Search for the rare decay KS0→μ +μ-

Aaij, R; Abellan Beteta, C; Adametz, A; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; A. 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doi:10.1007/JHEP01(2013)090

A search for the decay KS0 μ+μ - is performed, based on a data sample of 1.0 fb-1 of pp collisions at 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 B (KS 0 → μ+μ-) < 11(9) × 10 -9 at 95 (90)% confidence level. This limit is a factor of thirty below the previous measurement. © 2013 Cern for the benefit of the LHCb collaboration

Aaij, R., Abellan Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2013). Search for the rare decay KS0→μ +μ-. JOURNAL OF HIGH ENERGY PHYSICS, 2013(1) [10.1007/JHEP01(2013)090].