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

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

2003-05-29

arxiv.org/abs/nucl-ex/0305034v2

J.Phys.G30:S565-S570,2004

Physics

Nuclear Physics

Nuclear Experiment

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

Scientific paper

10.1088/0954-3899/30/1/069

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.

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