Электронный каталог

Статья

Ablikim, M.
Search for the Lepton Flavor Violating Decay J/*q*>e*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.] // Science China Physics, Mechanics, Astronomy [Electronic resource]. – 2023. – Vol. 66, No. 2. – P. 221011. – URL: https://doi.org/10.1007/s11433-022-1995-0. – Bibliogr.:.

We present a search for the lepton flavor violating decay J/ψ → e±μ∓ using 8.998 × 109 J/ψ events collected with the BESIII detector at the BEPCII e+e− storage ring. No excess of signal above background is observed; we therefore set an upper limit on the branching fraction of B(J/ψ → e±μ∓) < 4.5×10−9 at the 90% confidence level. Improving the previous best result by a factor of more than 30, this measurement places the most stringent limit to date on lepton flavor violation in the heavy quarkonium sector.



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