Measurement of flavor asymmetry of the light-quark sea in the proton with Drell-Yan dimuon production in p plus p and p plus d collisions at 120 GeV

J. Dove, B. Kerns,C. Leung, R. E. Mcclellan, S. Miyasaka,D. H. Morton, K. Nagai,S. Prasad, F. Sanftl, M. B. C. Scott,A. S. Tadepalli,C. A. Aidala,J. Arrington, C. Ayuso, C. T. Barker, C. N. Brown, T. H. Chang,W. C. Chang,A. Chen, D. C. Christian, B. P. Dannowitz, M. Daugherity,M. Diefenthaler,L. El Fassi,D. F. Geesaman, R. Gilman, Y. Goto,L. Guo, R. Guo,T. J. Hague, R. J. Holt, D. Isenhower, E. R. Kinney, N. D. Kitts,A. Klein, D. W. Kleinjan,Y. Kudo,P. -J. Lin,K. Liu,M. X. Liu,W. Lorenzon, N. C. R. Makins,M. Mesquita de Medeiros, P. L. Mcgaughey,Y. Miyachi,I. Mooney, K. Nakahara, K. Nakano, S. Nara,J. C. Peng,A. J. Puckett, B. J. Ramson,P. E. Reimer,J. G. Rubin,S. Sawada,T. Sawada,T. -A. Shibata, S. H. Shiu,D. Su,M. Teo, B. G. Tice,R. S. Towell,S. Uemura, T. S. Watson,S. G. Wang, A. B. Wickes, J. Wu,Z. Xi, Z. Ye

arxiv（2023）

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摘要

Evidence for a flavor asymmetry between the u 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 (x)/u(x) ratio in the x>0.15 region. We report results from the SeaQuest Fermilab E906 experiment with improved statistical precision for d(x)/u(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, sigma(pd)/2 sigma(pp), from the SeaQuest data give consistent results. The d(x)/u(x) ratios and the d(x)-u(x) differences are deduced from these cross section ratios for 0.13更多

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