$Λ$ Production at High Rapidity in d+Au Collisions at $\sqrt{s_{NN}} = 200$ GeV

Details $Λ$ Production at High Rapidity in d+Au Collisions at $\sqrt{s_{NN}} = 200$ GeV $Λ$ Production at High Rapidity in d+Au Collisions at $\sqrt{s_{NN}} = 200$ GeV

2004-03-12

arxiv.org/abs/nucl-ex/0403017v1

Physics

Nuclear Physics

Nuclear Experiment

These results have been presented as a poster at Quark Matter 2004 in Oakland, CA

Scientific paper

We present first preliminary studies of $\Lambda$ and $\bar{\Lambda}$ production in the pseudorapidity region $2.5 < |\eta| < 4$, covered by the forward radial-drift TPCs (FTPCs) in STAR. The FTPCs provide momentum and charge determination but no particle identification, making the use of combinatorial methods and background subtraction necessary for $\Lambda$ identification. The $\bar{\Lambda}/\Lambda$ ratio measured at high rapidity is compared to the ratio obtained at mid-rapidity with the STAR TPC. Differences in the ratio at positive and negative rapidity point to an asymmetry in particle and antiparticle production in d+Au collisions.

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