Study of the D0 →k-μ+νμ Dynamics and Test of Lepton Flavor Universality with D0 →k- +ν Decays

(BESIII Collaboration)

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Using e+e- annihilation data of 2.93 fb-1 collected at center-of-mass energy s=3.773 GeV with the BESIII detector, we measure the absolute branching fraction of D0→K-μ+νμ with significantly improved precision: BD0→K-μ+νμ=(3.413±0.019stat±0.035syst)%. Combining with our previous measurement of BD0→K-e+νe, the ratio of the two branching fractions is determined to be BD0→K-μ+νμ/BD0→K-e+νe=0.974±0.007stat±0.012syst, 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-momentum transfer 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±0.0039stat±0.0030syst and |Vcs|=0.955±0.005stat±0.004syst±0.024LQCD.

Original languageEnglish (US)
Article number011804
JournalPhysical Review Letters
Volume122
Issue number1
DOIs
StatePublished - Jan 10 2019

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leptons
decay
momentum transfer
center of mass
quantum chromodynamics
statistics
detectors
energy

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Study of the D0 →k-μ+νμ Dynamics and Test of Lepton Flavor Universality with D0 →k- +ν Decays. / (BESIII Collaboration).

In: Physical Review Letters, Vol. 122, No. 1, 011804, 10.01.2019.

Research output: Contribution to journalArticle

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title = "Study of the D0 →k-μ+νμ Dynamics and Test of Lepton Flavor Universality with D0 →k- +ν Decays",
abstract = "Using e+e- annihilation data of 2.93 fb-1 collected at center-of-mass energy s=3.773 GeV with the BESIII detector, we measure the absolute branching fraction of D0→K-μ+νμ with significantly improved precision: BD0→K-μ+νμ=(3.413±0.019stat±0.035syst){\%}. Combining with our previous measurement of BD0→K-e+νe, the ratio of the two branching fractions is determined to be BD0→K-μ+νμ/BD0→K-e+νe=0.974±0.007stat±0.012syst, 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-momentum transfer 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±0.0039stat±0.0030syst and |Vcs|=0.955±0.005stat±0.004syst±0.024LQCD.",
author = "{(BESIII Collaboration)} and M. Ablikim and Achasov, {M. N.} and S. Ahmed and M. Albrecht and M. Alekseev and A. Amoroso and An, {F. F.} and Q. An and Bai, {J. Z.} and Y. Bai and O. Bakina and {Baldini Ferroli}, R. and Y. Ban and K. Begzsuren and Bennett, {D. W.} and Bennett, {J. V.} and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and E. Boger and I. Boyko and Briere, {R. A.} and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, {G. F.} and Cetin, {S. A.} and J. Chai and Chang, {J. F.} and G. Chelkov and G. Chen and Chen, {H. S.} and Chen, {J. C.} and Chen, {M. L.} and Chen, {P. L.} and Chen, {S. J.} and Chen, {X. R.} and Chen, {Y. B.} and W. Cheng and Chu, {X. K.} and G. Cibinetto and F. Cossio and Dai, {H. L.} and Dai, {J. P.} and A. Dbeyssi and D. Dedovich and Deng, {Z. Y.} and Hajime Muramatsu",
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AU - Ahmed, S.

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AU - Alekseev, M.

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AU - An, F. F.

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AU - Bettoni, D.

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AU - Cetin, S. A.

AU - Chai, J.

AU - Chang, J. F.

AU - Chelkov, G.

AU - Chen, G.

AU - Chen, H. S.

AU - Chen, J. C.

AU - Chen, M. L.

AU - Chen, P. L.

AU - Chen, S. J.

AU - Chen, X. R.

AU - Chen, Y. B.

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AU - Chu, X. K.

AU - Cibinetto, G.

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AU - Dai, H. L.

AU - Dai, J. P.

AU - Dbeyssi, A.

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N2 - Using e+e- annihilation data of 2.93 fb-1 collected at center-of-mass energy s=3.773 GeV with the BESIII detector, we measure the absolute branching fraction of D0→K-μ+νμ with significantly improved precision: BD0→K-μ+νμ=(3.413±0.019stat±0.035syst)%. Combining with our previous measurement of BD0→K-e+νe, the ratio of the two branching fractions is determined to be BD0→K-μ+νμ/BD0→K-e+νe=0.974±0.007stat±0.012syst, 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-momentum transfer 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±0.0039stat±0.0030syst and |Vcs|=0.955±0.005stat±0.004syst±0.024LQCD.

AB - Using e+e- annihilation data of 2.93 fb-1 collected at center-of-mass energy s=3.773 GeV with the BESIII detector, we measure the absolute branching fraction of D0→K-μ+νμ with significantly improved precision: BD0→K-μ+νμ=(3.413±0.019stat±0.035syst)%. Combining with our previous measurement of BD0→K-e+νe, the ratio of the two branching fractions is determined to be BD0→K-μ+νμ/BD0→K-e+νe=0.974±0.007stat±0.012syst, 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-momentum transfer 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±0.0039stat±0.0030syst and |Vcs|=0.955±0.005stat±0.004syst±0.024LQCD.

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