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Enhanced subleading structure functions in semileptonic B decay

Leibovich, Adam K. and Ligeti, Zoltan and Wise, Mark B. (2002) Enhanced subleading structure functions in semileptonic B decay. Physics Letters B, 539 (3-4). pp. 242-248. ISSN 0370-2693. https://resolver.caltech.edu/CaltechAUTHORS:20170408-172702759

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Abstract

The charged lepton spectrum in semileptonic B→X_uℓν̄ decay near maximal lepton energy receives important corrections from subleading structure functions that are formally suppressed by powers of Λ_(QCD)/m_b but are enhanced by numerical factors. We investigate the series of higher order terms which smear over a region of width ΔE_ℓ∼Λ_(QCD) near the endpoint the contributions proportional to δ(E_ℓ−(m_b)/2) times (i) the matrix element of the chromomagnetic operator, and (ii) four-quark operators. These contribute to the total rate at the few percent level, but affect the endpoint region much more significantly. Implications for the determination of |V_(ub)| are discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/S0370-2693(02)02097-XDOIArticle
https://www.sciencedirect.com/science/article/pii/S037026930202097XPublisherArticle
https://arxiv.org/abs/hep-ph/0205148arXivDiscussion Paper
ORCID:
AuthorORCID
Ligeti, Zoltan0000-0002-4830-5773
Additional Information:© 2002 Elsevier. Received 17 May 2002, Accepted 8 June 2002, Available online 21 June 2002. Editor: H. Georgi This article is registered under preprint number hep-ph/0205148 We thank Ed Thorndike for helpful discussions. A.K.L. would like to thank the LBL theory group for its hospitality while portions of this work were done. A.K.L. was supported in part by the Department of Energy under Grant DE-AC02-76CH03000. Z.L. was supported in part by the Director, Office of Science, Office of High Energy and Nuclear Physics, Division of High Energy Physics, of the US Department of Energy under Contract DE-AC03-76SF00098. M.B.W. was supported in part by the Department of Energy under Grant No. DE-FG03-92-ER40701.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-76CH03000
Department of Energy (DOE)DE-AC03-76SF00098
Department of Energy (DOE)DE-FG03-92-ER40701
Issue or Number:3-4
Record Number:CaltechAUTHORS:20170408-172702759
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170408-172702759
Official Citation:Adam K. Leibovich, Zoltan Ligeti, Mark B. Wise, Enhanced subleading structure functions in semileptonic B decay, Physics Letters B, Volume 539, Issues 3–4, 2002, Pages 242-248, ISSN 0370-2693, https://doi.org/10.1016/S0370-2693(02)02097-X. (http://www.sciencedirect.com/science/article/pii/S037026930202097X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76347
Collection:CaltechAUTHORS
Deposited By: 1Science Import
Deposited On:29 Mar 2018 22:12
Last Modified:03 Oct 2019 17:00

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