Search for the rare decay KS -> mu+ mu-
LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva,, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio,, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S., Amato, Y. Amhis, L. Anderlini, J. Anderson
TL;DR
This paper reports a search for the rare decay KS -> mu+ mu- using LHCb data, setting a new upper limit on its branching ratio that is significantly lower than previous measurements.
Contribution
The study provides the most stringent upper limit to date on the branching ratio of KS -> mu+ mu-, improving previous bounds by a factor of thirty.
Findings
No evidence of the decay was observed.
The upper limit on BR(KS -> mu+ mu-) is set at 11 x 10^-9 (95% CL).
This result significantly constrains new physics models.
Abstract
A search for the decay KS -> mu+ mu- is performed, based on a data sample of 1.0 fb^-1 of pp collisions at \sqrt{s}=7 TeV collected by the LHCb experiment at the Large Hadron Collider. The observed number of candidates is consistent with the background-only hypothesis, yielding an upper limit of BR(KS -> mu+ mu-) < 11 (9) x 10^-9 at 95 (90)% confidence level. This limit is a factor of thirty below the previous measurement.
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