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arXiv 0810.3522hep-ex
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在费米实验室对撞机探测器上用low-pT轻子阈在mu+mu+e/mu+met通道中寻找新物理

Search for new physics in the mu+mu+e/mu+met channel with a low-pT lepton threshold at the Collider Detector at Fermilab

The CDF Collaboration

摘要:

利用CDF II探测器收集的三轻子(trilepton)数据(对应于976 pb-1的积分亮度)来寻找新的物理。标准模型预言了一个低速率的三轻子事件,这使得一些超对称过程,如电荷中性伴子的产生,可以在这个通道中测量。mu+mu+l签名的调查,其中l是一个电子或μ子,与大的丢失的横向能量的额外要求。在这个分析中,轻子相对于光束方向的横动量(pT)低至5 GeV/c,这一选择提高了对轻粒子以及导致轻子衰变的τ轻子的灵敏度。同时,由于在低轻子动量下不可忽略的重夸克背景,这种低p_T选择带来了额外的挑战。这一背景是测量与创新技术,使用实验数据。几个双μ子和三轻子控制区进行了调查,实验结果和标准模型的预测之间的良好协议进行了观察。在信号区,我们观察到一个三μ子事件,并预期0.4+/-0.1 μ + μ +l事件

英文摘要:

A search for new physics using three-lepton (trilepton) data collected with the CDF II detector and corresponding to an integrated luminosity of 976 pb-1 is presented. The standard model predicts a low rate of trilepton events, which makes some supersymmetric processes, such as chargino-neutralino production, measurable in this channel. The mu+mu+l signature is investigated, where l is an electron or a muon, with the additional requirement of large missing transverse energy. In this analysis, the lepton transverse momenta with respect to the beam direction (pT) are as low as 5 GeV/c, a selection that improves the sensitivity to particles which are light as well as to ones which result in leptonically decaying tau leptons. At the same time, this low-p_T selection presents additional challenges due to the non-negligible heavy-quark background at low lepton momenta. This background is measured with an innovative technique using experimental data. Several dimuon and trilepton control regions are investigated, and good agreement between experimental results and standard-model predictions is observed. In the signal region, we observe one three-muon event and expect 0.4+/-0.1 mu+mu+l events

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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