Collision-energy dependence of deuteron cumulants and proton-deuteron correlations in Au+Au collisions at RHIC

Research output: Contribution to journalArticlepeer-review

Abstract

We report the first measurements of cumulants, up to 4th order, of deuteron number distributions and proton-deuteron correlations in Au+Au collisions recorded by the STAR experiment in phase-I of Beam Energy Scan (BES) program at the Relativistic Heavy Ion Collider. Deuteron cumulants, their ratios, and proton-deuteron mixed cumulants are presented for different collision centralities covering a range of center-of-mass energy per nucleon pair sNN=7.7 to 200 GeV. It is found that the cumulant ratios at lower collision energies favor a canonical ensemble over a grand canonical ensemble in thermal models. An anti-correlation between proton and deuteron multiplicity is observed across all collision energies and centralities, consistent with the expectation from global baryon number conservation. The UrQMD model coupled with a phase-space coalescence mechanism qualitatively reproduces the collision-energy dependence of cumulant ratios and proton-deuteron correlations.

Original languageEnglish
Article number138560
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume855
DOIs
StatePublished - Aug 2024

Bibliographical note

Publisher Copyright:
© 2024

Keywords

  • Coalescence
  • Critical point
  • Deuteron production
  • Heavy-ion collisions
  • Higher moments
  • Thermal model

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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