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Title: | Measurement of the B0 --> pi- l+ nu and B+ --> pi0 l+ nu Branching Fractions and Determination of |V_ub| in Y(4S) Events Tagged by a Fully Reconstructed B Meson |
Authors: | Aubert, B Kyberd, P |
Citation: | Aubert, B. et al. for the benefit if the TBABAR Collaboration (2005) 'Measurement of the B0 --> pi- l+ nu and B+ --> pi0 l+ nu Branching Fractions and Determination of |V_ub| in Y(4S) Events Tagged by a Fully Reconstructed B Meson', arXiv:hep-ex/0507085v2 , pp. 1 - 20. doi: 10.48550/arXiv.hep-ex/0507085. |
Abstract: | We report preliminary measurements of the charmless exclusive semileptonic branching fractions of the B0 --> pi- l+ nu and B+ --> pi0 l+ nu decays, based on 211 fb-1 of data collected at the Y(4S) resonance by the BABAR detector. In events in which the decay of one B meson to a hadronic final state is fully reconstructed, the semileptonic decay of the second B meson is identified by the detection of a charged lepton and a pion. We measure the partial branching fractions for B0 --> pi- l+ nu and B+ --> pi0 l+ nu in three regions of the invariant mass squared of the lepton pair, and we obtain the total branching fractions BF(B0 --> pi- l+ nu) = (1.14 +/- 0.27(stat) +/- 0.17(syst)) x 10^-4 and BF(B+ --> pi0 l+ nu) = (0.86 +/- 0.22(stat) +/- 0.11(syst)) x 10^-4. Using isospin symmetry, we measure the combined total branching fraction BF(B0 --> pi- l+ nu) = (1.28 +/- 0.23(stat) +/- 0.16(syst)) x 10^-4. Theoretical predictions of the form-factor are used to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |V_ub| = (3.7 +/- 0.3(stat) +/- 0.2(syst) +0.8-0.5(FF)) x 10^-3, where the last error is due to the form-factor normalization. |
Description: | Presented at EPS International Europhysics Conference on High Energy Physics (HEP-EPS 2005), Lisbon, Portugal, 21-27 Jul 2005. Comments: 20 pages, 11 postscript figures, submitted to HEP 2005. Report number: BABAR-CONF-05/17, SLAC-PUB-11369. |
URI: | https://bura.brunel.ac.uk/handle/2438/19594 |
DOI: | https://doi.org/10.48550/arXiv.hep-ex/0507085 |
ISSN: | 2331-8422 |
Other Identifiers: | arXiv:hep-ex/0507085v2 BABAR-CONF-05/17 SLAC-PUB-11369 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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0507085v2.pdf | 253.4 kB | Adobe PDF | View/Open |
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