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arXiv 1612.01432hep-ph
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联合重传中的矢量玻色子产生

Vector boson production in joint resummation

Simone Marzani, Vincent Theeuwes

摘要:

本文研究了在联合再确认的背景下,通过Drell-Yan机制产生的电弱矢量玻色子的横动量($Q_T$)分布。这种形式主义允许在小$Q_T$和部分子阈值时增强的对数贡献的同时再确认。我们扩展联合重申到下一个到下一个领先的对数精度,我们提出了三种不同的现象学设置的mammed和匹配的结果。特别是,我们研究了在Tevatron和大型强子对撞机(LHC)的$Z$玻色子的生产,以及在LHC的生产较重的$Z^\prime$。我们比较我们的研究结果,标准的$Q_T$重申,以及固定阶微扰理论。我们发现,联合remation提供了一个温和的(但不是平坦的)校正相对于$Q_T$ remation,它导致减少的规模依赖的结果。然而,我们的研究也显示了这种形式主义的一些局限性。虽然在Tevatron和LHC的$Z^\prime$生产中使用联合再确认似乎是合理的,但我们的实现遭受了对远离阈值的过程的功率校正的更强依赖,例如LHC的$Z$生产,我们不能声称比标准的$Q_T$再确认有改进。

英文摘要:

We study the transverse momentum ($Q_T$) distribution of an electro-weak vector boson produced via the Drell-Yan mechanism, in the context of joint resummation. This formalism allows for the simultaneous resummation of logarithmic contributions that are enhanced at small $Q_T$ and at partonic threshold. We extend joint resummation to next-to-next-to leading logarithmic accuracy and we present resummed and matched results for three different phenomenological setups. In particular, we study the production of a $Z$ boson at the Tevatron and at the Large Hadron Collider (LHC), as well as the production of a heavier $Z^\prime$ at the LHC. We compare our findings to standard $Q_T$ resummation, as well as to fixed-order perturbation theory. We find that joint resummation provides a moderate (but not flat) correction with respect to $Q_T$ resummation and it leads to a reduction of the scale dependence of the results. However, our study also shows some limitations of this formalism. While the use of joint resummation for $Z$ production at the Tevatron and $Z^\prime$ production at the LHC appears to be justified, our implementation suffers from a stronger dependence on power corrections for processes which are further away from threshold, such as $Z$ production at the LHC, for which we cannot claim an improvement over standard $Q_T$ resummation.

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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