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Study of the D-0 -> K-mu(+)nu(mu) Dynamics and Test of Lepton Flavor Universality with D-0 -> K(-)l(+)nu(l) Decays
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0002-6945-716x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0003-4937-2270
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Number of Authors: 4612019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 1, article id 011804Article in journal (Refereed) Published
Abstract [en]

Using e(+)e(-) annihilation data of 2.93 fb(-1) collected at center-of-mass energy root s = 3.773 GeV with the BESIII detector, we measure the absolute branching fraction of D-0 -> K-mu(+)nu(mu) with significantly improved precision: BD0 -> K-mu+nu mu = (3.413 +/- 0.019(stat) +/- 0.035(syst))%. Combining with our previous measurement of BD0 -> K-e+nu e, the ratio of the two branching fractions is determined to be BD0 -> K-mu+nu mu/BD0 -> K-e+nu e = 0.974 +/- 0.007(stat) +/- 0.012(syst), which agrees with the theoretical expectation of lepton flavor universality within the uncertainty. A study of the ratio of the two branching fractions in different four-momentumtransfer regions is also performed, and no evidence for lepton flavor universality violation is found with current statistics. Taking inputs from global fit in the standard model and lattice quantum chromodynamics separately, we determine f(+)(K)(0) = 0.7327 +/- 0.0039(stat) +/- 0.0030(syst) and vertical bar V-cs vertical bar = 0.955 +/- 0.005(stat) +/- 0.004(syst) +/- 0.024(LQCD).

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 122, no 1, article id 011804
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-376884DOI: 10.1103/PhysRevLett.122.011804ISI: 000455687000010OAI: oai:DiVA.org:uu-376884DiVA, id: diva2:1288404
Funder
Swedish Research CouncilGerman Research Foundation (DFG), CRC 1044German Research Foundation (DFG), FOR 2359
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.122.011804

Available from: 2019-02-13 Created: 2019-02-13 Last updated: 2019-02-13Bibliographically approved

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