Search for long-lived particles decaying into muon pairs in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV collected with a dedicated high-rate data stream
Search for long-lived particles decaying into muon pairs in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV collected with a dedicated high-rate data stream
复制标题
使用专用高速数据流收集 $$ sqrt{s} $$ = 13 TeV 的质子-质子碰撞中，搜索衰变成 μ 介子对的长寿命粒子
DOI：
10.1007/jhep04(2022)062
复制
发表时间：
2022
影响因子：
5.4
通讯作者：
Krammer, N.
中科院分区：
文献类型：
--
作者：
Tumasyan, A.;Adam, W.;Andrejkovic, J. W.;Bergauer, T.;Chatterjee, S.;Dragicevic, M.;Escalante Del Valle, A.;Frühwirth, R.;Jeitler, M.;Krammer, N.
寻找衰变为μ子对的长寿命粒子是使用质子-质子碰撞进行的，质心能量为13 TeV，由CMS实验在2017年和2018年在LHC收集，对应于101 fb的积分光度。在这个搜索中使用的数据集收集与专用dimuon触发流与低横向动量阈值，记录在高速率通过保留减少的信息量，以探索否则无法访问的相空间在低dimuon质量和非零位移从主要的相互作用顶点。没有发现超出标准模型预期的显著事件，在95%置信水平上的分支分数的上限设置在广泛的质量和寿命假设超出标准模型框架与希格斯玻色子衰变成一对长寿命的暗光子，或与长寿命的标量共振所产生的衰变的B强子。的限制是最严格的参数空间的实质性区域的日期。这些结果也可以用来约束模型的位移dimuons没有明确考虑在本文中。
A search for long-lived particles decaying into muon pairs is performed using proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2017 and 2018, corresponding to an integrated luminosity of 101 fb. The data sets used in this search were collected with a dedicated dimuon trigger stream with low transverse momentum thresholds, recorded at high rate by retaining a reduced amount of information, in order to explore otherwise inaccessible phase space at low dimuon mass and nonzero displacement from the primary interaction vertex. No significant excess of events beyond the standard model expectation is found. Upper limits on branching fractions at 95% confidence level are set on a wide range of mass and lifetime hypotheses in beyond the standard model frameworks with the Higgs boson decaying into a pair of long-lived dark photons, or with a long-lived scalar resonance arising from a decay of a b hadron. The limits are the most stringent to date for substantial regions of the parameter space. These results can be also used to constrain models of displaced dimuons that are not explicitly considered in this paper.