$\rho (770{)}^0$ and $f_0(980)$ Production in Au+Au and pp Collisions at $\sqrt{s_{NN}}$ = 200 GeV

Abstract

Preliminary results on $\rho (770{)}^0$ and $f_0(980)$ production at mid-rapidity using the mixed-event technique are presented. The ${\rho }^0$ and $f_0$ measurements via their hadronic decay channel in minimum bias pp and peripheral Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV were performed using the STAR detector at RHIC. This is the first direct measurement of ${\rho }^0(770)\to {\pi }^{+}{\pi }^{-}$ and $f_0(980)\to {\pi }^{+}{\pi }^{-}$ in heavy-ion collisions. The ${\rho }^0$ mass is transverse momentum dependent and significantly shifted in minimum bias pp and peripheral Au+Au interactions. The modifications of masses, widths and line shapes of short-lived resonances due to phase space and dynamical effects are discussed. The ${\rho }^0/{\pi }^{-}$ and the $f_0/{\pi }^{-}$ ratios are compared to measurements in pp and e${}^{+}$e${}^{-}$ interactions at various energies.

arXiv comment6 pages, 4 figures, proceedings of Strange Quarks in Matter (SQM2003), Atlantic Beach, USA, to be published in J. Phys. G

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