# Improved limit on the branching fraction of the rare decay $K^0_S \to \mu^+\mu^-$

LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Improved limit on the branching fraction of the rare decay $K^0_S \to \mu^+\mu^-$. European Physical Journal C - Particles and Fields, C77(10):678.

## Abstract

A search for the decay $K^0_S \to \mu^+\mu^-$ is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of $3 fb^{−1}$, collected by the LHCb experiment at centre-of-mass energies of 7 and 8TeV. The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of $\mathcal{B}(K^0_S \to \mu^+\mu^−) < 0.8 (1.0) × 10^{−9}$ at 90% (95%) confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude.

## Abstract

A search for the decay $K^0_S \to \mu^+\mu^-$ is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of $3 fb^{−1}$, collected by the LHCb experiment at centre-of-mass energies of 7 and 8TeV. The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of $\mathcal{B}(K^0_S \to \mu^+\mu^−) < 0.8 (1.0) × 10^{−9}$ at 90% (95%) confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics Physical Sciences > Engineering (miscellaneous) Physical Sciences > Physics and Astronomy (miscellaneous) English 2017 29 Jan 2018 15:54 13 May 2020 22:04 Springer 1434-6044 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1140/epjc/s10052-017-5230-x

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