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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Department of Physics, University of Warwick, Coventry, United Kingdom.
Phys Rev Lett. 2023 Jul 28;131(4):041804. doi: 10.1103/PhysRevLett.131.041804.
A search for the very rare D^{0}→μ^{+}μ^{-} decay is performed using data collected by the LHCb experiment in proton-proton collisions at sqrt[s]=7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb^{-1}. The search is optimized for D^{0} mesons from D^{*+}→D^{0}π^{+} decays but is also sensitive to D^{0} mesons from other sources. No evidence for an excess of events over the expected background is observed. An upper limit on the branching fraction of this decay is set at B(D^{0}→μ^{+}μ^{-})<3.1×10^{-9} at a 90% C.L. This represents the world's most stringent limit, constraining models of physics beyond the standard model.
利用大型强子对撞机底夸克实验（LHCb）在质心能量(\sqrt{s}=7)、(8)和(13) TeV的质子-质子碰撞中收集的数据，开展了对极为罕见的(D^{0}\to\mu^{+}\mu^{-})衰变的搜寻。此次搜寻针对(D^{* +}\to D^{0}\pi^{+})衰变产生的(D^{0})介子进行了优化，但对其他来源的(D^{0})介子也很敏感。未观察到事件数超过预期背景的迹象。在(90%)置信水平下，该衰变分支比的上限设定为(B(D^{0}\to\mu^{+}\mu^{-}) < 3.1\times10^{-9})。这代表了世界上最严格的限制，对超出标准模型的物理模型构成了约束。
