We know that the \eta_c is the ground state of charmonium, and it has hundreds of hardronic decay modes. Once the Belle and Babar have measured the cross section of J/\psi + \eta_c (Phys. Rev. Lett. 89, 142001 (2002), hep-ex/0412041, Phys. Rev. D 72, 031101 (2005)), and the \eta_c is identified with the electric tracks, could you please give an explanation for it?
Jun Jiang
Usually, experimental physicists use the following 16 decay channels to reconstruct the ηc meson.
ηc→Xi,
Xi={pp-bar, π+π-K+K-, π+π-pp-bar, 2(K+K-), 2(π+π-), 3(π+π-), 2(π+π-)K+K-, KS0K+π- +c.c., KS0K+π-π+π-+c.c., K+K-π0, pp-barπ0, K+K-η, π+π-η, π+π-π0π0, 2(π+π-)η, 2(π+π-π0) }.
More infomation can be found in the attachment(P.9,P.21.).
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