Extraction of |V_ub| with Reduced Dependence on Shape Functions

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

Full Record
Other Related Research

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

Citation Formats


                    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.

Copy to clipboard


                    Golubev, Vladimir B., Skovpen, Yuri, I., /Novosibirsk, IYF, Luth, Vera G., & /SLAC. Extraction of |V_ub| with Reduced Dependence on Shape Functions.  United States.

Copy to clipboard


                    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.

Copy to clipboard


                    
@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}

}

Copy to clipboard

Journal Article:

View Journal Article

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Extraction of |Vub| with Reduced Dependence on Shape Functions

Journal Article 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

Journal Article Golubev, V. B. ; Skovpen, Yu. I. ; Lueth, V. G. ; ... - Physical Review. D, Particles Fields

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.
DOI: 10.1103/PHYSREVD.76.114003
Nuclear dependence of the EMC effect and the extraction of the ratio of neutron to proton structure functions

Journal Article Liuti, S. ; Gross, F. ; Gladshev, V. - AIP Conference Proceedings

The {ital A}-dependence of nuclear deep inelastic structure functions, {ital F}{sup {ital A}}{sub 2}({ital x}), is investigated within the Relativistic Impulse Approximation (RIA). By expanding to first order in the perpendicular momentum squared, {ital k}{sup 2}{sub {perpendicular}}, of the bound nucleons, we are able to fully understand the behavior of {ital F}{sup {ital A}}{sub 2}({ital x}) for {ital x}{gt}0.5. The {ital A}-dependence of nuclear structure functions which emerges from this analysis is used to extract the ratio of the neutron to proton structure functions, {ital R}({ital x})={ital F}{sup {ital n}}{sub 2}({ital x})/{ital F}{sup {ital p}}{sub 2}({ital x}) at {ital x}{r_arrow}1,more »« less
DOI: 10.1063/1.48092
Study of B to pi ell nu and B to rho ell nu Decays and Determination of |V_ub|

Journal Article Aubert, B. ; Barate, R. ; Boutigny, D. ; ... - Physical Review, D (Particles Fields)

We present an analysis of exclusive charmless semileptonic B-meson decays based on 83 million B{bar B} pairs recorded with the BABAR detector at the {Upsilon}(4S) resonance. Using isospin symmetry, we measure branching fractions {Beta}(B{sup 0} {yields} {pi}{sup -}{ell}{sup +}{nu}) = (1.38 {+-} 0.10 {+-} 0.16 {+-} 0.08) x 10{sup -4} and {Beta}(B{sup 0} {yields} {rho}{sup -}{ell}{sup +}{nu}) = (2.14 {+-} 0.21 {+-} 0.48 {+-} 0.28) x 10{sup -4}, where the errors are statistical, experimental systematic, and due to form-factor shape uncertainties. We compare the measured distribution in q{sup 2}, the momentum-transfer squared, with theoretical predictions for the form factors frommore »« less
DOI: 10.1103/PhysRevD.72.051102

Full Text Available
Study of B to pi l nu and B to rho l nu Decays and Determination of |V_ub|

Journal Article del Amo Sanchez, P. ; Lees, J.P. ; Poireau, V. ; ... - Phys.Rev.D83:032007,2011

We present an analysis of exclusive charmless semileptonic B-meson decays based on 377 million B{bar B} pairs recorded with the BABAR detector at the {Upsilon} (4S) resonance. We select four event samples corresponding to the decay modes B{sup 0} {yields} {pi}{sup -}{ell}{sup +}{nu}, B{sup +} {yields} {pi}{sup 0}{ell}{sup +}{nu}, B{sup 0} {yields} {rho}{sup -}{ell}{sup +}{nu}, and B{sup +} {yields} {rho}{sup 0}{ell}{sup +}{nu}, and find the measured branching fractions to be consistent with isospin symmetry. Assuming isospin symmetry, we combine the two B {yields} {pi}{ell}{nu} samples, and similarly the two B {yields} {rho}{ell}{nu} samples, and measure the branching fractions {Beta}(B{sup 0}more »« less
DOI: 10.1103/PhysRevD.83.032007

Full Text Available

Similar Records