Measurement of the Branching Fraction For the Semileptonic Decay D 0 ( + ) → π - ( 0 ) μ + ν μ and Test of Lepton Flavor Universality

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, P. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chu, X. K.; Cibinetto, G.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dou, Z. L.; Du, S. X.; Duan, P. F.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Fegan, S.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. L.; Gao, Y.; Gao, Y. G.; Gao, Z.; Garzia, I.; Goetzen, K.; Gong, L.; Gong, W. 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doi:10.1103/PhysRevLett.121.171803

Title: Measurement of the Branching Fraction For the Semileptonic Decay $D^{0 (+)} \to π^{- (0)} μ^{+} ν_{μ}$ and Test of Lepton Flavor Universality

Journal Article · Fri Oct 26 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.171803· OSTI ID:1479171

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E. more »

Using a data sample corresponding to an integrated luminosity of $$2.93\text{ }\text{ }{\mathrm{fb}}^{{-}1}$$ taken at a center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we perform an analysis of the semileptonic decays $${D}^{0(+)}{\rightarrow}{{\pi}}^{{-}(0)}{{\mu}}^{+}{{\nu}}_{{\mu}}$$. The branching fractions of $${D}^{0}{\rightarrow}{{\pi}}^{{-}}{{\mu}}^{+}{{\nu}}_{{\mu}}$$ and $${D}^{+}{\rightarrow}{{\pi}}^{0}{{\mu}}^{+}{{\nu}}_{{\mu}}$$ are measured to be $$(0.272\pm{}0.00{8}_{\mathrm{stat}}\pm{}0.00{6}_{\mathrm{syst}})%$$ and $$(0.350\pm{}0.01{1}_{\mathrm{stat}}\pm{}0.01{0}_{\mathrm{syst}})%$$, respectively, where the former is of much improved precision compared to previous results and the latter is determined for the first time. Using these results along with previous BESIII measurements of $${D}^{0(+)}{\rightarrow}{{\pi}}^{{-}(0)}{e}^{+}{{\nu}}_{e}$$, we calculate the branching fraction ratios to be $${\mathcal{R}}^{0}{\equiv}{\mathcal{B}}_{{D}^{0}{\rightarrow}{{\pi}}^{{-}}{{\mu}}^{+}{{\nu}}_{{\mu}}}/{\mathcal{B}}_{{D}^{0}{\rightarrow}{{\pi}}^{{-}}{e}^{+}{{\nu}}_{e}}=0.922\pm{}0.03{0}_{\mathrm{stat}}\pm{}0.02{2}_{\mathrm{syst}}$$ and $${\mathcal{R}}^{+}{\equiv}{\mathcal{B}}_{{D}^{+}{\rightarrow}{{\pi}}^{0}{{\mu}}^{+}{{\nu}}_{{\mu}}}/{\mathcal{B}}_{{D}^{+}{\rightarrow}{{\pi}}^{0}{e}^{+}{{\nu}}_{e}}=0.964\pm{}0.03{7}_{\mathrm{stat}}\pm{}0.02{6}_{\mathrm{syst}}$$, which are compatible with the theoretical expectation of lepton flavor universality within $$1.7{\sigma}$$ and $$0.5{\sigma}$$, respectively. We also examine the branching fraction ratios in different four-momentum transfer square regions, and find no significant deviations from the standard model predictions.

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Research Organization:: Indiana Univ., Bloomington, IN (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Hawaii, Honolulu, HI (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC0010118; SC0010504; SC0012069

OSTI ID:: 1479171

Alternate ID(s):: OSTI ID: 1504140

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 121 Journal Issue: 17; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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via

D_{s}^{+} \to μ^{+} ν_{μ}

Journal Article · Fri Feb 22 00:00:00 EST 2019 · Physical Review Letters · OSTI ID:1479171

Ablikim, M.; Achasov, M. N.; Ahmed, S.; +452 more

Measurement of the Dynamics of the Decays

D_{s}^{+} \to η^{(')} e^{+} ν_{e}

Journal Article · Mon Mar 25 00:00:00 EDT 2019 · Physical Review Letters · OSTI ID:1479171

Ablikim, M.; Achasov, M. N.; Ahmed, S.; +460 more

Observation of

D^{0 (+)} \to K_{S}^{0} π^{0 (+)} η^{'}

and improved measurement of

D^{0} \to K^{-} π^{+} η^{'}

Journal Article · Wed Nov 14 00:00:00 EST 2018 · Physical Review. D. · OSTI ID:1479171

Ablikim, M.; Achasov, M. N.; Ahmed, S.; +461 more

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
branching fraction
leptonic
semileptonic & radiative decays
charmed mesons
flavor symmetries
lepton colliders

Title: Measurement of the Branching Fraction For the Semileptonic Decay D 0 ( + ) → π - ( 0 ) μ + ν μ and Test of Lepton Flavor Universality

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Title: Measurement of the Branching Fraction For the Semileptonic Decay $D^{0 (+)} \to π^{- (0)} μ^{+} ν_{μ}$ and Test of Lepton Flavor Universality