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arXiv 1206.6115hep-ph
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高p_T下精确的直接光子和W玻色子谱及其与LHC数据的比较

Precision direct photon and W-boson spectra at high p_T and comparison to LHC data

Thomas Becher, Christian Lorentzen, Matthew D. Schwartz

摘要:

在次-次-首固定阶下计算了矢量玻色子产生的微分p_T谱,并在次-次-首对数精度下重新计算了阈值谱。在高横动量p_T下,与ATLAS的直接光子产生和W产生数据进行了比较,发现两者吻合得很好。通过使用软共线有效理论对与不同尺度相关的贡献进行因子分解来实现重新计算。每个部分,然后计算微扰和个人的贡献合并使用重整化群方法。有效的理论框架的一个关键优势是,它表明了一套自然的尺度选择,与固定顺序的计算。恢复这些尺度的比值的矩阵导致更好的协议与数据和减少理论的不确定性。

英文摘要:

The differential p_T spectrum for vector boson production is computed at next-to-leading fixed order and including the resummation of threshold logarithms at next-to-next-to-leading logarithmic accuracy. A comparison is made to ATLAS data on direct photon and W production at high transverse momentum p_T, finding excellent agreement. The resummation is achieved by factorizing contributions associated with different scales using Soft-Collinear Effective Theory. Each part is then calculated perturbatively and the individual contributions are combined using renormalization group methods. A key advantage of the effective theory framework is that it indicates a set of natural scale choices, in contrast to the fixed-order calculation. Resummation of logarithms of ratios of these scales leads to better agreement with data and reduced theoretical uncertainties.

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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