We report the results of a study of the exclusive charmless semileptonic decays, B(+) -> eta(l)l(+)nu and B(0) -> pi(-)l(+)nu undertaken with approximately 464 x 10(6) B (B) over bar pairs collected at the Y(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions for B(+) -> eta l(+)nu and B(0) -> pi(-)l(+)nu decays in three and 12 bins of q(2), respectively, from which we extract the f (+)(q(2)) form-factor shapes and the total branching fractions B(B(+) -> eta l(+)nu)= (0.36 +/- 0.05(stat) +/- 0.04(syst)) x 10(-4) and B(B(0) -> pi(-)l(+)nu) = (1.42 +/- 0.05(stat) +/- 0.07(syst)) x 10(-4). We also measure B(B(+) -> eta'l(+)nu) = (0.24 +/- 0.08(stat) +/- 0.03(syst)) x 10(-4). We obtain values for the magnitude of the CKM matrix element |V(ub)| using three different QCD calculations.

Measurement of the B(0) -> pi(-)l(+)nu and B(+) -> eta(l)l(+)nu branching fractions, the B(0) -> pi(-)l(+)nu and B(+) -> eta l(+)nu form- factor shapes, and determination of vertical bar V(ub)vertical bar RID C-5223-2009

BIANCHI, Fabrizio;GAMBA, Diego;PELLICCIONI, Mario;
2011-01-01

Abstract

We report the results of a study of the exclusive charmless semileptonic decays, B(+) -> eta(l)l(+)nu and B(0) -> pi(-)l(+)nu undertaken with approximately 464 x 10(6) B (B) over bar pairs collected at the Y(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions for B(+) -> eta l(+)nu and B(0) -> pi(-)l(+)nu decays in three and 12 bins of q(2), respectively, from which we extract the f (+)(q(2)) form-factor shapes and the total branching fractions B(B(+) -> eta l(+)nu)= (0.36 +/- 0.05(stat) +/- 0.04(syst)) x 10(-4) and B(B(0) -> pi(-)l(+)nu) = (1.42 +/- 0.05(stat) +/- 0.07(syst)) x 10(-4). We also measure B(B(+) -> eta'l(+)nu) = (0.24 +/- 0.08(stat) +/- 0.03(syst)) x 10(-4). We obtain values for the magnitude of the CKM matrix element |V(ub)| using three different QCD calculations.
2011
83
052011
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P. D. Sanchez;J. P. Lees;V. Poireau;E. Prencipe;V. Tisserand;J. G. Tico;E. Grauges;M. Martinelli;D. A. Milanes;A. Palano;M. Pappagallo;G. Eigen;B. Stugu;L. Sun;D. N. Brown;L. T. Kerth;Y. G. Kolomensky;G. Lynch;I. L. Osipenkov;H. Koch;T. Schroeder;D. J. Asgeirsson;C. Hearty;T. S. Mattison;J. A. McKenna;A. Khan;A. Randle-Conde;V. E. Blinov;A. R. Buzykaev;V. P. Druzhinin;V. B. Golubev;E. A. Kravchenko;A. P. Onuchin;S. I. Serednyakov;Y. I. Skovpen;E. P. Solodov;K. Y. Todyshev;A. N. Yushkov;M. Bondioli;S. Curry;D. Kirkby;A. J. Lankford;M. Mandelkern;E. C. Martin;D. P. Stoker;H. Atmacan;J. W. Gary;F. Liu;O. Long;G. M. Vitug;C. Campagnari;T. M. Hong;D. Kovalskyi;J. D. Richman;C. West;A. M. Eisner;C. A. Heusch;J. Kroseberg;W. S. Lockman;A. J. Martinez;T. Schalk;B. A. Schumm;A. Seiden;L. O. Winstrom;C. H. Cheng;D. A. Doll;B. Echenard;D. G. Hitlin;P. Ongmongkolkul;F. C. Porter;A. Y. Rakitin;R. Andreassen;M. S. Dubrovin;G. Mancinelli;B. T. Meadows;M. D. Sokoloff;P. C. Bloom;W. T. Ford;A. Gaz;M. 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G.;S. Li;B. Lindquist;S. Luitz;H. L. Lynch;D. B. MacFarlane;H. Marsiske;D. R. Muller;H. Neal;S. Nelson;C. P. O'Grady;I. Ofte;M. Perl;T. Pulliam;B. N. Ratcliff;A. Roodman;A. A. Salnikov;V. Santoro;R. H. Schindler;J. Schwiening;A. Snyder;D. Su;M. K. Sullivan;S. Sun;K. Suzuki;J. M. Thompson;J. Va'vra;A. P. Wagner;M. Weaver;W. J. Wisniewski;M. Wittgen;D. H. Wright;H. W. Wulsin;A. K. Yarritu;C. C. Young;V. Ziegler;X. R. Chen;W. Park;M. V. Purohit;R. M. White;J. R. Wilson;S. J. Sekula;M. Bellis;P. R. Burchat;A. J. Edwards;T. S. Miyashita;S. Ahmed;M. S. Alam;J. A. Ernst;B. Pan;M. A. Saeed;S. B. Zain;N. Guttman;A. Soffer;P. Lund;S. M. Spanier;R. Eckmann;J. L. Ritchie;A. M. Ruland;C. J. Schilling;R. F. Schwitters;B. C. Wray;J. M. Izen;X. C. Lou;F. Bianchi;D. Gamba;M. Pelliccioni;M. Bomben;L. Lanceri;L. Vitale;N. Lopez-March;F. Martinez-Vidal;A. Oyanguren;J. Albert;S. Banerjee;H. H. F.;K. Hamano;G. J. King;R. Kowalewski;M. J. Lewczuk;C. Lindsay;I. M. Nugent;J. M. Roney;R. J. Sobie;T. J. 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