Imaging constituent quark shape of proton with exclusive vector meson production at HERA

IF 1.7 4区 物理与天体物理 Q2 PHYSICS, NUCLEAR
Wenchang Xiang , Yanbing Cai , Daicui Zhou
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引用次数: 0

Abstract

We show within proton hot spot picture that the exclusive vector meson production in electron-proton deeply inelastic scattering is sensitive to the individual width of the constituent quarks of the proton. For comparison, we calculate the exclusive J/Ψ production cross-sections in three cases, BuBd, Bu<Bd and BuBuBd, where the Bu, Bu and Bd denote the widths of two up quarks and a down quark. We find that only results calculated with BuBd can give a reasonable description of the exclusive J/Ψ production cross-section data at HERA. To test that our results are independent of the details of the model, we retain the average width of the three constituent quarks unchanged and compute the exclusive J/Ψ production cross-sections with contribution weight by setting different proportional coefficients (Wu and Wd) for the up and down quarks, respectively. It shows that the results calculated with WuWd can well reproduce the exclusive J/Ψ production data at HERA, while the opposite case cannot describe the HERA data. These interesting findings seem to indicate that the up quark has more gluons around it than the down quark at high energy although the spatial distribution of gluons fluctuates event-by-event. To ensure the relevant results independent of the species of the vector meson, we also calculate the ρ production cross-sections with the same group of parameters used in the exclusive J/Ψ production and compare the predictions with the HERA data. It shows that all the results computed in the exclusive ρ productions are consistent with the findings obtained in the exclusive J/Ψ productions.

质子的组成夸克形状与HERA的唯一矢量介子产生成像
我们在质子热点图中表明,电子-质子深度非弹性散射中的独占矢量介子产生对质子组成夸克的单个宽度敏感。为了比较,我们计算了Bu≥Bd、Bu<Bd和Bu≠Bu′≠Bd三种情况下的J/Ψ产生横截面,其中Bu、Bu′和Bd分别表示两个上夸克和一个下夸克的宽度。我们发现,只有用Bu≥Bd计算的结果才能合理地描述HERA独家J/Ψ生产截面数据。为了验证我们的结果与模型细节无关,我们保持三个组成夸克的平均宽度不变,并通过分别为上夸克和下夸克设置不同的比例系数(Wu和Wd)来计算具有贡献权重的专属J/Ψ生产截面。结果表明,以Wu≥Wd计算的结果可以很好地再现HERA的独家J/Ψ产量数据,反之则不能描述HERA数据。这些有趣的发现似乎表明,在高能量下,上夸克周围的胶子比下夸克多,尽管胶子的空间分布随事件而波动。为了确保相关结果与矢量介子的种类无关,我们还计算了与独家J/Ψ生产中使用的参数组相同的ρ生产截面,并将预测结果与HERA数据进行了比较。结果表明,ρ值的计算结果与J/Ψ值的计算结果一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nuclear Physics A
Nuclear Physics A 物理-物理:核物理
CiteScore
3.60
自引率
7.10%
发文量
113
审稿时长
61 days
期刊介绍: Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.
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