Study of Inclusive And Exclusive B ---> X/U L Nu Decays And the Measurement of |V(Ub)| With the BaBar Detector

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We report studies of B {yields} X{sub u}{ell}{nu} decays, based on a sample of 88 million B{bar B} events recorded with the BABAR detector. From both tagged and untagged B{bar B} events we have isolated inclusive charmless decays in kinematic regions for which the dominant background from B {yields} X{sub c}{ell}{nu} is reduced by making requirements on different variables: the electron energy E{sub l}, the momentum transfer q{sup 2}, and the hadronic mass m{sub X}. Using theoretical calculations we extrapolate to the total decay rate to determine the CKM matrix element |V{sub ub}|. In addition, we have measured the branching ... continued below

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5 pages

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del Re, D. & /UC, San Diego October 12, 2005.

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We report studies of B {yields} X{sub u}{ell}{nu} decays, based on a sample of 88 million B{bar B} events recorded with the BABAR detector. From both tagged and untagged B{bar B} events we have isolated inclusive charmless decays in kinematic regions for which the dominant background from B {yields} X{sub c}{ell}{nu} is reduced by making requirements on different variables: the electron energy E{sub l}, the momentum transfer q{sup 2}, and the hadronic mass m{sub X}. Using theoretical calculations we extrapolate to the total decay rate to determine the CKM matrix element |V{sub ub}|. In addition, we have measured the branching fraction for exclusive semileptonic decays, such as B {yields} {pi}({rho}, {omega}, {eta}, a{sub 0}){ell}{nu}. A high signal purity is achieved by selecting events in which a decay of the second B meson is either fully or partially reconstructed.

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5 pages

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  • Prepared for 32nd International Conference on High-Energy Physics (ICHEP 04), Beijing, China, 16-22 Aug 2004

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  • Report No.: SLAC-PUB-11525
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878070
  • Archival Resource Key: ark:/67531/metadc879023

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  • October 12, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 12:59 p.m.

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del Re, D. & /UC, San Diego. Study of Inclusive And Exclusive B ---> X/U L Nu Decays And the Measurement of |V(Ub)| With the BaBar Detector, article, October 12, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc879023/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.