Mid-rapidity $Λ$ and $\barΛ$ Production in Au+Au Collisions at $\sqrt{s_{_{NN}}}=130$ GeV

Details Mid-rapidity $Λ$ and $\barΛ$ Production in Au+Au Collisions at $\sqrt{s_{_{NN}}}=130$ GeV Mid-rapidity $Λ$ and $\barΛ$ Production in Au+Au Collisions at $\sqrt{s_{_{NN}}}=130$ GeV

2002-03-22

arxiv.org/abs/nucl-ex/0203016v1

Phys.Rev.Lett.89:092301,2002

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.89.092301

We report the first measurement of strange ($\Lambda$) and anti-strange ($\bar{\Lambda}$) baryon production from $\sqrt{s_{_{NN}}}=130$ GeV Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). Rapidity density and transverse mass distributions at mid-rapidity are presented as a function of centrality. The yield of $\Lambda$ and $\bar{\Lambda}$ hyperons is found to be approximately proportional to the number of negative hadrons. The production of $\bar{\Lambda}$ hyperons relative to negative hadrons increases very rapidly with transverse momentum. The magnitude of the increase cannot be described by existing hadronic string fragmentation models.

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