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We report on measurements of the decays of B¯ mesons into the semileptonic final states B¯→D^(*)π^(+)π^(-)ℓ^(-)ν¯, where D^(*) represents a D or D^(*) meson and ℓ^(-) is an electron or a muon. These measurements are based on 471×10^(6) BB ¯ pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R_π^+π^-^(*)=B(B[over ¯]→D^(*)π^+π^-ℓ^-ν[over ¯])/B(B[over ¯]→D^(*)ℓ^-ν[over ¯]) using events in which the second B meson is fully reconstructed. We find R_π^+π^-=0.067±0.010±0.008 and R_π^+π^-^*=0.019±0.005±0.004, where the first uncertainty is statistical and the second is systematic. Based on these results and assuming isospin invariance, we estimate that B[over ¯]→D^(*)ππℓ^-ν[over ¯] decays, where π denotes either a π^± and π^0 meson, account for up to half the difference between the measured inclusive semileptonic branching fraction to charm hadrons and the corresponding sum of previously measured exclusive branching fractions.

Observation of B→D(*) π^(+)π^(-)ℓ^(-)ν Decays in e^(+)e^(-) Collisions at the Υ(4S) Resonance / Lees, J.P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D.N., Kerth, L.T., Kolomensky, Y.G., Lee, M.J., Lynch, G., Koch, H., Schroeder, T., Hearty, C., Mattison, T.S., Mckenna, J.A., So, R.Y., Khan, A., Blinov, V.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 116:4(2016), p. 041801. [10.1103/PhysRevLett.116.041801]

Observation of B→D(*) π^(+)π^(-)ℓ^(-)ν Decays in e^(+)e^(-) Collisions at the Υ(4S) Resonance

DE NARDO, GUGLIELMO;
2016

Abstract

We report on measurements of the decays of B¯ mesons into the semileptonic final states B¯→D^(*)π^(+)π^(-)ℓ^(-)ν¯, where D^(*) represents a D or D^(*) meson and ℓ^(-) is an electron or a muon. These measurements are based on 471×10^(6) BB ¯ pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R_π^+π^-^(*)=B(B[over ¯]→D^(*)π^+π^-ℓ^-ν[over ¯])/B(B[over ¯]→D^(*)ℓ^-ν[over ¯]) using events in which the second B meson is fully reconstructed. We find R_π^+π^-=0.067±0.010±0.008 and R_π^+π^-^*=0.019±0.005±0.004, where the first uncertainty is statistical and the second is systematic. Based on these results and assuming isospin invariance, we estimate that B[over ¯]→D^(*)ππℓ^-ν[over ¯] decays, where π denotes either a π^± and π^0 meson, account for up to half the difference between the measured inclusive semileptonic branching fraction to charm hadrons and the corresponding sum of previously measured exclusive branching fractions.
2016
Observation of B→D(*) π^(+)π^(-)ℓ^(-)ν Decays in e^(+)e^(-) Collisions at the Υ(4S) Resonance / Lees, J.P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D.N., Kerth, L.T., Kolomensky, Y.G., Lee, M.J., Lynch, G., Koch, H., Schroeder, T., Hearty, C., Mattison, T.S., Mckenna, J.A., So, R.Y., Khan, A., Blinov, V.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 116:4(2016), p. 041801. [10.1103/PhysRevLett.116.041801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/670845
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