类时康普顿散射光生双轻子的排他性衍射
Exclusive diffractive photoproduction of dileptons by timelike Compton scattering
摘要：
我们推导了衍射$γp \to l^+ l^- p$反应在动量空间中的前向光生振幅。在$k_\perp$ -因式分解的形式体系中。预测的$γp \to l^+ l^- p$反应给出使用未整合的胶子分布从文献中。我们计算了总截面作为光子-质子质心能量和轻子对不变质量分布的函数。我们还讨论了类时虚光子的产生是否可以通过继续到类空域$ q^2 < 0$来近似。目前的计算提供了一个输入，为未来的预测独家hadroproduction在$p p \to p l^+ l^- p$反应。
英文摘要：
We derive the forward photoproduction amplitude for the diffractive $γp \to l^+ l^- p$ reaction in the momentum space. within the formalism of $k_\perp$- factorization. Predictions for the $γp \to l^+ l^- p$ reaction are given using unintegrated gluon distribution from the literature. We calculate the total cross section as a function of photon-proton center of mass energy and the invariant mass distribution of the lepton pair. We also discuss whether the production of timelike virtual photons can be approximated by continuing to the spacelike domain $ q^2 < 0$. The present calculation provides an input for future predictions for exclusive hadroproduction in the $p p \to p l^+ l^- p$ reaction.
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