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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
Phys Rev Lett. 2020 Dec 4;125(23):231801. doi: 10.1103/PhysRevLett.125.231801.
A search for the decay K_{S}^{0}→μ^{+}μ^{-} is performed using proton-proton collision data, corresponding to an integrated luminosity of 5.6 fb^{-1} and collected with the LHCb experiment during 2016, 2017, and 2018 at a center-of-mass energy of 13 TeV. The observed signal yield is consistent with zero, yielding an upper limit of B(K_{S}^{0}→μ^{+}μ^{-})<2.2×10^{-10} at 90% C.L.. The limit reduces to B(K_{S}^{0}→μ^{+}μ^{-})<2.1×10^{-10} at 90% C.L. once combined with the result from data taken in 2011 and 2012.
利用质子-质子碰撞数据开展了对衰变(K_{S}^{0}→μ^{+}μ^{-})的搜寻，该数据对应5.6 (fb^{-1})的积分亮度，是大型强子对撞机底夸克实验（LHCb）在2016年、2017年和2018年质心能量为13 TeV时收集的。观测到的信号产额与零相符，在90%置信水平下得到(B(K_{S}^{0}→μ^{+}μ^{-})<2.2×10^{-10})的上限。一旦与2011年和2012年采集的数据结果相结合，该上限在90%置信水平下降至(B(K_{S}^{0}→μ^{+}μ^{-})<2.1×10^{-10})。
