Measurement of |Vcb| and the Form-Factor Slope for BBar -> Dlnu Decays on the Recoil of Fully Reconstructed B Mesons

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We present a measurement of the CKM matrix element |V{sub cb}| and the form-factor slope {rho}{sup 2} for {bar B} {yields} D{ell}{sup -} {bar {nu}}{sub {ell}} decays based on 417 fb{sup -1} of data collected at the {Upsilon}(4S) resonance with the BABAR detector. The semileptonic decays are selected in B{bar B} events in which the hadronic decay of the second B meson is fully reconstructed. From the measured differential decay rate of the signal decay we determine G(1)|V{sub cb}| = (43.0 {+-} 1.9 {+-} 1.4) x 10{sup -3}, {rho}{sup 2} = 1.20 {+-} 0.09 {+-} 0.04, where G(1) is the ... continued below

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18 pages

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Aubert, B August 21, 2008.

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We present a measurement of the CKM matrix element |V{sub cb}| and the form-factor slope {rho}{sup 2} for {bar B} {yields} D{ell}{sup -} {bar {nu}}{sub {ell}} decays based on 417 fb{sup -1} of data collected at the {Upsilon}(4S) resonance with the BABAR detector. The semileptonic decays are selected in B{bar B} events in which the hadronic decay of the second B meson is fully reconstructed. From the measured differential decay rate of the signal decay we determine G(1)|V{sub cb}| = (43.0 {+-} 1.9 {+-} 1.4) x 10{sup -3}, {rho}{sup 2} = 1.20 {+-} 0.09 {+-} 0.04, where G(1) is the hadronic form factor at the point of zero recoil. Using a lattice calculation for G(1) we extract |V{sub cb}| = (39.8 {+-} 1.8 {+-} 1.3 {+-} 0.9) x 10{sup -3}, where the stated errors refer to the statistical, systematic, and form factor uncertainties. We also present a measurement of the exclusive branching fractions, {Beta}(B{sup -} {yields} D{sup 0} {ell}{sup -} {bar {nu}}{sub {ell}}) = (2.31 {+-} 0.08 {+-} 0.07)% and {Beta}({bar B}{sup 0} {yields} D{sup +} {ell}{sup -} {bar {nu}}{sub {ell}}) = (2.23 {+-} 0.11 {+-} 0.08)%.

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18 pages

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  • To appear in the proceedings of 34th International Conference on High Energy Physics (ICHEP 2008), Philadelphia, Pennsylvania, 30 Jul - 5 Aug 2008

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  • Report No.: SLAC-PUB-13334
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 937192
  • Archival Resource Key: ark:/67531/metadc896250

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  • August 21, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 6, 2016, 1:11 p.m.

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Aubert, B. Measurement of |Vcb| and the Form-Factor Slope for BBar -> Dlnu Decays on the Recoil of Fully Reconstructed B Mesons, article, August 21, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc896250/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.