Results on total and elastic cross sections in proton–proton collisions at √ s ​ = 200 GeV

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Physical Letters B




We report results on the total and elastic cross sections in proton-proton collisions at 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≤−t≤0.135 GeV 2 . The value of the exponential slope parameter B of the elastic differential cross section dσ/dt∼e−Bt in the measured − t range was found to be B=14.32±0.09(stat.)−0.28+0.13(syst.) GeV −2 . The total cross section σtot , obtained from extrapolation of the dσ/dt to the optical point at −t=0 , is σtot=54.67±0.21(stat.)−1.38+1.28(syst.) mb. We also present the values of the elastic cross section σel=10.85±0.03(stat.)−0.41+0.49(syst.) mb, the elastic cross section integrated within the STAR t -range σeldet=4.05±0.01(stat.)−0.17+0.18(syst.) mb, and the inelastic cross section σinel=43.82±0.21(stat.)−1.44+1.37(syst.) mb. The results are compared with the world data.