Extraction of |V_ub| with Reduced Dependence on Shape Functions

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Using BABAR measurements of the inclusive electron spectrum in B {yields} X{sub u}e{nu} decays and the inclusive photon spectrum in B {yields} X{sub s}{gamma} decays, we extract the magnitude of the CKM matrix element V{sub ub}. The extraction is based on several theoretical calculations designed to reduce the theoretical uncertainties by exploiting the assumption that the leading shape functions are the same for all b {yields} q transitions (q is a light quark). The current results agree well with the previous analysis, have indeed smaller theoretical errors, but are presently limited by the knowledge of the photon spectrum and the ... continued below

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14 pages

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Golubev, Vladimir B.; Skovpen, Yuri, I.; /Novosibirsk, IYF; Luth, Vera G. & /SLAC March 6, 2007.

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Using BABAR measurements of the inclusive electron spectrum in B {yields} X{sub u}e{nu} decays and the inclusive photon spectrum in B {yields} X{sub s}{gamma} decays, we extract the magnitude of the CKM matrix element V{sub ub}. The extraction is based on several theoretical calculations designed to reduce the theoretical uncertainties by exploiting the assumption that the leading shape functions are the same for all b {yields} q transitions (q is a light quark). The current results agree well with the previous analysis, have indeed smaller theoretical errors, but are presently limited by the knowledge of the photon spectrum and the experimental errors on the lepton spectrum.

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14 pages

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  • Journal Name: hep-ph

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  • Report No.: SLAC-PUB-12336
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 900600
  • Archival Resource Key: ark:/67531/metadc889074

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  • March 6, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 11:29 a.m.

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Golubev, Vladimir B.; Skovpen, Yuri, I.; /Novosibirsk, IYF; Luth, Vera G. & /SLAC. Extraction of |V_ub| with Reduced Dependence on Shape Functions, article, March 6, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc889074/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.