First Measurement of the Form Factors in D s + → K 0 e + ν e and D s + → K * 0 e + ν e Decays

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Begzsuren, K.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chang, W. L.; 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.; Cheng, W.; Chu, X. K.; Cibinetto, G.; Cossio, F.; 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. 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doi:10.1103/PhysRevLett.122.061801

Title: First Measurement of the Form Factors in $D_{s}^{+} \to K^{0} e^{+} ν_{e}$ and $D_{s}^{+} \to K^{* 0} e^{+} ν_{e}$ Decays

Journal Article · Fri Feb 15 00:00:00 EST 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.061801· OSTI ID:1494857

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

We address new measurements of Cabibbo-suppressed semileptonic D$$+\atop{s}$$ decays using 3.19 fb^-1 of e⁺e^- annihilation data sample collected at a center-of-mass energy of 4.178 GeV with the BESIII detector at the BEPCII collider. Our results include branching fractions $$\mathcal{B(D^+_s→K^0e^+v_e)}$$ = (3.25 ± 0.38(stat.) ± 0.16(syst.))×10^-3 and $$\mathcal{B(D^+_s→K*^0e^+v_e)}$$ = (2.37±0.26(stat.)±0.20(syst.))×10^-3 which are much improved relative to previous measurements, and the first measurements of the hadronic form-factor parameters for these decays. For D$$+\atop{s}$$→K⁰e⁺v_e, we obtain f₊(0) = 0.720 ± 0.084(stat.) ± 0.013(syst.), and for D$$+\atop{s}$$→K*⁰e⁺v_e, we find form-factor ratios r_V = V (0)/A₁(0) = 1.67 ± 0.34(stat.) ± 0.16(syst.) and r₂ = A₂(0)/A₁(0) = 0.77 ± 0.28(stat.) ± 0.07(syst.).

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Research Organization:: George Washington Univ. Virginia Science and Technology Campus, Ashburn, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC-0010118; SC-0010504; SC-0012069; SC0016583

OSTI ID:: 1494857

Alternate ID(s):: OSTI ID: 1504150

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 122 Journal Issue: 6; ISSN 0031-9007

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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