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arXiv 1205.4465hep-phhep-ex
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阈值附近多喷注的规范玻色子产生

Gauge-boson production with multiple jets near threshold

Xiaohui Liu, Sonny Mantry, Frank Petriello

摘要:

超越标准模型的新物理学的特征通常是与多个喷流相关的大的缺失横向能量($\not E_T$)。这种过程的主要标准模型背景来自与喷流有关的规范玻色子的产生。标准的搜索策略包括在$m_{eff}$分布中寻找过量,其中$m_{eff}= \not E_T +\sum_{J} p^T_J$和$p^T_J$表示第$J$喷流的横向动量。大$m_{eff}$的区域主要由在阈值附近的射流产生,引起大的Sudakov扰动,其可以改变$m_{eff}$分布的大小和形状。我们提出了一个有效的理论框架,重新确认这种阈值的算法。我们进行了分析,独家喷气生产使用的N-jettiness全球事件的形状,这使得理论上的控制,也保持了否决额外的喷气机引起的大的crocomms。作为第一步,我们给出了显式的数值结果与下一个领先的日志(NLL)重申$pp \to γ+ 2$射流在大$m_{eff}$区域。

英文摘要:

Signatures of new physics beyond the Standard Model are often characterized by large missing transverse energy ($\not E_T$) produced in association with multiple jets. The dominant Standard Model background to such processes comes from gauge-boson production in association with jets. A standard search strategy involves looking for an excess in the $m_{eff}$ distribution, where $m_{eff}= \not E_T +\sum_{J} p^T_J$ and $p^T_J$ denotes the transverse momentum of the $J$-th jet. The region of large $m_{eff}$ is dominated by jet production near threshold, giving rise to large Sudakov logarithms that can change the magnitude and shape of the $m_{eff}$ distribution. We present an effective theory framework for the resummation of such threshold logarithms. We perform an analysis for exclusive jet production using the N-jettiness global event shape, which allows theoretical control to also be maintained over large logarithms induced by vetoing additional jets. As a first step, we give explicit numerical results with next-to-leading-log (NLL) resummation for $pp \to γ+ 2$ jets in the large $m_{eff}$ region.

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