학술논문
Measurement of the B0→π-l+ν Form-Factor Shape and Branching Fraction, and Determination of |Vub| with a Loose Neutrino Reconstruction Technique
Document Type
article
Author
Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, JP; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A; Grauges, E; Palano, A; Chen, JC; Qi, ND; Rong, G; Wang, P; Zhu, YS; Eigen, G; Ofte, I; Stugu, B; Abrams, GS; Battaglia, M; Brown, DN; Button-Shafer, J; Cahn, RN; Groysman, Y; Jacobsen, RG; Kadyk, JA; Kerth, LT; Kolomensky, Yu G; Kukartsev, G; Pegna, D Lopes; Lynch, G; Mir, LM; Orimoto, TJ; Pripstein, M; Roe, NA; Ronan, MT; Tackmann, K; Wenzel, WA; del Amo Sanchez, P; Barrett, M; Harrison, TJ; Hart, AJ; Hawkes, CM; Watson, AT; Held, T; Koch, H; Lewandowski, B; Pelizaeus, M; Peters, K; Schroeder, T; Steinke, M; Boyd, JT; Burke, JP; Cottingham, WN; Walker, D; Asgeirsson, DJ; Cuhadar-Donszelmann, T; Fulsom, BG; Hearty, C; Knecht, NS; Mattison, TS; McKenna, JA; Khan, A; Kyberd, P; Saleem, M; Sherwood, DJ; Teodorescu, L; Blinov, VE; Bukin, AD; Druzhinin, VP; Golubev, VB; Onuchin, AP; Serednyakov, SI; Skovpen, Yu I; Solodov, EP; Todyshev, K Yu; Bondioli, M; Bruinsma, M; Chao, M; Curry, S; Eschrich, I; Kirkby, D; Lankford, AJ; Lund, P; Mandelkern, M; Martin, EC; Stoker, DP; Abachi, S; Buchanan, C; Foulkes, SD; Gary, JW; Liu, F; Long, O; Shen, BC; Zhang, L; Hill, EJ; Paar, HP; Rahatlou, S; Sharma, V
Source
Physical Review Letters. 98(9)
Subject
Language
Abstract
We report the results of a study of the exclusive charmless semileptonic decay, B0-->pi(-l)(+nu), undertaken with approximately 227 x 10(6) BB pairs collected at the Upsilon(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with an innovative loose neutrino reconstruction technique. We obtain partial branching fractions in 12 bins of q2, the momentum transfer squared, from which we extract the f + (q2) form-factor shape and the total branching fraction B(B0-->pi(-l)(+nu))=(1.46+/-0.07stat+/-0.08syst) x 10(-4). Based on a recent unquenched lattice QCD calculation of the form factor in the range q2>16 GeV2, we find the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element /Vub/ to be (4.1+/-0.2stat +/- 0.2syst(+0.6)-0.4_{FF}) x 10(-3), where the last uncertainty is due to the normalization of the form factor.