Results on total and elastic cross sections in proton–proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo linebreak="goodbreak" linebreakstyle="after">=</mml:mo><mml:mn>200</mml:mn></mml:math> GeV
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, D. M. Anderson, A. Aparin, E. C. Aschenauer, M. U. Ashraf, F. G. Atetalla, A. Attri, G. S. Averichev, V. Bairathi, K. N. Barish, A. Behera, R. Bellwied, A. Bhasin, J. Bielčík, J. Bielčíková, L. C. Bland, I. G. Bordyuzhin, J. D. Brandenburg, A. V. Brandin, S. Bueltmann, J. M. Butterworth, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, I. Chakaberia, P. Chaloupka, B. K. Chan, F-H. Chang, Z. Chang, N. Chankova-Bunzarova, A. Chatterjee, D. Chen, J.H. Chen, X. Chen, Z. Chen, J. Cheng, M. Cherney, M. Chevalier, S. Choudhury, W. Christie, X. Chu, H. J. Crawford, M. Csanád, M. Daugherity, T. G. Dedovich, I. M. Deppner, A. A. Derevschikov, L. Didenko, X. Dong, J. L. Drachenberg, J. C. Dunlop, T. Edmonds, N. Elsey, J. Engelage, G. Eppley, S. Esumi, O. Evdokimov, A. Ewigleben, O. Eyser, R. Fatemi, S. Fazio, P. Federic, J. Fedorišin, C. Feng, Y. Feng, P. Filip, E. Finch, Y. Fisyak, A. Francisco, Ł. Fulek, C. A. Gagliardi, T. Galatyuk, F. J. M. Geurts, S. M. Gibson, K. Gopal, D. Grosnick, W. Guryn, A. I. Hamad, A. Hamed, S. Harabasz, J. W. Harris, S. He, W. He, X. H. He, S. Heppelmann, S. Heppelmann, N. Herrmann, E. Hoffman, L. Holub, Y. Hong, S. Horvat, Y. Hu, H. Z. Huang
Abstract
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 d σ / d t ∼ e − B t in the measured − t range was found to be B = 14.32 ± 0.09 ( s t a t . ) − 0.28 + 0.13 ( s y s t . ) GeV −2 . The total cross section σ t o t , obtained from extrapolation of the d σ / d t to the optical point at − t = 0 , is σ t o t = 54.67 ± 0.21 ( s t a t . ) − 1.38 + 1.28 ( s y s t . ) mb. We also present the values of the elastic cross section σ e l = 10.85 ± 0.03 ( s t a t . ) − 0.41 + 0.49 ( s y s t . ) mb, the elastic cross section integrated within the STAR t -range σ e l d e t = 4.05 ± 0.01 ( s t a t . ) − 0.17 + 0.18 ( s y s t . ) mb, and the inelastic cross section σ i n e l = 43.82 ± 0.21 ( s t a t . ) − 1.44 + 1.37 ( s y s t . ) mb. The results are compared with the world data.