Measurement of the D⁰ → π⁻e⁺ν_e Differential Decay Branching Fraction as a Function of q² and Study of Form Factor Parametrizations

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dc.contributor.Scopus56366505900 (Lou, X)en_US
dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.authorLees, J. P.en_US
dc.contributor.authorPoireau, V.en_US
dc.contributor.authorTisserand, V.en_US
dc.contributor.authorGrauges, E.en_US
dc.contributor.authorPalano, A.en_US
dc.contributor.authorEigen, G.en_US
dc.contributor.authorStugu, B.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorBaBar Collaborationen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.date.accessioned2015-09-29T15:47:03Z
dc.date.available2015-09-29T15:47:03Z
dc.date.created2015-03-31en_US
dc.date.issued2015-03-31en_US
dc.description.abstractBased on a sample of 500 million e⁺e⁻ → cc̅ events recorded by the BABAR detector at c. m. energies of close to 10.6 GeV, we report on a study of the decay D⁰ → π⁻e⁺ν(e⁻). We measure the ratio of branching fractions, R(D) = ℬ(D⁰ → π⁻e⁺ν(e)) / ℬ(D⁰ → K⁻ π⁺) = 0.0713 ± 0.0017(stat) ± 0.0024(syst) and use the present world average for B(D⁰ → K⁻π⁺) to obtain ℬ(D⁰ → π⁻e⁺ν(e)) = (2.770 ± 0.068(stat) ± 0.092(syst) ± 0.037(ext)) x 10⁻³ where the third error accounts for the uncertainty on the branching fraction for the reference channel. The measured dependence of the differential branching fraction on q², the four-momentum transfer squared between the D and the π meson, is compared to various theoretical predictions for the hadronic form factor, (f^(π)(+,D))(q²), and the normalization |V(cd)| x (f^(π)(+,D)(q² = 0) = 0.1374 ± 0.0038(stat) ± 0.0022(syst) ± 0.0009(ext⋅) is extracted from a fit to data. Using the most recent LQCD prediction of (f^(π))(+,D)(q²) = 0) = 0.666 ± 0.029, we obtain |V(cd)| = 0.206 ± 0.007(exp) ± 0.009(LQCD). Assuming, instead, |V(cd)| = |V(us)| = 0.2252 ± 0.0009, we obtain (f^(π))(+,D)(q²) = 0) = 0.610 ± 0.020(exp) ± 0.005(ext⋅). The q² dependence of f^(π)(+,D)(q² = 0) is compared to a variety of multipole parametrizations. This information is applied to B⁰ → π⁻e⁺ν(e) decays and, combined with an earlier B⁰ → π⁻e⁺ν(e) measurement by BABAR, is used to derive estimates of |V(ub)|.en_US
dc.identifier.bibliographicCitationLees, J. P., V. Poireau, V. Tisserand, E. Grauges, et al. 2015. "Measurement of the D⁰ → π⁻e⁺ν_e differential decay branching fraction as a function of q² and study of form factor parametrizations." Physical Review D 91(5): doi:10.1103/PhysRevD.91.052022.en_US
dc.identifier.issn1550-7998en_US
dc.identifier.issue5en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4645
dc.identifier.volume91en_US
dc.language.isoen_USen_US
dc.publisherAmer Physical Socen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevD.91.052022
dc.rights©2015 American Physical Societyen_US
dc.sourcePhysical Review D
dc.subjectSemileptonic decaysen_US
dc.subjectMesons--Decayen_US
dc.subjectRadiative correctionsen_US
dc.subjectQuark modelsen_US
dc.subjectQuantum chromodynamicsen_US
dc.subjectBranching fractions (Nuclear physics)en_US
dc.titleMeasurement of the D⁰ → π⁻e⁺ν_e Differential Decay Branching Fraction as a Function of q² and Study of Form Factor Parametrizationsen_US
dc.typeTexten_US
dc.type.genreArticleen_US

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