 AM–10:45 AM
Presenter:
Koichi Murase
(Yukawa Institute for Theoretical Physics, Kyoto University)
Authors:
Koichi Murase
(Yukawa Institute for Theoretical Physics, Kyoto University)
Shanjin Wu
(Lanzhou University)
The yield ratio of light nuclei, Nt Np / Nd2 (with Nt, Np, and Nd being triton, proton, and deuteron numbers, respectively), is one of the observables suggested for a possible signal of the critical point of quantum chromodynamics (QCD). Based on the analyses with idealized setups, the yield ratio is known to be sensitive to the two-point neutron correlation and thus to the critical correlations. However, it is non-trivial how the yield ratio is affected by the other contributions in realistic setups of heavy-ion collisions, such as anisotropic flows and the initial-state fluctuations.
In this talk, we establish a qualitative understanding of how event-by-event fluctuations affect the yield ratio. We model the "single-event" distribution f(x, p) by a superposition of n-Gaussian hot spots in phase space and randomize the positions and magnitudes of the hot spots from event to event. We obtain analytical formulae for the yields of light nuclei and related ratios under this setup. We investigate how each feature of the event-by-event distribution affects the yield ratio. We also discuss the scale separation between the critical correlations and short-range thermal fluctuations using two different sizes of hot spots.
*This work was supported by JSPS (No. JP23K13102) and NSFC (Nos. 12075007 and 11947236).
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