Search for the rare decay B to pi l+ l-

Details Search for the rare decay B to pi l+ l- Search for the rare decay B to pi l+ l-

2006-07-24

arxiv.org/abs/hep-ex/0607048v1

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 7 postscript figues, submitted to ICHEP2006

Scientific paper

We present results of a search for the rare flavor-changing neutral-current decay B --> pi l+ l-, based on a data sample corresponding to 209 fb-1 of integrated luminosity collected with the BABAR detector at the PEP-II B Factory. We reconstruct the four exclusive B decay modes B+ --> pi+ l+ l- and B0 --> pi0 l+ l-, where l is either an e or mu. We find no evidence for a signal, and we obtain the upper limit at 90% confidence level on the lepton-flavor--averaged branching fraction to be BF(B+ --> pi+ l+ l-) = 2 x tau_B+/tau_B0 x BF(B0 --> pi0 l+ l-) < 7.9 x 10-8. We also obtain an upper limit at 90% confidence level on the lepton-flavor--violating decay B --> pi e mu of BF(B --> pi e mu) < 9.8 x 10-8.

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