Электронный каталог

Статья

Ablikim, M.
Measurement of the Cross Sections for e*+e*- *> *h*p*+*p*- at Center-of-Mass Energies Between 2.00 and 3.08 GeV / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, A.Sarantsev, A.Zhemchugov, [a.o.] // Physical Review D [Electronic resource]. – 2023. – Vol.108, No.11. – P. L111101. – URL: https://doi.org/10.1103/PhysRevD.108.L111101. – Bibliogr.: 49.

Using data samples collected at center-of-mass energies between 2.000 and 3.080 GeV with the BESIII detector operating at the BEPCII collider, a partial-wave analysis is performed on the process e+e−→ηπ+π−. In addition to the dominant e+e−→ρη component, the e+e−→a2(1320)π process is also sizable, contributing up to 24% of the total reaction. The measured cross sections of the process e+e−→ηπ+π− are systematically higher than those of BABAR by more than 3σ at center-of-mass energies between 2.000 and 2.300 GeV. In the cross section line shape for e+e−→a2(1320)π, a resonant structure is observed with a significance of 5.5σ, with M=(2044±31±4)  MeV/c2, Γ=(163±69±24)  MeV, and BR⋅ΓRe+e−=(34.6±17.1±6.0)  eV or (137.1±73.3±2.1)  eV. In the cross section line shape for e+e−→ρη, an evidence of a dip structure around 2180  MeV/c2 is observed with statistical significance of 3.0σ.



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