학술논문
Measurement of flavor asymmetry of the light-quark sea in the proton with Drell-Yan dimuon production in p+p and p+d collisions at 120 GeV
Document Type
article
Author
Dove, J; Kerns, B; Leung, C; McClellan, RE; Miyasaka, S; Morton, DH; Nagai, K; Prasad, S; Sanftl, F; Scott, MBC; Tadepalli, AS; Aidala, CA; Arrington, J; Ayuso, C; Barker, CT; Brown, CN; Chang, TH; Chang, WC; Chen, A; Christian, DC; Dannowitz, BP; Daugherity, M; Diefenthaler, M; Fassi, L El; Geesaman, DF; Gilman, R; Goto, Y; Guo, L; Guo, R; Hague, TJ; Holt, RJ; Isenhower, D; Kinney, ER; Kitts, ND; Klein, A; Kleinjan, DW; Kudo, Y; Lin, P-J; Liu, K; Liu, MX; Lorenzon, W; Makins, NCR; de Medeiros, M Mesquita; McGaughey, PL; Miyachi, Y; Mooney, I; Nakahara, K; Nakano, K; Nara, S; Peng, JC; Puckett, AJ; Ramson, BJ; Reimer, PE; Rubin, JG; Sawada, S; Sawada, T; Shibata, T-A; Shiu, SH; Su, D; Teo, M; Tice, BG; Towell, RS; Uemura, S; Watson, TS; Wang, SG; Wickes, AB; Wu, J; Xi, Z; Ye, Z
Source
Physical Review C. 108(3)
Subject
Language
Abstract
Evidence for a flavor asymmetry between the ū and d¯ quark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on x (fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of the d¯(x)/ū(x) ratio in the x>0.15 region. We report results from the SeaQuest Fermilab E906 experiment with improved statistical precision for d¯(x)/ū(x) in the large x region up to x=0.45 using the 120 GeV proton beam. Two different methods for extracting the Drell-Yan cross section ratios, σpd/2σpp, from the SeaQuest data give consistent results. The d¯(x)/ū(x) ratios and the d¯(x)-ū(x) differences are deduced from these cross section ratios for 0.13