arXiv 1802.095502018-02-26hep-phnucl-exnucl-th

小x射线下电子-核散射中的包容性瞬发光子产生

Inclusive prompt photon production in electron-nucleus scattering at small x

Kaushik Roy, Raju Venugopalan

备注：: 33 pages, 19 figures
发表信息：: JHEP05(2018)013
DOI：: 10.1007/JHEP05(2018)013

摘要：

在色玻璃凝聚体（CGC）有效理论框架下，计算了小$x$下电子与原子核深度非弹性散射（DIS）的微分截面.该框架中的首阶（LO）计算将$x$中的首阶数以及对$Q_{s,A}^2/Q^2$中的所有阶数的功率校正求和，其中$Q_{s,A}(x)$是核饱和标度。这个LO结果与原子核中的普适偶极和四极威尔逊线放大器成正比。在软光子极限下，Low-Burnett-Kroll定理使我们能够恢复现有的结果包含DIS dijet生产。$k_{\perp}$和共线分解表达式的提示光子产生DIS也恢复在一个领先的扭曲近似我们的结果。在后一种情况下，我们的结果对应于小$x$下的主导次主导阶（NLO）微扰QCD贡献。接下来我们讨论在CGC框架中计算包含的瞬发光子产生的非线性光学修正。特别是，我们强调高阶计算的优势，在包容性的光子生产，并充分包容DIS，所产生的简单的动量空间结构的穿着夸克和胶子的“冲击波”传播在“错误的”光锥规范$A^-=0$与$P^{+}_{N} \rightarrow \infty$移动的核。

英文摘要：

We compute the differential cross-section for inclusive prompt photon production in deeply inelastic scattering (DIS) of electrons on nuclei at small $x$ in the framework of the Color Glass Condensate (CGC) effective theory. The leading order (LO) computation in this framework resums leading logarithms in $x$ as well as power corrections to all orders in $Q_{s,A}^2/Q^2$, where $Q_{s,A}(x)$ is the nuclear saturation scale. This LO result is proportional to universal dipole and quadrupole Wilson line correlators in the nucleus. In the soft photon limit, the Low-Burnett-Kroll theorem allows us to recover existing results on inclusive DIS dijet production. The $k_{\perp}$ and collinearly factorized expressions for prompt photon production in DIS are also recovered in a leading twist approximation to our result. In the latter case, our result corresponds to the dominant next-to-leading order (NLO) perturbative QCD contribution at small $x$. We next discuss the computation of the NLO corrections to inclusive prompt photon production in the CGC framework. In particular, we emphasize the advantages for higher order computations in inclusive photon production, and for fully inclusive DIS, arising from the simple momentum space structure of the dressed quark and gluon "shock wave" propagators in the "wrong" light cone gauge $A^-=0$ for a nucleus moving with $P^{+}_{N} \rightarrow \infty$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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