Observation of e + e - → γχ c1 and search for e + e - → γχ c0 , γχ c2 , and γη c at √s near 10.6 GeV at Belle
Journal
Physical Review D
Journal Volume
98
Journal Issue
9
Date Issued
2018
Author(s)
Jia S. et al.
Wang, X.L.
Shen, C.P.
Yuan, C.Z.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D.M.
Atmacan, H.
Aulchenko, V.
Aushev, T.
Abstract
Using data samples of 89.5 fb-1, 711.0 fb-1, and 121.4 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at center-of-mass energies 10.52, 10.58, and 10.867 GeV, respectively, we study the exclusive reactions e+e-→γχcJ (J=0, 1, 2) and e+e-→γηc. A significant γχc1 signal is observed for the first time at s=10.58 GeV with a significance of 5.1σ including systematic uncertainties. No significant excesses for γχc0, γχc2, and γηc final states are found, and we set 90% credibility level upper limits on the Born cross sections (σB) at 10.52 GeV, 10.58 GeV, and 10.867 GeV. Together with cross sections measured by BESIII at lower center-of-mass energies, the energy dependency of σB(e+e-→γχc1) is obtained. ? 2018 authors. Published by the American Physical Society.
SDGs
Type
journal article