论文标题
Gluon Sivers功能和横向单个自旋不对称中的$ e + p^\ uparrow \ rightarrowγ + x $
Gluon Sivers function and transverse single spin asymmetries in $e + p^\uparrow \rightarrow γ+ X$
论文作者
论文摘要
我们介绍了在迅速光子产生中的横向单旋不对称的估计值，在偏光质子靶标的低虚拟光子散射中，并讨论了将其用作探针以获取有关Gluon Sivers功能（GSF）的信息的可能性。 Using a generalized parton model (GPM) framework, we estimate the asymmetries at electron-ion collider energy ($\sqrt{s}$ =140 GeV) taking into account both direct and resolved photon processes and find that the dominant contribution, up to $10\%$, comes from quark Sivers function (QSF) while the contribution from GSF is found to be up to $2\%$.但是，考虑到通过颜色分析不变的Parton模型方法的过程依赖性初始和最终状态相互作用的影响，我们发现情况发生了很大变化，QSF的贡献接近零，最高为$ 1 \％$ $ $级别的水平贡献\ textIt {f textit {f} f} -type type gsf。我们的结果表明，此过程可能有助于区分gpm和颜色 - 规范的广义Parton模型，并且可以用作\ textit {f} -Type GSF的良好探针。
We present estimates of transverse single-spin asymmetry in prompt photon production in the scattering of low virtuality photons off a polarized proton target and discuss the possibility of using this as a probe to get information about the gluon Sivers function (GSF). Using a generalized parton model (GPM) framework, we estimate the asymmetries at electron-ion collider energy ($\sqrt{s}$ =140 GeV) taking into account both direct and resolved photon processes and find that the dominant contribution, up to $10\%$, comes from quark Sivers function (QSF) while the contribution from GSF is found to be up to $2\%$. However, upon taking into account the effects of the process-dependent initial and final state interactions through the color-gauge invariant generalized parton model approach we find that the situation is significantly changed, with near zero contributions from the QSFs and up to a $1\%$ level contribution from the \textit{f}-type GSF. Our results indicate that this process may be useful for distinguishing between GPM and color-gauge invariant generalized parton models and can be used as a good probe of \textit{f}-type GSF.
