Электронный каталог

Статья

Ablikim, M.
Observation of e*+e*-*>ppp^-n^-*p*- + c.c. / 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.] // Chinese Physics C [Electronic resource]. – 2023. – Vol.47, No.4. – P.043001. – URL: https://doi.org/10.1088/1674-1137/acb6eb. – Bibliogr.:37.

Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESIII detector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 $ rm fb^{-1} $, the process $ e^+e^- to p p bar{p} bar{n} pi^{-} + c.c. $ is observed for the first time with a statistical significance of $ 11.5sigma $. The average Born cross sections in the energy ranges of (4.160, 4.380) GeV, (4.400, 4.600) GeV and (4.610, 4.700) GeV are measured to be $ (21.5pm5.7pm1.2) $ fb, $ (46.3pm10.6pm2.5) $ fb and $ (59.0pm9.4pm3.2) $ fb, respectively, where the first uncertainties are statistical and the second are systematic. The line shapes of the $ bar{p}bar{n} $ and $ pppi^- $ invariant mass spectra are consistent with phase space distributions, indicating that no hexaquark or di-baryon state is observed.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки
Бюллетени = 1/023