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Title: Measurement of the inclusive electron spectrum from B meson decays and determination of | V u b |

Journal Article · · Physical Review D
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Based on the full BABAR data sample of 466.5 million $$B\bar{B}$$ 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 → Xueν decays from the CKM-favored B → Xceν decays, and from various other backgrounds, and determine the total semileptonic branching fraction B (B → Xeν) = ( 10.34 ± 0.04stat ± 0.2 6syst)%, averaged over B± and B0 mesons. We determine the spectrum and branching fraction for charmless B → Xueν decays and extract the CKM element | Vub| , 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 |Vub| are presented, with the lower limit on the electron momentum varied from 0.8 GeV / c to the kinematic endpoint. We determine |Vub| using each of these different calculations and find, |Vub| = ( 3.794 ± 0.107exp $$+ 0.292\atop{ - 0.219 SF}$$ $$+ 0.078 \atop{- 0.068 theory}$$ ) × 10- 3 (De Fazio and Neubert), (4.563 ± 0.126exp $$+ 0.230\atop {- 0.208 SF}$$ $$+ 0.162\atop{- 0.163 theory}$$ ) ×10-3 (Bosch, Lange, Neubert, and Paz), (3.959 ± 0.104exp $$+ 0.164\atop{- 0.154 SF}$$ $$+ 0.042\atop{ - 0.079 theory}$$ ) × 10-3 (Gambino, Giordano, Ossola, and Uraltsev), (3.848 ± 0.108exp $$+ 0.084\atop{ - 0.070 theory}$$) × 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.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
BaBar Collaboration
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1393215
Alternate ID(s):
OSTI ID: 1349966; OSTI ID: 1361064
Journal Information:
Physical Review D, Vol. 95, Issue 7; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (3)

Opportunities for Lattice QCD in quark and lepton flavor physics journal November 2019
Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016 journal December 2017
Opportunities for lattice QCD in quark and lepton flavor physics text January 2019

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