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arXiv 1503.02672hep-ph
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前向-后向不对称性作为Z'玻色子的发现工具在LHC上

Forward-Backward Asymmetry as a Discovery Tool for Z' Bosons at the LHC

E. Accomando, A. Belyaev, J. Fiaschi, K. Mimasu, S. Moretti, C. Shepherd-Themistocleous

摘要:

Z'物理学中的前后不对称性(AFB)通常只被认为是可观察的,它可能允许人们通过区分这种(重)自旋1玻色子的不同模型来解释Z'信号。在本文中,我们研究的潜力,AFB在设置边界上,甚至发现一个Z'玻色子在大型强子对撞机(LHC),并表明它可能是一个强大的工具,用于这一目的。我们分析了两种不同的情况:Z'玻色子与窄和宽的宽度,分别。我们发现,在第一种情况下,AFB搜索的意义可以与实验合作通常采用的碰撞搜索相媲美;然而,作为(差分)截面的AFB具有减少系统误差的优点。在第二种情况下,AFB搜索可以在事件形状方面胜过碰撞搜索,因为作为重建的Z '玻色子的不变质量的函数的AFB分布的结构可以比通常在这种情况下采用的事件计数策略更好地确定新的宽共振。

英文摘要:

The Forward-Backward Asymmetry (AFB) in Z' physics is commonly only perceived as the observable which possibly allows one to interpret a Z' signal by distinguishing different models of such (heavy) spin-1 bosons. In this paper, we examine the potential of AFB in setting bounds on or even discovering a Z' boson at the Large Hadron Collider (LHC) and show that it might be a powerful tool for this purpose. We analyse two different scenarios: Z' bosons with a narrow and wide width, respectively. We find that, in the first case, the significance of the AFB search can be comparable with that of the bump search usually adopted by the experimental collaborations; however, being a ratio of (differential) cross sections the AFB has the advantage of reducing systematical errors. In the second case, the AFB search can win over the bump search in terms of event shape, as the structure of the AFB distribution as a function of the invariant mass of the reconstructed Z'boson could nail down the new broad resonance much better than the event counting strategy usually adopted in such cases.

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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