Электронный каталог

Статья

Ablikim, M.
First Experimental Study of the Purely Leptonic Decay D&sup(* +)&sub(s)*>e*+*n&sub(e) / 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.] // Physical Review Letters [Electronic resource]. – 2023. – Vol.131, No.14. – P.141802. – URL: https://doi.org/10.1103/PhysRevLett.131.141802. – Bibliogr.:45.

Using 7.33  fb−1 of e+e− collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay D*+s→e+νe. Our data contain a signal of this decay with a statistical significance of 2.9σ. The branching fraction of D*+s→e+νe is measured to be (2.1+1.2−0.9stat±0.2syst)×10−5, corresponding to an upper limit of 4.0×10−5 at the 90% confidence level. Taking the total width of the D*+s [(0.070±0.028)  keV] predicted with the radiative D*+s decay from the lattice QCD calculation as input, the decay constant of the D*+s is determined to be fD*+s=(214+61−46stat±44syst)  MeV, corresponding to an upper limit of 354 MeV at the 90% confidence level.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки