Study of B to pi ell nu and B to rho ell nu Decays and Determination of |V_ub|

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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 from ... continued below

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Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al. November 17, 2005.

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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 from lattice QCD and light-cone sum rules, and extract the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V{sub ub}| = (3.82 {+-} 0.14 {+-} 0.22 {+-} 0.11{sub -0.52}{sup +0.88}) x 10{sup -3} from B {yields} {pi}{ell}{nu} where the fourth error reflects the uncertainty of the form-factor normalization.

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8 pages

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  • Journal Name: Physical Review, D (Particles Fields); Journal Volume: 72

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  • Report No.: SLAC-PUB-11053
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878098
  • Archival Resource Key: ark:/67531/metadc877201

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  • November 17, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • July 25, 2017, 9:40 a.m.

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Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al. Study of B to pi ell nu and B to rho ell nu Decays and Determination of |V_ub|, article, November 17, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc877201/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.