Extraction of |V_ub| with Reduced Dependence on Shape Functions

Title: Extraction of |V_ub| with Reduced Dependence on Shape Functions

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Abstract

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.

Authors:: Golubev, Vladimir B.; Skovpen, Yuri, I.; /Novosibirsk, IYF; Luth, Vera G.; /SLAC

Publication Date:: Tue Mar 06 00:00:00 EST 2007

Research Org.:: Stanford Linear Accelerator Center (SLAC)

Sponsoring Org.:: USDOE

OSTI Identifier:: 900600

Report Number(s):: SLAC-PUB-12336
hep-ph/0702072; TRN: US0702344

DOE Contract Number:: AC02-76SF00515

Resource Type:: Journal Article

Resource Relation:: Journal Name: hep-ph

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRONS; LEPTONS; MATRIX ELEMENTS; PHOTONS; SHAPE; Phenomenology-HEP,HEPEX, HEPPH

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                    Golubev, Vladimir B., Skovpen, Yuri, I., /Novosibirsk, IYF, Luth, Vera G., and /SLAC. Extraction of |V_ub| with Reduced Dependence on Shape Functions.  United States: N. p., 2007. 
        Web.

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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.  United States.

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                    Golubev, Vladimir B., Skovpen, Yuri, I., /Novosibirsk, IYF, Luth, Vera G., and /SLAC. Tue .  
        "Extraction of |V_ub| with Reduced Dependence on Shape Functions".  United States.  
        doi:.  https://www.osti.gov/servlets/purl/900600.

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@article{osti_900600,

  title        = {Extraction of |V_ub| with Reduced Dependence on Shape Functions},

  author       = {Golubev, Vladimir B. and Skovpen, Yuri, I. and /Novosibirsk, IYF and Luth, Vera G. and /SLAC},

  abstractNote = {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.},

  doi          = {},

  journal      = {hep-ph},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Mar 06 00:00:00 EST 2007},

  month        = {Tue Mar 06 00:00:00 EST 2007}

}

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Extraction of |Vub| with Reduced Dependence on Shape Functions

Golubev, V - Physical Review D

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 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 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 errorsmore » on the lepton spectrum.« less
DOI: 10.1103/PhysRevD.76.114003

Full Text Available
Extraction of |V{sub 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 Cabibbo-Kobayashi-Maskawa matrix element V{sub ub}. The extraction is based on 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 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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