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arXiv 1808.04396hep-phhep-ex
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半包容深度非弹性散射中大横向动量的挑战

Challenges with Large Transverse Momentum in Semi-Inclusive Deeply Inelastic Scattering

J. O. Gonzalez-Hernandez, T. C. Rogers, N. Sato, B. Wang

摘要:

本文综述了在中等硬尺度下和在非常大的横动量极限下半包容深度非弹性散射的唯象状态。当横动量变得与整体硬尺度相当或大于整体硬尺度时,微分截面应该可以用固定阶pQCD方法计算,而小横动量(TMD因子分解)近似最终应该失效。我们发现HERMES和COMPASS的数据和固定顺序的计算与现代部分子密度之间存在很大的分歧,即使在运动学的区域,这种计算应该是非常准确的。提出了可能的解释。

英文摘要:

We survey the current phenomenological status of semi-inclusive deep inelastic scattering at moderate hard scales and in the limit of very large transverse momentum. As the transverse momentum becomes comparable to or larger than the overall hard scale, the differential cross sections should be calculable with fixed order pQCD methods, while small transverse momentum (TMD factorization) approximations should eventually break down. We find large disagreement between HERMES and COMPASS data and fixed order calculations done with modern parton densities, even in regions of kinematics where such calculations should be expected to be very accurate. Possible interpretations are suggested.

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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