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Adams, J.R.; Aggarwal, I.; Bairathi, V.; Barish, K.; Bellwied, R.; Bhasin, A.; Bhosale, S.R.; Ceska, J.; Chaloupka, P.; Chen, J.; Das, A.; Dunlop, J.C.; Esumi, S.; Fatemi, R.; Fazio, S.; Gao, T.; Geurts, F.; Grosnick, D.; Guryn, W.; Harasty, M.D.; He, X.H.; Herrmann, N.; Hu, C.; Huang, H.Z.; Jalotra, A.; Jia, J.; Kabana, S.; Kang, K.; Khanal, A.; Kiselev, A.; Landgraf, J.M.; Li, D.; Li, W.; Licenik, R.; Liu, C.; Liu, G.; Liu, H.; Liu, T.; Luo, J.; Ma, R.; Ma, Y.G.; Manikandhan, R.; Mezhanska, O.; Nain, A.S.; Nasim, M.; Nie, M.; Odyniec, G.; Oh, S.; Pal, S.; Pawlowska, D.; Pokhrel, B.R.; Posik, M.; Pruthi, N.K.; Przybycien, M.; Ritter, H.G.; Roy Chowdhury, P.; Sato, S.; Schaefer, B.C.; Shah, N.; Shanmuganathan, P.V.; Sheikh, A.I.; Shen, D.; Shou, Q.Y.; Smirnov, N.; Stewart, D.J.; Suaide, A.A.P.; Sun, C.; Sun, Y.; Tang, A.H.; Tlusty, D.; Trentalange, S.; Truhlar, T.; Tsai, O.D.; Tsang, C.Y.; Tyler, J.; Upsal, I.; Videbæk, F.; Voloshin, S.A.; Wang, J.; Wang, Y.; Wang, Y.; Wielanek, D.; Wieman, H.; Wilks, G.; Wissink, S.W.; Witt, R.; Wu, J.; Xi, B.; Xiao, Z.G.; Xie, G.; Xie, W.; Xu, Y.; Yang, Q.; Ye, Z.; Ye, Z.; Yu, Y.; Zhang, X.; Zhang, Z.J.; Zhao, M.; Zyzak, M.
Physics letters. B, 20/May , Letnik: 852, Številka: CJournal Article
We report results on an elastic cross section measurement in proton–proton collisions at a center-of-mass energy s=510 GeV, obtained with the Roman Pot setup of the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The elastic differential cross section is measured in the four-momentum transfer squared range 0.23≤−t≤0.67 GeV2. This is the only measurement of the proton-proton elastic cross section in this t range for collision energies above the Intersecting Storage Rings (ISR) and below the Large Hadron Collider (LHC) colliders. We find that a constant slope B does not fit the data in the aforementioned t range, and we obtain a much better fit using a second-order polynomial for B(t). This is the first measurement below the LHC energies for which the non-constant behavior B(t) is observed. The t dependence of B is also determined using six subintervals of t in the STAR measured t range, and is in good agreement with the phenomenological models. The measured elastic differential cross section dσ/dt agrees well with the results obtained at s=540 GeV for proton–antiproton collisions by the UA4 experiment. We also determine that the integrated elastic cross section within the STAR t-range is σelfid=462.1±0.9(stat.)±1.1(syst.)±11.6(scale)μb.
