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arXiv 1004.0535hep-ph
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在LHC上观测标准模型希格斯玻色子衰变到弱玻色子与伴随光子融合产生的b \bar{b}末态的前景

Prospects for Observing the Standard Model Higgs Boson Decaying into b\bar{b} Final States Produced in Weak Boson Fusion with an Associated Photon at the LHC

D. M. Asner, M. Cunningham, S. Dejong, K. Randrianarivony, C. Santamarina, M. Schram

摘要:

大型强子对撞机的主要目标之一是了解电弱对称性破缺机制。在标准模型中,电弱对称性破缺由希格斯机制描述,希格斯机制包括标量希格斯玻色子。电弱测量将标准模型希格斯玻色子的质量限制在114.4到157 GeV/c^2的范围内。在这个质量窗口内,希格斯粒子主要衰变为两个b夸克。因此,我们调查的前景观察标准模型希格斯衰变到b \bar{b}产生的弱玻色子融合与相关的中心光子。一个孤立的,高pt,中央光子触发器预计将在ATLAS和CMS实验。在这项研究中,我们调查的影响源自淋浴,强子化,底层的事件模型,喷流性能,包括b-jet校准的敏感性,这个通道。我们发现,蒙特卡罗和蒙特卡罗调谐的选择有很大的影响,中央喷射否决权的效力,从而信号的意义。当m(希格斯粒子)=115 GeV/c^2,积分光度积分亮度为100 1/fb时,信号显著性约为1.86,这相当于在14 TeV pp碰撞时设计光度为一年。

英文摘要:

One of the primary goals of the Large Hadron Collider is to understand the electroweak symmetry breaking mechanism. In the Standard Model, electroweak symmetry breaking is described by the Higgs mechanism which includes a scalar Higgs boson. Electroweak measurements constrain the Standard Model Higgs boson mass to be in the 114.4 to 157 GeV/c^2 range. Within this mass window, the Higgs predominantly decays into two b-quarks. As such, we investigate the prospect of observing the Standard Model Higgs decaying to b\bar{b} produced in weak-boson-fusion with an associated central photon. An isolated, high pt, central photon trigger is expected to be available at the ATLAS and CMS experiments. In this study, we investigated the effects originating from showering, hadronization, the underlying event model, and jet performance including b-jet calibration on the sensitivity of this channel. We found that the choice of Monte Carlo and Monte Carlo tune has a large effect on the efficacy of the central jet veto and consequently the signal significance. A signal significance of about 1.86 can be achieved for m(Higgs)=115 GeV/c^2 with 100 1/fb of integrated luminosity which correspond to one year at design luminosity at 14 TeV pp collisions.

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