Электронный каталог

Статья

Ablikim, M.
Studies of the Decay D*+&sub(s)*>K*+K*-*m*+*n&sub(*m) / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, S.Pogodin, A.Sarantsev, A.Zhemchugov, [a.o.] // Journal of High Energy Physics [Electronic resource]. – 2023. – Vol. 2023, No. 12. – P. 072. – URL: https://doi.org/10.1007/JHEP12(2023)072. – Bibliogr.:59.

The D+ s → K+K−μ+νμ decay is studied based on 7.33 fb−1 of e+e− collision data collected with the BESIII detector at center-of-mass energies in the range from 4.128 to 4.226 GeV. The absolute branching fraction is measured as B(D+ s → ϕμ+νμ) = (2.25 ± 0.09 ± 0.07) × 10−2, the most precise measurement to date. Combining with the world average of B(D+ s → ϕe+νe), the ratio of the branching fractions obtained is B(D+ s →ϕμ+νμ) B(D+ s →ϕe+νe) = 0.94 ± 0.08, in agreement with lepton universality. By performing a partial wave analysis, the hadronic form factor ratios at q2 = 0 are extracted, finding rV = V (0) A1(0) = 1.58 ± 0.17 ± 0.02 and r2 = A2(0) A1(0) = 0.71 ± 0.14 ± 0.02, where the first uncertainties are statistical and the second are systematic. No significant S-wave contribution from f0(980) → K+K− is found. The upper limit B(D+ s → f0(980)μ+νμ) · B(f0(980) → K+K−) < 5.45 × 10−4 is set at 90% credibility level.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки
Спец.(статьи,препринты) = С 346.6д1 - Чармоний, боттомоний, топ-кварк. Очарованные частицы и др. резонансы из тяжелых кварков