Lambda(1520) production in Cu+Cu collisions at $\sqrt{s_{NN}} = 200$ GeV in STAR

ORAL

Abstract

Due to their short life-time ($\sim$fm/c), hadronic resonances provide information on the hadronic medium between chemical and kinetic freeze-out via the processes of re-generation and re-scattering of the decay particles. Previous studies have showed a suppression of the $\Lambda^{*}/\Lambda$ and $K^{*}/K$ ratios in Au+Au collisions relative to p+p collisions at $\sqrt{s_{NN}} = 200$ GeV. The magnitude of this suppression indicates the system time span between the two freeze-outs. The onset of this suppression occurs in the region of 2-100 participating nucleons (peripheral collisions), and remains constant thereafter. The Cu+Cu system is therefore important because it provides us with a smaller system to study more precisely the onset of suppression. We present the first measurement of $\Lambda$(1520) mass spectra and yields via hadronic channel, $\Lambda^{*}\rightarrow p+K$, at midrapidity in Cu+Cu collisions at $\sqrt{s_{NN}} =200$GeV using the STAR experiment at RHIC.

Authors

  • Masayuki Wada

    The University of Texas at Austin