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arXiv 1003.4997hep-phhep-ex
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来自重味衰变的孤立轻子:理论和数据

Isolated leptons from heavy flavor decays: Theory and data

Zack Sullivan, Edmond L. Berger

摘要:

孤立轻子事件在高能对撞机物理设施中新物理现象的特征中起着重要作用。在早期的文献中,我们研究了标准模型对底介子和粲介子及重子通过半轻子衰变(b,c -> l + X)产生孤立轻子的贡献,表明在某些运动学域中,这个源可以压倒其他标准模型过程的影响。在本文中,我们表明,我们获得了很好的协议与最近的Tevatron对撞机的数据,既验证了我们的模拟,并表明我们低估了孤立轻子产量的重味贡献的大小。我们还表明,隔离的要求作为一个窄带滤波器的孤立轻子的动量,我们说明了这种过滤器的效果的背景希格斯玻色子观察双轻子模式。我们引入并证明了一个新的经验法则:从重味衰变中产生的孤立电子和μ子与b和c夸克的分布大致相同,但分别是b和c夸克产生率的1/200。

英文摘要:

Events with isolated leptons play a prominent role in signatures of new physics phenomena at high energy collider physics facilities. In earlier publications, we examine the standard model contribution to isolated lepton production from bottom and charm mesons and baryons through their semileptonic decays (b, c -> l + X), showing that this source can overwhelm the effects of other standard model processes in some kinematic domains. In this paper, we show that we obtain good agreement with recent Tevatron collider data, both validating our simulations and showing that we underestimate the magnitude of the heavy-flavor contribution to the isolated lepton yields. We also show that the isolation requirement acts as a narrow bandpass filter on the momentum of the isolated lepton, and we illustrate the effect of this filter on the background to Higgs boson observation in the dilepton mode. We introduce and justify a new rule of thumb: isolated electrons and muons from heavy flavor decay are produced with roughly the same distributions as b and c quarks, but with 1/200 times the rates of b and c production, respectively.

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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