Improved measurement of the semileptonic decay D s + → K 0 e + ν e

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Che, G. R.; Chelkov, G.; Chen, C.; Chen, C. H.; Chen, Chao; Chen, G.; Chen, H. S.; Chen, H. Y.; Chen, M. L.; Chen, S. J.; Chen, S. L.; Chen, S. M.; Chen, T.; Chen, X. R.; Chen, X. T.; Chen, Y. B.; Chen, Y. Q.; Chen, Z. J.; Chen, Z. Y.; Choi, S. K.; Cibinetto, G.; Cossio, F.; Cui, J. J.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, C. Q.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, B.; Ding, X. X.; Ding, Y.; Ding, Y.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, M. C.; Du, S. X.; Duan, Y. Y.; Duan, Z. 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doi:10.1103/PhysRevD.110.052012

Improved measurement of the semileptonic decay $D_{s}^{+} \to K^{0} e^{+} ν_{e}$

Journal Article · Mon Sep 30 00:00:00 EDT 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.110.052012· OSTI ID:2449622

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

Analyzing $e^{+} e^{-}$ collision data corresponding to an integrated luminosity of $7.33 {fb}^{- 1}$ collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we measure the branching fraction of the semileptonic decay $D_{s}^{+} \to K^{0} e^{+} ν_{e}$ to be $(2.98 \pm 0.2 3_{stat} \pm 0.1 2_{syst}) \times 10^{- 3}$ . Based on fit to the partial decay rates in various $q^{2}$ intervals, the product value of $D_{s}^{+} \to K^{0}$ hadronic form factor and Cabibbo-Kobayashi-Maskawa element is measured to be $f_{+}^{K^{0}} (0) | V_{c d} | = 0.143 \pm 0.01 1_{stat} \pm 0.00 3_{syst}$ . With $| V_{c d} | = 0.22486 \pm 0.00067$ as an input, the hadronic form factor is evaluated to be $f_{+}^{K^{0}} (0) = 0.636 \pm 0.04 9_{stat} \pm 0.01 3_{syst}$ . The branching fraction and form factor measurements are factors of 1.6 and 1.7 more precise than the previous world averages, respectively.

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2449622

Alternate ID(s):: OSTI ID: 2579551

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 5 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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