Search for the Production of a Long-Lived Neutral Particle Decaying within the ATLAS Hadronic Calorimeter in Association with a Z Boson from pp Collisions at sqrt[s]=13 TeV.
Search for the Production of a Long-Lived Neutral Particle Decaying within the ATLAS Hadronic Calorimeter in Association with a Z Boson from pp Collisions at sqrt[s]=13 TeV.
复制标题
寻找 ATLAS 强子量热仪内与来自 sqrt[s]=13 TeV pp 碰撞的 Z 玻色子相关的长寿命中性粒子衰变的产生。
DOI：
10.1103/physrevlett.122.151801
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发表时间：
2019
影响因子：
8.6
通讯作者：
Aaboud M
中科院分区：
文献类型：
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作者：
Aaboud M
这封信提出了一个长寿命的中性粒子（）在ATLAS强子量能器内衰变的生产搜索，与标准模型（SM）玻色子通过一个中间标量玻色子，其中（，）产生。所使用的数据是由ATLAS探测器在2015年和2016年大型强子对撞机的质心能量为的碰撞期间收集的，对应于积分光度为。未观察到显著超出预期背景的事件。标量玻色子的产生截面乘以其衰变分支到长寿命中性粒子的分数的限制导出作为中间标量玻色子的质量，长寿命中性粒子的质量，和它的函数从几厘米到一百米。在中间标量玻色子是SM希格斯玻色子的情况下，它的衰变分支的一个长寿命的中性粒子与aapproximately在0.1和7 m之间的分数被排除与95%的置信水平高达10%之间为5和15 GeV。
This Letter presents a search for the production of a long-lived neutral particle () decaying within the ATLAS hadronic calorimeter, in association with a standard model (SM)boson produced via an intermediate scalar boson, where(,). The data used were collected by the ATLAS detector during 2015 and 2016collisions with a center-of-mass energy ofat the Large Hadron Collider and correspond to an integrated luminosity of. No significant excess of events is observed above the expected background. Limits on the production cross section of the scalar boson times its decay branching fraction into the long-lived neutral particle are derived as a function of the mass of the intermediate scalar boson, the mass of the long-lived neutral particle, and itsfrom a few centimeters to one hundred meters. In the case that the intermediate scalar boson is the SM Higgs boson, its decay branching fraction to a long-lived neutral particle with aapproximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% forbetween 5 and 15 GeV.