Searches for low-mass dimuon resonances
Searches for low-mass dimuon resonances
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DOI：
10.1007/jhep10(2020)156
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发表时间：
2020-10-26
影响因子：
5.4
通讯作者：
Zunica, G.
中科院分区：
文献类型：
--
作者：
Aaij, R.;Beteta, C. Abellan;Zunica, G.
利用LHCb探测器收集的积分光度为5.1 fb（-1）的数据样本，对质心能量为13 TeV的质子-质子碰撞产生的低质量双μ子共振X进行了计算。X玻色子既可以迅速衰变，也可以从质子-质子碰撞中被取代，在这两种情况下，对事件的要求和对产生机制的假设都尽可能地保持最小。对迅速衰变的X玻色子的搜索探索了从双μ子阈值附近到60 GeV的质量范围，其中不可忽略的X宽度被认为超过20 GeV。对位移X -> mu（+）mu（-）衰变的搜索考虑了高达3 GeV的质量。没有搜索发现信号的证据，并且90%置信水平的排除限制被放置在X -> mu（+）mu（-）横截面上，每个横截面具有最小的模型依赖性。此外，这些结果被用来放置世界领先的限制GeV尺度玻色子在两个希格斯偶极子和隐藏的山谷的情况下。
Searches are performed for a low-mass dimuon resonance, X, produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using a data sample corresponding to an integrated luminosity of 5.1 fb(-1) and collected with the LHCb detector. The X bosons can either decay promptly or displaced from the proton-proton collision, where in both cases the requirements placed on the event and the assumptions made about the production mechanisms are kept as minimal as possible. The searches for promptly decaying X bosons explore the mass range from near the dimuon threshold up to 60 GeV, with nonnegligible X widths considered above 20 GeV. The searches for displaced X -> mu (+)mu (-) decays consider masses up to 3 GeV. None of the searches finds evidence for a signal and 90% confidence-level exclusion limits are placed on the X -> mu (+)mu (-) cross sections, each with minimal model dependence. In addition, these results are used to place world-leading constraints on GeV-scale bosons in the two-Higgs-doublet and hidden-valley scenarios.