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 M14: Relativistic Heavy Ions III
2:00 PM–4:15 PM,
Friday, December 1, 2023
Hilton Waikoloa Village
Room: Kohala 4
Chair: Takafumi Niida
Abstract: M14.00002 : Tracking the baryon quantum number with heavy-ion collisions
2:15 PM–2:30 PM
Presenter:
Chun Yuen Tsang
(Kent State University)
Author:
Chun Yuen Tsang
(Kent State University)
Collaboration:
STAR collaboration
We report our first finding based on data from isobar collisions (9644Ru+9644Ru and 9640Zr+9640Zr) at √sNN = 200 GeV. The result shows that at mid-rapidity (|y| < 0.5), the ratio of net baryon (B) to the net charge difference (ΔQ) between the two systems is roughly twice the ratio of mass number to atomic number differences (i.e. 96/4) in central collisions. If both charge and baryon numbers are carried by the valence quarks, B/ΔQ should be close to 96/4. Moreover, results from semi-inclusive photonuclear Au+Au collisions at √sNN = 54.4 GeV show baryon stopping (an excess of baryons compared to anti-baryons) with a significant rapidity asymmetry. The rapidity dependence of the measured baryon stopping is comparable to that observed in hadronic nucleus-nucleus collisions and to the baryon junction prediction.
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