Observation of the decay B --> Kl+l-.

2001/09/30 by K. Abe, R. Abe, I. Adachi +169 · 10 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.88.021801

published as Phys.Rev.Lett.88:021801,2002 · submitted to Physical Review Letter

arxiv created 2001/10/19 · openalex publication_date 2002/01/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31

Abstract

We report a search for the flavor-changing neutral current decay B-->K(*)l+l- using a 29.1 fb(-1) data sample accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- storage ring. We observe the decay process B-->Kl+l-(l = e, mu), for the first time, with a branching fraction of B(B-->Kl+l-) = (0.75(+0.25)(-0.21)+/-0.09)x10(-6).

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