Deuteron polarizations in the proton-deuteron Drell-Yan process for finding the gluon transversity
Deuteron polarizations in the proton-deuteron Drell-Yan process for finding the gluon transversity
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DOI：
10.1103/physrevd.101.094013
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发表时间：
2020-03
影响因子：
5
通讯作者：
S. Kumano;S. Kumano;Qin-Tao Song
中科院分区：
文献类型：
--
作者：
S. Kumano;S. Kumano;Qin-Tao Song
氘核中的胶子横向分布由线性极化氘核状态之间的矩阵元素定义，除了轻子-氘核散射之外，还可以在质子-氘核碰撞中进行研究。光子的线偏振经常被使用，而对于自旋1氘核则很少使用。因此，需要用常规氘核自旋极化来表示氘核反应截面，以进行实际实验测量。在这项工作中，我们研究了质子-氘核 Drell-Yan 截面如何用传统偏振来表示，以找到胶子横切度分布。特别是，我们表明，通过沿两个横轴获取氘核自旋极化之间的横截面差异，可以在质子-氘核 Drell-Yan 过程中测量胶子横切度。由于自旋$1/2$核子不存在胶子横向，因此氘核的有限胶子横向可能表明氘核中核子的简单束缚系统之外的“奇异”机制。因此，胶子横断度是一个有趣且合适的观测值，可以揭示原子核中新的强子机制。
The gluon transversity distribution in the deuteron is defined by the matrix element between linearly polarized deuteron states, and it could be investigated in proton-deuteron collisions in addition to lepton-deuteron scattering. The linear polarization of photon is often used, whereas it is rarely used for the spin-1 deuteron. Therefore, it is desirable to express deuteron-reaction cross sections in term of conventional deuteron spin polarizations for actual experimental measurements. In this work, we investigate how proton-deuteron Drell-Yan cross sections are expressed by the conventional polarizations for finding the gluon transversity distribution. In particular, we show that the gluon transversity can be measured in the proton-deuteron Drell-Yan process by taking the cross section difference between the deuteron spin polarizations along the two-transverse axes. Since the gluon transversity does not exist for the spin-$1/2$ nucleons, a finite gluon transversity of the deuteron could indicate an ``exotic'' mechanism beyond the simple bound system of the nucleons in the deuteron. Therefore, the gluon transversity is an interesting and appropriate observable to shed light on a new hadronic mechanism in nuclei.