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Título

Measurement of Semileptonic B Decays into Orbitally Excited Charmed Mesons

AutorBabar Collaboration; Azzolini, Virginia; López-March, Neus ; Martínez-Vidal, Fernando ; Milanés, Diego A. ; Oyanguren, Arantza ; Aubert, B.
Fecha de publicación31-jul-2009
EditorAmerican Physical Society
CitaciónPhysical Review Letters 103 (5): 051803 (2009)
ResumenWe present a study of B decays into semileptonic final states containing charged and neutral D-1(2420) and D-2*(2460). The analysis is based on a data sample of 208 fb(-1) collected at the Y(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. With a simultaneous fit to four different decay chains, the semileptonic branching fractions are extracted from measurements of the mass difference Delta m = m(D**) - m(D) distribution. Product branching fractions are determined to be B(B+ -> D(1)(0)l(+)nu(l)) x B(D-1(0) -> D*+pi(-)) = (2.97 +/- 0.17 +/- 0.17) x 10(-3), B(B+ -> D-2*l(+)nu(e)) x B(D-2*(0) -> D(*)+pi(-)) = (2.29 +/- 0.23 +/- 0.21) x 10(-3), B(B-0 -> D(1)(-)l(+)nu(l)) x B(D-1(-) -> D*(0)pi(-)) = (2.78 +/- 0.24 +/- 0.25) x 10(-3) and B(B-0 -> D-2*(-)l(+)nu(l)) x B(D-2(*-) -> D-(*)0 pi(-)) = (1.77 +/- 0.26 +/- 0.11) x 10(-3). In addition we measure the branching ratio Gamma(D2* -> D pi(-))/Gamma(D-2* -> D-(*)pi(-)) = 0.62 +/- 0.03 +/- 0.02.
Versión del editorhttp://dx.doi.org/ 10.1103/PhysRevLett.103.051803
URIhttp://hdl.handle.net/10261/22036
DOI10.1103/PhysRevLett.103.051803
ISSN0031-9007
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