Results on Total and Elastic Cross Sections in Proton-Proton Collisions at $\sqrt{s}$ = 200 GeV Obtained with the STAR Detector at RHIC

Abstract: We report the first results on differential, total and elastic cross sections in proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC) at $\sqrt{s}=200$ GeV. The data lwere obtained with the Roman Pot Detector subsystem of the STAR experiment. The data used for this analysis cover the four-momentum transfer squared ~($t$) range $0.045 \le |t| \le 0.135$ (GeV/c)$<sup>2$. The Roman Pot system was placed downstream of the STAR detector. During the data taking the Roman Pots were moved to ~8$\sigma_{y}$, the vertical distance of from the beam center. They were operated during standard data taking procedure. The results include values of the exponential slope parameter (B), elastic cross section ($\sigma_{el}$) and the total cross section ($\sigma_{tot}$) obtained by extrapolation of the elastic differential cross section ($d\sigma/dt$) to the optical point at $|t| = 0$ (GeV/c)$<sup>{2}$. The detector setup and analysis procedure are reviewed. All results are compared with the world data.