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arXiv 1005.0374hep-phhep-th
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Shock Wave上的R电流DIS:超越Eikonal近似

R-Current DIS on a Shock Wave: Beyond the Eikonal Approximation

Yuri V. Kovchegov

摘要:

我们发现DIS结构函数在强耦合下,通过计算R-电流调制器上的有限大小的冲击波使用AdS/CFT对应。我们改进了现有的结果在文献中超越程函近似的两个最低阶引力子交换。我们认为,由于程函近似在强耦合下是1/x的整数次幂求和(x是Bjorken-x变量),在小x极限下,引入x的正整数次幂的非程函修正不能忽略,因为对程函级数中第(n+1)项的非程函阶x修正在x中的阶数与该级数中第n项的阶数相同.我们证明,在定性协议与早期DIS分析的基础上计算的期望值的威尔逊圈在冲击波背景下使用AdS/CFT,包括非程函修正后,DIS结构功能描述的两个动量尺度:Q_1^2 ~ Λ^2 \,A^{1/3}/x和Q_2^2 ~ Λ^2 \,A^{2/3},其中Λ是激波中的典型横向动量,如果激波代表原子核,则A是原子序数。我们讨论了Q_1和Q_2标度的可能物理意义。

英文摘要:

We find the DIS structure functions at strong coupling by calculating R-current correlators on a finite-size shock wave using AdS/CFT correspondence. We improve on the existing results in the literature by going beyond the eikonal approximation for the two lowest orders in graviton exchanges. We argue that since the eikonal approximation at strong coupling resums integer powers of 1/x (with x the Bjorken-x variable), the non-eikonal corrections bringing in positive integer powers of x can not be neglected in the small-x limit, as the non-eikonal order-x correction to the (n+1)st term in the eikonal series is of the same order in x as the nth eikonal term in that series. We demonstrate that, in qualitative agreement with the earlier DIS analysis based on calculation of the expectation value of the Wilson loop in the shock wave background using AdS/CFT, after inclusion of non-eikonal corrections DIS structure functions are described by two momentum scales: Q_1^2 ~ Λ^2 \, A^{1/3}/x and Q_2^2 ~ Λ^2 \, A^{2/3}, where Λis the typical transverse momentum in the shock wave and A is the atomic number if the shock wave represents a nucleus. We discuss possible physical meanings of the scales Q_1 and Q_2.

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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