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arXiv 1106.4161hep-phhep-ex
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关于LHC双射流事件的共振搜索

On resonance search in dijet events at the LHC

M. V. Chizhov, V. A. Bednyakov, J. A. Budagov

摘要:

讨论了LHC双喷流事件共振搜索的新策略。用于凹凸搜索的主要分布是具有适当切割的双射不变质量分布。关键的切割,这是适用于最大限度地提高信号的意义,是(伪)两个喷流之间的速度差。这是由于量子色动力学背景对这个变量的贡献呈指数增长。通常假定来自几乎所有奇异模型的信号都位于中心双喷流快度区y_{1,2} ~ 0,|y_1-y_2| ~ 0。相比之下,激发玻色子对这一区域没有贡献,但在chi = exp中几乎平坦的QCD背景上产生了过量的双喷事件。|一年二月|远离这个地区。因此,不同的切割组应适用于新的物理搜索取决于搜索的共振属性。为了确认凸点和揭示共振性质,还应使用各种角分布。特别是,对于激发玻色子的参数的特殊选择可能会导致下降的中心比分布在dijet不变质量,而不是一个颠簸,预计在最奇异的模型。

英文摘要:

New strategy for resonance search in dijet events at the LHC is discussed. The main distribution used for a bump search is the dijet invariant mass distribution with appropriated cuts. The crucial cut, which is applied to maximize signal significance, is on (pseudo)rapidity difference between the two jets. This is due to the exponential growing of the QCD background contribution with this variable. Usually it is assumed that signal from almost all exotic models populates the central dijet rapidity region y_{1,2} ~ 0 and |y_1-y_2| ~ 0. By contrast, the excited bosons do not contribute into this region, but produce an excess of dijet events over the almost flat QCD background in chi = exp|y_1-y_2| away from this region. Therefore, different sets of cuts should be applied for new physics search depending on the searched resonance properties. In order to confirm the bump and reveal the resonance nature various angular distributions should be used in addition. In particular, for the excited bosons the special choice of parameters could lead to a dip in the centrality ratio distribution over the dijet invariant mass instead of a bump, expected in the most exotic models.

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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