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dc.contributor.authorLees, Jean-Pierre
dc.contributor.authorPoireau, Vincent
dc.contributor.authorTisserand, Vincent
dc.contributor.authorGrauges, Eugeni
dc.contributor.authorPalano, Antimo
dc.contributor.authorEigen, Gerald
dc.contributor.authorBrown, David Nathan
dc.contributor.authorKolomensky, Yury G.
dc.contributor.authorFritsch, Miriam
dc.contributor.authorKoch, Helmut
dc.contributor.authorSchroeder, Torsten
dc.contributor.authorHearty, Christopher
dc.contributor.authorMattison, Tom S.
dc.contributor.authorMcKenna, Janis A.
dc.contributor.authorSo, Rocky Y.
dc.contributor.authorBlinov, Vladimir E.
dc.contributor.authorBuzykaev, Alexey
dc.contributor.authorDruzhinin, Vladimir P.
dc.contributor.authorGolubev, Vladimir B.
dc.contributor.authorKozyrev, Evgeny A.
dc.contributor.authorKravchenko, Evgeniy A.
dc.contributor.authorOnuchin, Alexei P.
dc.contributor.authorSerednyakov, Sergey I.
dc.contributor.authorSkovpen, Yuri I.
dc.contributor.authorSolodov, Evgeni Petrovich
dc.contributor.authorTodyshev, Korneliy Yu.
dc.contributor.authorLankford, Andrew J.
dc.contributor.authorDey, Biplab
dc.contributor.authorGary, J. William
dc.contributor.authorLong, Owen
dc.contributor.authorEisner, Alan M.
dc.contributor.authorLockman, William S.
dc.contributor.authorPanduro-Vazquez, William
dc.contributor.authorChao, Daniel S.
dc.contributor.authorCheng, Chih-Hsiang
dc.contributor.authorEchenard, Bertrand
dc.contributor.authorFlood, Kevin T.
dc.contributor.authorHitlin, David G.
dc.contributor.authorKim, Jae
dc.contributor.authorLee, Myeongjae
dc.contributor.authorMiyashita, Tomonari S.
dc.contributor.authorOngmongkolkul, Piti
dc.contributor.authorPorter, Frank C.
dc.contributor.authorRöhrken, Markus
dc.contributor.authorHuard, Zachary
dc.contributor.authorMeadows, Brian T.
dc.contributor.authorPushpawela, Buddhi G.
dc.contributor.authorSokoloff, Michael D.
dc.contributor.authorSun, Liang
dc.contributor.authorSmith, Jim G.
dc.contributor.authorBABAR, Collaboration
dc.PublishedPhysical Review Letters. 2019, 123:091801 (9), 1-8.
dc.description.abstractAn angular analysis of the decay ¯B→D∗ℓ−¯νℓ, ℓ∈{e,μ}, is reported using the full e+e−collision data set collected by the BABAR experiment at the Υ(4S) resonance. One B meson from the Υ(4S)→B¯B decay is fully reconstructed in a hadronic decay mode, which constrains the kinematics and provides a determination of the neutrino momentum vector. The kinematics of the semileptonic decay is described by the dilepton mass squared, q2, and three angles. The first unbinned fit to the full four-dimensional decay rate in the standard model is performed in the so-called Boyd-Grinstein-Lebed approach, which employs a generic q2 parametrization of the underlying form factors based on crossing symmetry, analyticity, and QCD dispersion relations for the amplitudes. A fit using the more model-dependent Caprini-Lellouch-Neubert (CLN) approach is performed as well. Our form factor shapes show deviations from previous fits based on the CLN parametrization. The latest form factors also provide an updated prediction for the branching fraction ratio R(D∗)≡B(¯B→D∗τ−¯ντ)/B(¯B→D∗ℓ−¯νℓ)=0.253±0.005. Finally, using the well-measured branching fraction for the ¯B→D∗ℓ−¯νℓ decay, a value of |Vcb|=(38.36±0.90)×10−3 is obtained that is consistent with the current world average for exclusive ¯B→D(*)ℓ−¯νℓ decays and remains in tension with the determination from inclusive semileptonic B decays to final states with charm.en_US
dc.publisherAmerican Physical Societyen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleExtraction of form factors from a four-dimensional angular analysis of ¯B→D∗ℓ−¯νℓen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.source.journalPhysical Review Lettersen_US
dc.subject.nsiVDP::Kjerne- og elementærpartikkelfysikk: 431en_US
dc.subject.nsiVDP::Nuclear and elementary particle physics: 431en_US
dc.identifier.citationPhysical Review Letters. 2019, 123 (9), 091801en_US

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