First Measurement of the Ds+ →K0μ+νμ Decay

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First Measurement of the Ds+ →K0μ+νμ Decay. / BESIII Collaboration ; Ачасов, Михаил Николаевич ; Мучной, Николай Юрьевич et al.

In: Physical Review Letters, Vol. 136, No. 16, 161802, 22.04.2026.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{ac194573386848f78bc6117127b46690,

title = "First Measurement of the Ds+ →K0μ+νμ Decay",

abstract = "We report the first measurement of the semileptonic decay 퐷+푠→퐾0⁢휇+⁢휈휇, using a sample of 푒+⁢푒− annihilation 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 at the BEPCII collider. The branching fraction of the decay is measured to be ℬ⁡(퐷+푠→퐾0⁢휇+⁢휈휇)=(2.89±0.2⁢7stat±0.1⁢2syst)×10−3, where the first uncertainty is statistical and the second is systematic. Based on a simultaneous fit to the partial decay rates in 푞2 intervals measured in 퐷+푠→퐾0⁢휇+⁢휈휇 and 퐷+푠 →퐾0⁢푒+⁢휈푒 decays, the product value of the form factor 푓퐾0+⁡(0) and the Cabibbo-Kobayashi-Maskawa matrix element |푉푐⁢푑| is measured to be 푓퐾0+⁡(0)⁢|푉푐⁢푑|=0.140±0.00⁢8stat±0.00⁢3syst, which is the most precise determination to date. In addition, lepton flavor universality is tested for the first time with 퐷+푠→퐾0⁢ℓ+⁢휈ℓ decays in full and separate 푞2 intervals. No violation is found.",

keywords = "Electroweak interaction, Leptonic, semileptonic & radiative decays, Quark mixing, Charm quark, Charmed mesons, Form factors",

author = "{BESIII Collaboration} and Ачасов, {Михаил Николаевич} and Мучной, {Николай Юрьевич} and Николаев, {Иван Борисович}",

note = "We thank Wei Wang for valuable discussions on the correction to the differential decay rate. The BESIII Collaboration thanks the staff of BEPCII [43] and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2023YFA1606000 and No. 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11935015, No. 11935016, No. 11935018, No. 12022510, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, No. 12361141819, and No. 12375090; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174 and No. 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374. This work is also supported by the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China under Contract No. 24XNKJ05.",

year = "2026",

month = apr,

day = "22",

doi = "10.1103/bk2n-lgps",

language = "English",

volume = "136",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "16",

}

RIS

TY - JOUR

T1 - First Measurement of the Ds+ →K0μ+νμ Decay

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - We thank Wei Wang for valuable discussions on the correction to the differential decay rate. The BESIII Collaboration thanks the staff of BEPCII [43] and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2023YFA1606000 and No. 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11935015, No. 11935016, No. 11935018, No. 12022510, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, No. 12361141819, and No. 12375090; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174 and No. 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374. This work is also supported by the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China under Contract No. 24XNKJ05.

PY - 2026/4/22

Y1 - 2026/4/22

N2 - We report the first measurement of the semileptonic decay 퐷+푠→퐾0⁢휇+⁢휈휇, using a sample of 푒+⁢푒− annihilation 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 at the BEPCII collider. The branching fraction of the decay is measured to be ℬ⁡(퐷+푠→퐾0⁢휇+⁢휈휇)=(2.89±0.2⁢7stat±0.1⁢2syst)×10−3, where the first uncertainty is statistical and the second is systematic. Based on a simultaneous fit to the partial decay rates in 푞2 intervals measured in 퐷+푠→퐾0⁢휇+⁢휈휇 and 퐷+푠 →퐾0⁢푒+⁢휈푒 decays, the product value of the form factor 푓퐾0+⁡(0) and the Cabibbo-Kobayashi-Maskawa matrix element |푉푐⁢푑| is measured to be 푓퐾0+⁡(0)⁢|푉푐⁢푑|=0.140±0.00⁢8stat±0.00⁢3syst, which is the most precise determination to date. In addition, lepton flavor universality is tested for the first time with 퐷+푠→퐾0⁢ℓ+⁢휈ℓ decays in full and separate 푞2 intervals. No violation is found.

AB - We report the first measurement of the semileptonic decay 퐷+푠→퐾0⁢휇+⁢휈휇, using a sample of 푒+⁢푒− annihilation 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 at the BEPCII collider. The branching fraction of the decay is measured to be ℬ⁡(퐷+푠→퐾0⁢휇+⁢휈휇)=(2.89±0.2⁢7stat±0.1⁢2syst)×10−3, where the first uncertainty is statistical and the second is systematic. Based on a simultaneous fit to the partial decay rates in 푞2 intervals measured in 퐷+푠→퐾0⁢휇+⁢휈휇 and 퐷+푠 →퐾0⁢푒+⁢휈푒 decays, the product value of the form factor 푓퐾0+⁡(0) and the Cabibbo-Kobayashi-Maskawa matrix element |푉푐⁢푑| is measured to be 푓퐾0+⁡(0)⁢|푉푐⁢푑|=0.140±0.00⁢8stat±0.00⁢3syst, which is the most precise determination to date. In addition, lepton flavor universality is tested for the first time with 퐷+푠→퐾0⁢ℓ+⁢휈ℓ decays in full and separate 푞2 intervals. No violation is found.

KW - Electroweak interaction

KW - Leptonic, semileptonic & radiative decays

KW - Quark mixing

KW - Charm quark

KW - Charmed mesons

KW - Form factors

UR - https://www.scopus.com/pages/publications/105037216306

U2 - 10.1103/bk2n-lgps

DO - 10.1103/bk2n-lgps

M3 - Article

C2 - 42113165

VL - 136

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 16

M1 - 161802

ER -

ID: 83714306