We have performed a search for the flavor-changing neutral-current decays B-->pi l(+)l(-), where l(+)l(-) is either e(+)e(-) or mu(+)mu(-), using a sample of 230x10(6) Upsilon(4S)-->B(B)over-bar decays collected with the BABAR detector. We observe no evidence of a signal and measure the upper limit on the isospin-averaged branching fraction to be B(B-->pi l(+)l(-)) < 9.1 x 10(-8) at 90% confidence level. We also search for the lepton-flavor-violating decays B-->pi e(+/-)mu(-/+) and measure an upper limit on the isospin-averaged branching fraction of B(B-->pi e(+/-)mu(-/+)) < 9.2 x 10(-8) at 90% confidence level.

Search for the rare decay B ->pi l(+)l(-)

ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2007-01-01

Abstract

We have performed a search for the flavor-changing neutral-current decays B-->pi l(+)l(-), where l(+)l(-) is either e(+)e(-) or mu(+)mu(-), using a sample of 230x10(6) Upsilon(4S)-->B(B)over-bar decays collected with the BABAR detector. We observe no evidence of a signal and measure the upper limit on the isospin-averaged branching fraction to be B(B-->pi l(+)l(-)) < 9.1 x 10(-8) at 90% confidence level. We also search for the lepton-flavor-violating decays B-->pi e(+/-)mu(-/+) and measure an upper limit on the isospin-averaged branching fraction of B(B-->pi e(+/-)mu(-/+)) < 9.2 x 10(-8) at 90% confidence level.
2007
Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, Jp; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A; Tico, Jg; Grauges, E; Lopez, L; Palano, A;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/183057
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