arxiv: 1209.4029 · v3 · ★pith:RGEYFAUUnew · submitted 2012-09-18 · ✦ hep-ex
Search for the rare decay KS -> mu+ mu-
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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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