论文标题
$ J/ψ$ -Photon生产的方位角不对称
Azimuthal asymmetries in $J/ψ$-photon production at the EIC
论文作者
论文摘要
我们使用TMD因化框架在未来的电子离子对撞机（EIC）的背靠背生产中计算了$ j/ψ$的方位角不对称和电子普罗替型散射过程的光子。我们考虑质子不偏振或横向极化的情况。对于$ j/ψ$的形成，使用非相关QCD（NRQCD）。我们发现，横截面仅从一个颜色八位词状态得到贡献，因此，方位角调制变得独立于长距离矩阵元素（LDMES），因此可以用于探测，尤其是在这种运动学中占主导地位的Gluon TMD。我们使用TMD上的阳性边界显示了不同方位角不对称的上限的估计值。此外，我们使用TMD的高斯参数化显示了不对称的估计值。
We calculate azimuthal asymmetries in back-to-back production of $J/ψ$ and a photon in electron-proton scattering process at the future electron-ion collider (EIC) using TMD factorization framework. We consider the cases where the proton is unpolarized or transversely polarized. For the formation of $J/ψ$, non-relativistic QCD (NRQCD) is used. We find that the cross-section gets contribution from only one color octet state, as a result, the azimuthal modulations become independent of the long-distance matrix elements (LDMEs), and thus can be used to probe, in particular the gluon TMDs which are dominant in this kinematics. We show estimates of the upper bounds of different azimuthal asymmetries using the positivity bounds on TMDs. In addition, we show estimate of asymmetries using the Gaussian parametrization of the TMDs.
