Электронный каталог

Статья

Ablikim, M.
Precision Measurement of the Matrix Elements for *h*>*p*+*p*-*p*0 and *h*>*p*0*p*0*p*0 Decays / 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.9. – P.092007. – URL: https://doi.org/10.1103/PhysRevD.107.092007. – Bibliogr.:54.

A precision measurement of the matrix elements for η→π+π−π0 and η→π0π0π0 decays is performed using a sample of (10087±44)×106  J/ψ decays collected with the BESIII detector. The decay J/ψ→γη is used to select clean samples of 631,686  η→π+π−π0 decays and 272,322  η→π0π0π0 decays. The matrix elements for both channels are in reasonable agreement with previous measurements. The nonzero gX2Y term for the decay mode η→π+π−π0 is confirmed, as reported by the KLOE Collaboration, while the other higher-order terms are found to be insignificant. Dalitz plot asymmetries in the η→π+π−π0 decay are also explored and are found to be consistent with charge conjugation invariance. In addition, a cusp effect is investigated in the η→π0π0π0 decay, and no obvious structure around the π+π− mass threshold is observed.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки
Бюллетени = 44/023