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Title: Determining V{sub ub} from B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}}

Abstract

It was recently pointed out that the decays B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}{gamma} and B{sup +}{r_arrow}D{sup {asterisk}+}{gamma} can be used for an extraction of {vert_bar}V{sub ub}{vert_bar}. The theory of these decays is poorly understood. It was shown that in a world of almost degenerate {ital b} and {ital c} quarks the decay would be computable. The severe difficulties that are encountered in the realistic calculation stem primarily from the very hard photon produced in the two body decay. We point out that in the decays B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}} the photon vertex is soft when the charmed meson is nearly at rest (in the B{sup +} rest frame). This allows us to compute with some confidence the decay rate in a restricted but interesting kinematic regime. Given enough data the extraction of V{sub ub} with reasonably small uncertainties could proceed through an analysis of these exclusive decays much as is done in the determination of V{sub cb}. {copyright} {ital 1999} {ital The American Physical Society}

Authors:
; ;  [1]
  1. Department of Physics, University of California at San Diego, La Jolla, California 92093 (United States)
Publication Date:
OSTI Identifier:
362736
Resource Type:
Journal Article
Journal Name:
Physical Review, D
Additional Journal Information:
Journal Volume: 60; Journal Issue: 5; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; B MESONS; STANDARD MODEL; B PLUS MESONS; D PLUS MESONS; PAIR PRODUCTION; ELECTRONS; POSITRONS; PARTICLE DECAY; SEMILEPTONIC DECAY

Citation Formats

Evans, D.H., Grinstein, B., and Nolte, D.R. Determining V{sub ub} from B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}}. United States: N. p., 1999. Web. doi:10.1103/PhysRevD.60.057301.
Evans, D.H., Grinstein, B., & Nolte, D.R. Determining V{sub ub} from B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}}. United States. doi:10.1103/PhysRevD.60.057301.
Evans, D.H., Grinstein, B., and Nolte, D.R. Wed . "Determining V{sub ub} from B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}}". United States. doi:10.1103/PhysRevD.60.057301.
@article{osti_362736,
title = {Determining V{sub ub} from B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}}},
author = {Evans, D.H. and Grinstein, B. and Nolte, D.R.},
abstractNote = {It was recently pointed out that the decays B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}{gamma} and B{sup +}{r_arrow}D{sup {asterisk}+}{gamma} can be used for an extraction of {vert_bar}V{sub ub}{vert_bar}. The theory of these decays is poorly understood. It was shown that in a world of almost degenerate {ital b} and {ital c} quarks the decay would be computable. The severe difficulties that are encountered in the realistic calculation stem primarily from the very hard photon produced in the two body decay. We point out that in the decays B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}} the photon vertex is soft when the charmed meson is nearly at rest (in the B{sup +} rest frame). This allows us to compute with some confidence the decay rate in a restricted but interesting kinematic regime. Given enough data the extraction of V{sub ub} with reasonably small uncertainties could proceed through an analysis of these exclusive decays much as is done in the determination of V{sub cb}. {copyright} {ital 1999} {ital The American Physical Society}},
doi = {10.1103/PhysRevD.60.057301},
journal = {Physical Review, D},
number = 5,
volume = 60,
place = {United States},
year = {1999},
month = {9}
}