Search for Dark Matter and Large Extra Dimensions in pp Collisions Yielding a Photon and Missing Transverse Energy
Search for Dark Matter and Large Extra Dimensions in pp Collisions Yielding a Photon and Missing Transverse Energy
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DOI：
10.1103/physrevlett.108.261803
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发表时间：
2012-04
影响因子：
1.3
通讯作者：
Cms Collaboration
中科院分区：
文献类型：
--
作者：
Cms Collaboration
给出了在包含光子和缺失横向能量的最终状态下寻找新物理的结果。这些数据对应于CMS实验在sqrt（s）= 7 TeV的pp碰撞中收集的5.0逆飞秒光垒的积分光度。所观察到的事件产量同意标准模型的期望的光子加失踪的横向能量事件。使用暗物质粒子（chi）产生的模型，我们设定了90%的置信水平（C.L.）在光子加缺失横向能态中，13.6- 15.4毫微微巴恩的Chi产生的上限。这些提供了最敏感的上限自旋相关的χ-核子散射的χ质量之间的1和100 GeV。对于自旋独立的贡献，目前的限制扩展到chi质量低于3.5 GeV。对于具有3- 6个大额外维度的模型，我们的数据排除了95%C. L时1.65和1.71 TeV之间的额外维度普朗克尺度。
Results are presented from a search for new physics in the final state containing a photon and missing transverse energy. The data correspond to an integrated luminosity of 5.0 inverse femtobarns collected in pp collisions at sqrt(s) = 7 TeV by the CMS experiment. The observed event yield agrees with standard-model expectations for the photon-plus-missing-transverse-energy events. Using models for production of dark-matter particles (chi), we set 90% confidence level (C.L.) upper limits of 13.6--15.4 femtobarns on chi production in the photon-plus-missing-transverse-energy state. These provide the most sensitive upper limits for spin-dependent chi-nucleon scattering for chi masses between 1 and 100 GeV. For spin-independent contributions, the present limits are extended to chi masses below 3.5 GeV. For models with 3--6 large extra dimensions, our data exclude extra-dimensional Planck scales between 1.65 and 1.71 TeV at 95% C.L.