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Abstract

We report results on the total and elastic cross sections in proton-proton collisions at sqrt{s}=200 GeV obtained with the Roman Pot setup of the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The elastic differential cross section was measured in the squared four-momentum transfer range 0.045 \leq -t \leq 0.135 GeV^2. The value of the exponential slope parameter $B$ of the elastic differential cross section d\sigma/dt \sim e^{-Bt} in the measured -t range was found to be B = 14.32 \pm 0.09 (stat.)^{\scriptstyle +0.13}_{\scriptstyle -0.28} (syst.) GeV^{-2}. The total cross section \sigma_{tot}, obtained from extrapolation of the d\sigma/dt to the optical point at -t = 0, is \sigma_{tot} = 54.67 \pm 0.21 (stat.) ^{\scriptstyle +1.28}_{\scriptstyle -1.38} (syst.) mb. We also present the values of the elastic cross section \sigma_{el} = 10.85 \pm 0.03 (stat.) ^{\scriptstyle +0.49}_{\scriptstyle -0.41}(syst.) mb, the elastic cross section integrated within the STAR t-range \sigma^{det}_{el} = 4.05 \pm 0.01 (stat.) ^{\scriptstyle+0.18}_{\scriptstyle -0.17}(syst.) mb, and the inelastic cross section \sigma_{inel} = 43.82 \pm 0.21 (stat.) ^{\scriptstyle +1.37}_{\scriptstyle -1.44} (syst.) mb. The results are compared with the world data.