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arXiv 1006.2845hep-phhep-ex
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用第三代费米子解LHC的超中性规范玻色子

Unravelling an Extra Neutral Gauge Boson at the LHC using Third Generation Fermions

Ross Diener, Stephen Godfrey, Travis A. W. Martin

摘要:

我们研究了在大型强子对撞机pp碰撞中使用额外中性规范玻色子(Z ')性质的测量来揭示潜在物理的可能性。我们专注于第三代末态(tau,b,t)在区分模型与非通用的Z '-费米子耦合的有用性。我们提出了一个更新的Z的发现限制,包括2010-2011年大型强子对撞机运行,包括模型与非通用耦合。我们展示了sigma(pp -> Z' -> ttbar)、sigma(pp -> Z' -> bbbar)和sigma(pp -> Z' -> tau^+tau^-)与sigma(pp -> Z' -> mu^+mu^-)的比值如何用于区分模型和测量模型的参数。特别感兴趣的是具有优先耦合的模型,例如具有发电相关耦合的模型。我们还发现,前向后不对称性测量与第三代费米子在最终状态可以提供重要的输入,以了解Z '的性质。了解探测器的分辨率和效率对于提取结果至关重要。

英文摘要:

We study the potential to use measurements of extra neutral gauge bosons (Z') properties in pp collisions at the Large Hadron Collider to unravel the underlying physics. We focus on the usefulness of third generation final states (tau, b, t) in distinguishing between models with non-universal Z'-fermion couplings. We present an update of discovery limits of Z's including the 2010-2011 LHC run and include models with non-universal couplings. We show how ratios of sigma(pp -> Z' -> ttbar), sigma(pp -> Z' -> bbbar), and sigma(pp -> Z' -> tau^+tau^-) to sigma(pp -> Z' -> mu^+mu^-) can be used to distinguish between models and measure parameters of the models. Of specific interest are models with preferential couplings, such as models with generation dependent couplings. We also find that forward-backward asymmetry measurements with third generation fermions in the final state could provide important input to understanding the nature of the Z'. Understanding detector resolution and efficiencies will be crucial for extracting results.

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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