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Identified Hadron Spectra and Baryon Stopping in γ+Au\gamma +\mathrm {Au} Collisions at STAR

Collaboration
•
for the collaboration.
2023
4 pages
Published in:
  • Acta Phys.Polon.Supp. 16 (2023) 1, 1-A152,
  • Acta Phys.Polon.Supp. 16 (2023) 1, 152
Contribution to:
  • Published: 2023
DOI:
Experiments:
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Abstract: (Acta Physica Polonica B Editorial Office)
Photonuclear collisions are one of the simplest processes possible in a heavy-ion collision. They occur when one nucleus emits a quasi-real photon which interacts with the another colliding nucleus, similar to an e+Ae+A collision except that the photon tends to have much smaller virtuality. Results are presented for identified π±\pi ^\pm , K±K^\pm , and p(pˉ)p(\bar {p}) spectra in photonuclear collisions at STAR for Au+Au collisions at sNN=54.4\sqrt {s_{_{NN}}} = 54.4 GeV. Significant baryon stopping and rapidity asymmetry are observed at low transverse momentum, which could indicate the existence of a baryon junction within the nucleon, a nonperturbative Y-shaped configuration of gluons which carries the baryon number and is attached to all three valence quarks. Measurements of identified particle spectra and their rapidity dependence in γ+A\gamma +A events will give insights into the origin of baryon stopping and also inform future measurements of identified particles at the Electron-Ion Collider.
  • nucleus nucleus: scattering
  • impact parameter: high
  • photon nucleus: scattering
  • STAR
  • baryon
  • pi: production
  • K: production
  • anti-p
  • p: production
  • rapidity: asymmetry