Based on 10.64  fb−1 of 𝑒+⁢𝑒− collision data taken at center-of-mass energies between 4.237 and 4.699 GeV with the BESIII detector, we study the leptonic 𝐷+𝑠 decays using the 𝑒+⁢𝑒−→𝐷*+𝑠⁢𝐷*−𝑠 process. The branching fractions of 𝐷+𝑠→ℓ+⁢𝜈ℓ⁡(ℓ=𝜇,𝜏) are measured to be ℬ(𝐷+𝑠→𝜇+⁢𝜈𝜇) = (0.547±0.02⁢6stat±0.01⁢6syst)% and ℬ(𝐷+𝑠→𝜏+⁢𝜈𝜏) = (5.60±0.1⁢6stat±0.2⁢0syst)%, respectively. The product of the decay constant and Cabibbo-Kobayashi-Maskawa matrix element |𝑉𝑐⁢𝑠| is determined to be 𝑓𝐷+𝑠⁢|𝑉𝑐⁢𝑠| = (246.5±5.9stat±3.6syst±0.5input)_𝜇⁢𝜈 and 𝑓𝐷+𝑠⁢|𝑉𝑐⁢𝑠| = (252.7±3.6stat±4.5syst±0.6input)_𝜏⁢𝜈  MeV, respectively. Taking the value of |𝑉𝑐⁢𝑠| from a global fit in the Standard Model, we obtain 𝑓𝐷+𝑠 = (253.2±6.0stat±3.7syst±0.6input)_𝜇⁢𝜈 and 𝑓𝐷+𝑠 = (259.6±3.7stat±4.6syst±0.6input)_𝜏⁢𝜈  MeV, respectively. Conversely, taking the value for 𝑓𝐷+𝑠 from the latest lattice quantum chromodynamics calculation, we obtain |𝑉𝑐⁢𝑠| = (0.986±0.02⁢3stat±0.01⁢4syst±0.00⁢3input)_𝜇⁢𝜈 and |𝑉𝑐⁢𝑠| = (1.011±0.01⁢4stat±0.01⁢8syst±0.00⁢3input)_𝜏⁢𝜈, respectively.

Measurement of the branching fraction of Ds+ →ℓ+νℓ via e+e- → Ds∗+ Ds∗

Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01

Abstract

Based on 10.64  fb−1 of 𝑒+⁢𝑒− collision data taken at center-of-mass energies between 4.237 and 4.699 GeV with the BESIII detector, we study the leptonic 𝐷+𝑠 decays using the 𝑒+⁢𝑒−→𝐷*+𝑠⁢𝐷*−𝑠 process. The branching fractions of 𝐷+𝑠→ℓ+⁢𝜈ℓ⁡(ℓ=𝜇,𝜏) are measured to be ℬ(𝐷+𝑠→𝜇+⁢𝜈𝜇) = (0.547±0.02⁢6stat±0.01⁢6syst)% and ℬ(𝐷+𝑠→𝜏+⁢𝜈𝜏) = (5.60±0.1⁢6stat±0.2⁢0syst)%, respectively. The product of the decay constant and Cabibbo-Kobayashi-Maskawa matrix element |𝑉𝑐⁢𝑠| is determined to be 𝑓𝐷+𝑠⁢|𝑉𝑐⁢𝑠| = (246.5±5.9stat±3.6syst±0.5input)_𝜇⁢𝜈 and 𝑓𝐷+𝑠⁢|𝑉𝑐⁢𝑠| = (252.7±3.6stat±4.5syst±0.6input)_𝜏⁢𝜈  MeV, respectively. Taking the value of |𝑉𝑐⁢𝑠| from a global fit in the Standard Model, we obtain 𝑓𝐷+𝑠 = (253.2±6.0stat±3.7syst±0.6input)_𝜇⁢𝜈 and 𝑓𝐷+𝑠 = (259.6±3.7stat±4.6syst±0.6input)_𝜏⁢𝜈  MeV, respectively. Conversely, taking the value for 𝑓𝐷+𝑠 from the latest lattice quantum chromodynamics calculation, we obtain |𝑉𝑐⁢𝑠| = (0.986±0.02⁢3stat±0.01⁢4syst±0.00⁢3input)_𝜇⁢𝜈 and |𝑉𝑐⁢𝑠| = (1.011±0.01⁢4stat±0.01⁢8syst±0.00⁢3input)_𝜏⁢𝜈, respectively.
2024
110
5
052002-1
052002-28
charm, Ds, strange quark
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.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2027918
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