Электронный каталог

Статья

Ablikim, M.
Measurement of e*+e*-*>*L*L^-*h from 3.5106 to 4.6988 GeV and Study of *L*L^- Mass Threshold Enhancement / 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 D [Electronic resource]. – 2023. – Vol.107, No.11. – P.112001. – URL: https://doi.org/10.1103/PhysRevD.107.112001. – Bibliogr.:83.

Using data samples with a total integrated luminosity of approximately 18  fb−1 collected by the BESIII detector operating at the Beijing Electron-Positron Collider II, the process e+e−→Λ¯Λη is studied at center-of-mass energies between 3.5106 and 4.6988 GeV. The Born cross section for the process e+e−→Λ¯Λη is measured. No significant structure is observed in the Born cross section line shape. An enhancement near the Λ¯Λ mass threshold is observed for the first time in the process. The structure can be described by an S-wave Breit-Wigner function. Neglecting contribution of excited Λ states and potential interferences, the mass and width are determined to be (2356±7±15)  MeV/c2 and (304±28±54)  MeV, respectively, where the first uncertainties are statistical and the second are systematic. Figure Figure Figure Figure Figure Figure Figure



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