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arXiv 1507.00359hep-ex
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寻找希格斯玻色子玻色子到不可检测粒子和一个或多个光子的奇异衰变

Search for exotic decays of a Higgs boson into undetectable particles and one or more photons

CMS Collaboration

摘要:

在质心能量为8 TeV的pp碰撞中,寻找希格斯玻色子衰变为不可探测粒子和一个或两个孤立光子的奇异衰变.这些数据对应的积分亮度高达19.4的反飞秒在大型强子对撞机的CMS探测器收集。研究了胶子-胶子融合中产生的与Z玻色子结合的希格斯玻色子,模型中希格斯玻色子衰变为引力伴子和中性伴子或中性伴子对,然后中性伴子衰变为引力伴子和光子.所选事件与仅背景假设一致,并且对截面和分支分数的乘积进行了限制。假设一个标准模型的希格斯玻色子的产生截面,一个95%的置信水平上限被设置在一个125 GeV的希格斯玻色子衰变成不可检测的粒子和一个或两个孤立的光子作为中性伴子质量的函数的分支分数。对于这类模型和中性伴子质量从1至120 GeV的上限范围为7至13%。进一步的结果作为一个功能的中性伴子的寿命,也为范围内的希格斯玻色子质量。

英文摘要:

A search is presented for exotic decays of a Higgs boson into undetectable particles and one or two isolated photons in pp collisions at a center-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of up to 19.4 inverse femtobarns collected with the CMS detector at the LHC. Higgs bosons produced in gluon-gluon fusion and in association with a Z boson are investigated, using models in which the Higgs boson decays into a gravitino and a neutralino or a pair of neutralinos, followed by the decay of the neutralino to a gravitino and a photon. The selected events are consistent with the background-only hypothesis, and limits are placed on the product of cross sections and branching fractions. Assuming a standard model Higgs boson production cross section, a 95% confidence level upper limit is set on the branching fraction of a 125 GeV Higgs boson decaying into undetectable particles and one or two isolated photons as a function of the neutralino mass. For this class of models and neutralino masses from 1 to 120 GeV an upper limit in the range of 7 to 13% is obtained. Further results are given as a function of the neutralino lifetime, and also for a range of Higgs boson masses.

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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