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Improved limit on the branching fraction of the rare decay KS0→μ+μ-
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- LHCb Collaboration
- et al.
Published Web Location
http://doi.org/10.1140/epjc/s10052-017-5230-xNo data is associated with this publication.
Abstract
A search for the decay K S 0 → μ + μ - 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 8 TeV . The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of B ( K S 0 → μ + μ - ) < 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.