Measurements of the Semileptonic Decays \Bb\to D\ell\nub and \Bb\to D^*\ell\nub Using a Global Fit to D X\ell\nub Final States

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Semileptonic {bar B} decays to DX{ell}{bar {nu}} ({ell} = e or {mu}) are selected by reconstructing D{sup 0}{ell} and D{sup +}{ell} combinations from a sample of 230 million {Upsilon}(4S) {yields} B{bar B} decays recorded with the BABAR detector at the PEP-II e{sup +}e{sup -} collider at SLAC. A global fit to these samples in a 3-dimensional space of kinematic variables is used to determine the branching fractions {Beta}(B{sup -} {yields} D{sup 0}{ell}{bar {nu}}) = 2.36 {+-} 0.03 {+-} 0.12% and {Beta}(B{sup -} {yields} D*{sup 0}{ell}{bar {nu}}) = (5.37 {+-} 0.02 {+-} 0.21)% where the errors are statistical and systematic, respectively. ... continued below

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18 pages

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Aubert, Bernard; Bona, M.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E. et al. August 28, 2008.

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Semileptonic {bar B} decays to DX{ell}{bar {nu}} ({ell} = e or {mu}) are selected by reconstructing D{sup 0}{ell} and D{sup +}{ell} combinations from a sample of 230 million {Upsilon}(4S) {yields} B{bar B} decays recorded with the BABAR detector at the PEP-II e{sup +}e{sup -} collider at SLAC. A global fit to these samples in a 3-dimensional space of kinematic variables is used to determine the branching fractions {Beta}(B{sup -} {yields} D{sup 0}{ell}{bar {nu}}) = 2.36 {+-} 0.03 {+-} 0.12% and {Beta}(B{sup -} {yields} D*{sup 0}{ell}{bar {nu}}) = (5.37 {+-} 0.02 {+-} 0.21)% where the errors are statistical and systematic, respectively. The fit also determines form factor parameters in a HQET-based parameterization, resulting in {rho}{sub D}{sup 2} = 1.22 {+-} 0.04 {+-} 0.07 for {bar B} {yields} D{ell}{bar {nu}} and {rho}{sub D*}{sup 2} = 1.21 {+-} 0.02 {+-} 0.07 for {bar B} {yields} D*{ell}{bar {nu}}. These values are used to obtain the product of the CKM matrix element |V{sub cb}| times the form factor at the zero recoil point for both {bar B} {yields} D{ell}{bar {nu}} decays, G(1)|V{sub cb}| = (43.8 {+-} 0.8 {+-} 2.3) x 10{sup -3}, and for {bar B} {yields} D*{ell}{bar {nu}} decays, F(1)|V{sub cb}| = (35.7 {+-} 0.2 {+-} 1.2) x 10{sup -3}.

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18 pages

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  • Journal Name: Physical Review D

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  • Report No.: SLAC-PUB-13371
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 937180
  • Archival Resource Key: ark:/67531/metadc902738

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  • August 28, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 29, 2016, 7:51 p.m.

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Aubert, Bernard; Bona, M.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E. et al. Measurements of the Semileptonic Decays \Bb\to D\ell\nub and \Bb\to D^*\ell\nub Using a Global Fit to D X\ell\nub Final States, article, August 28, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc902738/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.