First measurement of the D s + → K * ( 892 ) 0 μ + ν μ decay, study of dynamics and test of lepton universality with D s + → K * ( 892 ) 0 ℓ + ν ℓ decays

We report the first measurement of the semileptonic decay $D^+_s \rightarrow K^*(892)^0μ^+ν_μ$ and an improved measurement of the decay $D^+_s \rightarrow K^*(892)^0 e^+ν_{e}$ using a sample of $7.33~\mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected at center-of-mass energies between 4.128 to 4.226~GeV with the BESIII detector at the BEPCII collider. We measure the branching fractions to be $\mathcal B({D^+_s\rightarrow K^*(892)^0 μ^+ν_μ})=(2.07\pm0.22_{\rm stat}\pm0.10_{\rm syst})\times10^{-3}$ and $\mathcal B({D^+_s\rightarrow K^*(892)^0 e^+ν_{e}})=(2.14\pm0.18_{\rm stat}\pm0.10_{\rm syst})\times10^{-3}$. Based on a simultaneous study of the dynamics in two semileptonic decays, the hadronic form factor parameters in the $D^+_s\rightarrow K^{*}(892)^0$ transition are determined to be $r_{V} = V(0)/A_1(0) = 1.63 \pm 0.14_{\rm stat} \pm 0.08_{\rm syst}$, $r_{2} = A_2(0)/A_1(0) = 0.60 \pm 0.13_{\rm stat} \pm 0.06_{\rm syst}$, and $A_1(0)=0.56 \pm 0.02_{\rm stat} \pm 0.01_{\rm syst}$, where $V(0)$ is the vector form factor and $A_{1,2}(0)$ are the axial-vector form factors evaluated at $q^2=0$. The precision of $r_V$ and $r_2$ is improved by twofold and $A_1(0)$ is measured for the first time. We also report the first model-independent measurements of the differential decay rates and the lepton forward-backward asymmetries for $D^+_s\rightarrow K^{*}(892)^0\ell^+ν_{\ell}$ decays. Based on these measurements, we perform a test of lepton flavor universality in full and separate $q^2$ intervals with $D^+_s\rightarrow K^{*}(892)^0\ell^+ν_{\ell}$ decays. No violation is found within uncertainties. Our results present for the first time a complete study of the dynamics in the $D_s^+\rightarrow K^*(892)^0$ transition, and provide stringent tests of various non-perturbative theoretical calculations.

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Publication Details

Journal
Physical Review Letters
Published
2026-11-04
DOI
https://doi.org/10.1103/flqh-zxzr
Primary Topic
Particle physics theoretical and experimental studies
Type
article
Field-Weighted Citation Impact
0.00

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article

First measurement of the D s + → K * ( 892 ) 0 μ + ν μ decay, study of dynamics and test of lepton universality with D s + → K * ( 892 ) 0 ℓ + ν ℓ decays

W. X. Fang, H. L. Dai, Y. Ding, J. Dong et al.
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Physical Review Letters
Particle physics theoretical and experimental studies
article

First measurement of the D s + → K * ( 892 ) 0 μ + ν μ decay, study of dynamics and test of lepton universality with D s + → K * ( 892 ) 0 ℓ + ν ℓ decays

W. X. Fang, H. L. Dai, Y. Ding, J. Dong, Z. Y. Deng, X. X. Ding, G. R. Che, T. Chen, J. F. Chang, J. P. Dai, Q. An, H. -R. Bao, Y. Z. Che, Jin Fang, C. Q. Deng, H. Cai, A. Dbeyssi, Yingying Ban, Y. H. Fan, G. F. Cao, Y. Y. Duan, J. J. Fan, Y. H. An, Y. Q. Du, Z. K. Chen, S. X. Du, M. L. Chen, M. H. Cai, Y. Q. Chen, M. C. Du, S. M. Chen, Chao Chen, S. S. Fang, M. Y. Dong, X. T. Chen, G. Chen, C. H. Chen, J. Cheng, W. Chen, H. S. Chen, L. Y. Dong, X. L. Du, G. F. Fan, Q. An, G. R. Che, I. Denisenko, V. Batozskaya, M. B. Bertani, J. F. Chang, N. Berger, A. Dbeyssi, R. Aliberti, X. X. Ding, F. Feldbauer, F. Bianchi, C. S. Akondi, E. Bianco, M. Destefanis, X. Y. Chai, M. Berlowski, D. Dedovich, C. Q. Deng, R. A. Briere, J. Cottee-Meldrum, S. K. Choi, M. N. Achasov, M. Ablikim, O. Bakina, G. Cibinetto, F. Cossio, G. F. Fan, I. Boyko, A. Amoroso, H. Cai, A. Bortone, X. C. Ai, P. Adlarson, S. A. Cetin, G. Felici, L. Fava, X. Chu, M. C. Du, H. L. Dai, A. Calcaterra, Y. Ban, P. Egorov, G. F. Cao, F. De Mori, D. Bettoni, A. Brueggemann, K. Begzsuren
article en

Abstract

We report the first measurement of the semileptonic decay $D^+_s \rightarrow K^*(892)^0μ^+ν_μ$ and an improved measurement of the decay $D^+_s \rightarrow K^*(892)^0 e^+ν_{e}$ using a sample of $7.33~\mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected at center-of-mass energies between 4.128 to 4.226~GeV with the BESIII detector at the BEPCII collider. We measure the branching fractions to be $\mathcal B({D^+_s\rightarrow K^*(892)^0 μ^+ν_μ})=(2.07\pm0.22_{\rm stat}\pm0.10_{\rm syst})\times10^{-3}$ and $\mathcal B({D^+_s\rightarrow K^*(892)^0 e^+ν_{e}})=(2.14\pm0.18_{\rm stat}\pm0.10_{\rm syst})\times10^{-3}$. Based on a simultaneous study of the dynamics in two semileptonic decays, the hadronic form factor parameters in the $D^+_s\rightarrow K^{*}(892)^0$ transition are determined to be $r_{V} = V(0)/A_1(0) = 1.63 \pm 0.14_{\rm stat} \pm 0.08_{\rm syst}$, $r_{2} = A_2(0)/A_1(0) = 0.60 \pm 0.13_{\rm stat} \pm 0.06_{\rm syst}$, and $A_1(0)=0.56 \pm 0.02_{\rm stat} \pm 0.01_{\rm syst}$, where $V(0)$ is the vector form factor and $A_{1,2}(0)$ are the axial-vector form factors evaluated at $q^2=0$. The precision of $r_V$ and $r_2$ is improved by twofold and $A_1(0)$ is measured for the first time. We also report the first model-independent measurements of the differential decay rates and the lepton forward-backward asymmetries for $D^+_s\rightarrow K^{*}(892)^0\ell^+ν_{\ell}$ decays. Based on these measurements, we perform a test of lepton flavor universality in full and separate $q^2$ intervals with $D^+_s\rightarrow K^{*}(892)^0\ell^+ν_{\ell}$ decays. No violation is found within uncertainties. Our results present for the first time a complete study of the dynamics in the $D_s^+\rightarrow K^*(892)^0$ transition, and provide stringent tests of various non-perturbative theoretical calculations.

Physical Review Letters
U.S. Department of Energy, Strong, National Research Foundation, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Chinese Academy of Sciences, National Research Foundation of Korea, Knut och Alice Wallenbergs Stiftelse, Renmin University of China, Vetenskapsrådet, Istituto Nazionale di Fisica Nucleare, Shanghai Key Laboratory for Particle Physics and Cosmology, Science and Technology Facilities Council, Institute of High Energy Physics, Fundamental Research Funds for the Central Universities, H2020 European Research Council
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Particle physics theoretical and experimental studies
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