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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
Phys Rev Lett. 2020 Jan 31;124(4):041801. doi: 10.1103/PhysRevLett.124.041801.
Searches are performed for both promptlike and long-lived dark photons, A^{'}, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for A^{'}→μ^{+}μ^{-} decays using a data sample corresponding to an integrated luminosity of 5.5 fb^{-1} collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the γ-A^{'} kinetic mixing strength. The promptlike A^{'} search explores the mass region from near the dimuon threshold up to 70 GeV and places the most stringent constraints to date on dark photons with 214<m(A^{'})≲740 MeV and 10.6<m(A^{'})≲30 GeV. The search for long-lived A^{'}→μ^{+}μ^{-} decays places world-leading constraints on low-mass dark photons with lifetimes O(1) ps.
针对在质心能量为13 TeV的质子 - 质子碰撞中产生的类即时和长寿命暗光子(A^{'})进行了搜索。这些搜索使用与LHCb探测器收集的5.5 fb⁻¹积分亮度相对应的数据样本，寻找(A^{'}→μ^{+}μ^{-})衰变。两项搜索均未发现信号迹象，并对(γ - A^{'})动力学混合强度设置了90%置信水平的排除极限。类即时(A^{'})搜索探索了从近双μ子阈值到70 GeV的质量区域，并对质量为214<(m(A^{'}))≲740 MeV和10.6<(m(A^{'}))≲30 GeV的暗光子设置了迄今为止最严格的限制。对长寿命(A^{'}→μ^{+}μ^{-})衰变的搜索对寿命为(O(1)) ps的低质量暗光子设置了世界领先的限制。
