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arXiv 1107.5518hep-ex
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CDF和D0联合作用下标准模型希格斯玻色子产生的上限

Combined CDF and D0 Upper Limits on Standard Model Higgs Boson Production with up to 8.6 fb-1 of Data

The CDF, D0 Collaborations, the Tevatron New Phenomena, Higgs Working Group

摘要:

我们结合CDF和D 0的结果,在费米实验室Tevatron在sqrt{s}=1.96 TeV的ppbar碰撞中直接搜索标准模型(SM)希格斯玻色子(H)。与以前的Tevatron希格斯玻色子搜索组合相比,增加了更多的数据,纳入了额外的通道,并重新分析了一些以前使用的通道以获得灵敏度。我们使用的MSTW 08部分子分布函数和最新的理论截面时,比较我们的限制SM预测。CDF分析的数据高达8.2 fb-1,D 0分析的数据高达8.6 fb-1,95% C.L.对于质量m_H=115 GeV/c^2、140 GeV/c^2和165 GeV/c^2的希格斯玻色子,我们对希格斯玻色子产生的上限分别是SM截面值的1.17、1.71和0.48倍。在没有希格斯玻色子产生的情况下,相应的上限中值为1.16、1.16和0.57。有一个小的(接近。1 sigma)的数据事件相对于背景估计的过量,以搜索质量范围为125<m_H<155 GeV/c^2的希格斯玻色子。我们排除了,在95%的C. L.,在156<m_H<177 GeV/c^2之间的高质量区域中,有一个新的更大的区域,预期的排斥区域为148<m_H<180 GeV/c^2。

英文摘要:

We combine results from CDF and D0 on direct searches for the standard model (SM) Higgs boson (H) in ppbar collisions at the Fermilab Tevatron at sqrt{s}=1.96 TeV. Compared to the previous Tevatron Higgs boson search combination more data have been added, additional channels have been incorporated, and some previously used channels have been reanalyzed to gain sensitivity. We use the MSTW08 parton distribution functions and the latest theoretical cross sections when comparing our limits to the SM predictions. With up to 8.2 fb-1 of data analyzed at CDF and up to 8.6 fb-1 at D0, the 95% C.L. our upper limits on Higgs boson production are factors of 1.17, 1.71, and 0.48 times the values of the SM cross section for Higgs bosons of mass m_H=115 GeV/c^2, 140 GeV/c^2, and 165 GeV/c^2, respectively. The corresponding median upper limits expected in the absence of Higgs boson production are 1.16, 1.16, and 0.57. There is a small (approx. 1 sigma) excess of data events with respect to the background estimation in searches for the Higgs boson in the mass range 125<m_H<155 GeV/c^2. We exclude, at the 95% C.L., a new and larger region at high mass between 156<m_H<177 GeV/c^2, with an expected exclusion region of 148<m_H<180 GeV/c^2.

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