Journal
PHYSICAL REVIEW D
Volume 95, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.95.072001
Keywords
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Funding
- U.S. Department of Energy and National Science Foundation
- Natural Sciences and Engineering Research Council (Canada)
- Commissariat a l'Energie Atomique
- Bundesministerium fur Bildung und Forschung
- Istituto Nazionale di Fisica Nucleare (Italy)
- Foundation for Fundamental Research on Matter (The Netherlands)
- Research Council of Norway
- Ministry of Education and Science of the Russian Federation
- Science and Technology Facilities Council (United Kingdom)
- Marie-Curie IEF program (European Union)
- A. P. Sloan Foundation (USA)
- Ministerio de Economia y Competitividad (Spain)
- Deutsche Forschungsgemeinschaft (Germany)
- Institut National de Physique Nucleaire et de Physique des Particules (France)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1404070] Funding Source: National Science Foundation
- STFC [ST/N000420/1] Funding Source: UKRI
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Based on the full BABAR data sample of 466.5 million B (B) over bar pairs, we present measurements of the electron spectrum from semileptonic B meson decays. We fit the inclusive electron spectrum to distinguish Cabibbo-Kobayashi-Maskawa (CKM) suppressed B -> X(u)ev decays from the CKM-favored B -> X(u)ev decays, and from various other backgrounds, and determine the total semileptonic branching fraction B(B -> X(u)ev) = (10.34 +/- 0.04(stat) +/- 0.26(syst))%, averaged over B-+/- and B-0 mesons. We determine the spectrum and branching fraction for charmless B -> X(u)ev decays and extract the CKM element vertical bar V-ub vertical bar, by relying on four different QCD calculations based on the heavy quark expansion. While experimentally, the electron momentum region above 2.1 GeV/c is favored, because the background is relatively low, the uncertainties for the theoretical predictions are largest in the region near the kinematic endpoint. Detailed studies to assess the impact of these four predictions on the measurements of the electron spectrum, the branching fraction, and the extraction of the CKM matrix element vertical bar V-ub vertical bar are presented, with the lower limit on the electron momentum varied from 0.8 GeV/c to the kinematic endpoint. We determine V-ub vertical bar using each of these different calculations and find, vertical bar V-ub vertical bar = (3.794 +/- 0.107(exp) (+0.292)(-0.219) (SF) (+0.078)(-0.068)theory) x 10(-3) (De Fazio and Neubert), (4.563 +/- 0.126(exp) (+0.230)(+0.162)(-0.208)(-0.163)theory) x 10(-3) (Bosch, Lange, Neubert, and Paz), (3.959 +/- 0.104(exp -0.154)(SF-0.079)(+0.164)(+0.042) theory )x 10(-3) (Gambino, Giordano, Ossola, and Uraltsev), (3.848 +/- 0.108(exp -0.070)(theory)(+0.084)) x 10(-3) (dressed gluon exponentiation), where the stated uncertainties refer to the experimental uncertainties of the partial branching fraction measurement, the shape function parameters, and the theoretical calculations.
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