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
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
复制标题
利用 120 GeV 的 p p 和 p d 碰撞中的 Drell-Yan 低介子产生来测量质子中轻夸克海的味道不对称性
DOI：
10.1103/physrevc.108.035202
复制
发表时间：
2023
影响因子：
3.1
通讯作者：
Scott, M. B.
中科院分区：
文献类型：
--
作者：
Dove, J.;Kerns, B.;Leung, C.;McClellan, R. E.;Miyasaka, S.;Morton, D. H.;Nagai, K.;Prasad, S.;Sanftl, F.;Scott, M. B.
在深度非弹性散射和Drell-yan实验中，已经发现了质子中夸克分布和夸克分布之间存在味道不对称的证据。在费米实验室E866 Drell-yan实验中观察到的这种味道不对称性与(部分子携带的核子动量的分数)的显著相关性表明，这一区域的比例有所下降。我们报告了SeaQuest Fermilab E906实验的结果，该实验在120GeV质子束的更大范围内提高了统计精度。从SeaQuest数据中提取Drell-yan横截面比率的两种不同方法给出了一致的结果。理论和差异是从这些横截面的比率推导出来的。SeaQuest和E866/NuSearatios在该地区的协议很好。然而，新的SeaQuest数据显示，这一数字继续大于最高值()。并与各种部分子分布函数和理论计算结果进行了比较。
Evidence for a flavor asymmetry between theandquark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on(fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of theratio in theregion. We report results from the SeaQuest Fermilab E906 experiment with improved statistical precision forin the largeregion up tousing the 120 GeV proton beam. Two different methods for extracting the Drell-Yan cross section ratios,, from the SeaQuest data give consistent results. Theratios and thedifferences are deduced from these cross section ratios for. The SeaQuest and E866/NuSearatios are in good agreement for theregion. The new SeaQuest data, however, show thatcontinues to be greater thanup to the highestvalue (). The new results onandare compared with various parton distribution functions and theoretical calculations.