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Measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic end point and determination of │V_(ub)│

Aubert, B. and Chen, E. and Dubois-Felsmann, G. P. and Dvoretskii, A. and Hitlin, D. G. and Minamora, J. S. and Narsky, I. and Piatenko, T. and Porter, F. C. and Ryd, A. and Samuel, A. (2006) Measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic end point and determination of │V_(ub)│. Physical Review D, 73 (1). Art. No. 012006. ISSN 1550-7998. https://resolver.caltech.edu/CaltechAUTHORS:20170714-152333122

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Abstract

We present a measurement of the inclusive electron spectrum in B → X_ueν decays near the kinematic limit for B → X_ceν transitions, using a sample of 88 × 10^6 BB pairs recorded by the BABAR detector at the Υ (4S resonance. Partial branching fraction measurements are performed in five overlapping intervals of the electron momentum; for the interval of 2.0 – 2.6 GeV/c we obtain ΔB (B → X_ueν) = (0.572 ± 0.041_(stat) ± 0.065_(syst)) × 10^(−3). Combining this result with shape function parameters extracted from BABAR measurements of moments of the inclusive photon spectrum in B → X_sγ decays and moments of the hadron-mass and lepton-energy spectra in B → X_cℓν decays we determine │Vub|= (4.44 ± 0.25 + 0.4_( exp−0.38SF) ± 0.22_(theory)) × 10^(−3). Here the first error represents the combined statistical and systematic experimental uncertainties of the partial branching fraction measurement, the second error refers to the uncertainty of the determination of the shape function parameters, and the third error is due to theoretical uncertainties in the QCD calculations.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevD.73.012006DOIArticle
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.73.012006PublisherArticle
ORCID:
AuthorORCID
Dubois-Felsmann, G. P.0000-0003-1598-6979
Hitlin, D. G.0000-0003-4028-6982
Porter, F. C.0000-0003-1948-8889
Additional Information:© 2006 American Physical Society. Received 6 October 2005; published 26 January 2006. We would like to thank the CLEO and Belle Collaborations for providing detailed information on the extraction of the shape function parameters from the photon spectrum in b → sy transitions. We are also indebted to M. Neubert and his coauthors B. Lange, G. Paz, and S. Bosch for providing us with detailed information on their calculations. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), Institute of High Energy Physics (China), the Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Science and Technology of the Russian Federation, and the Particle Physics and Astronomy Research Council (United Kingdom). Individuals have received support from CONACyT (Mexico), the A. P. Sloan Foundation, the Research Corporation, and the Alexander von Humboldt Foundation.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Institute of High Energy Physics (China)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Science and Technology of the Russian FederationUNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Consejo Nacional de Ciencia y Tecnología (CONACyT)UNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Research CorporationUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Issue or Number:1
Classification Code:PACS numbers: 13.20.He, 12.15.Hh, 12.38.Qk, 14.40.Nd
Record Number:CaltechAUTHORS:20170714-152333122
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170714-152333122
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79113
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:17 Jul 2017 20:50
Last Modified:09 Mar 2020 13:18

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