By extracting the transition amplitudes, we give the first lattice QCD prediction of the two-body decay partial widths of the 1−+ charmoniumlike hybrid ηc1. Given the calculated mass value mηc1=4.329(36) GeV, the ηc1 decay is dominated by the open charm modes D1D¯, D*D,¯ and D*D¯* with partial widths of 258(133), 88(18), and 150(118) MeV, respectively. The coupling of ηc1 to χc1 plus a flavor singlet pseudoscalar is not small, but χc1η decay is suppressed by the small η−η′ mixing angle. The partial width of ηc1→ηcη′ is estimated to be around 1 MeV. We suggest experiments to search for ηc1 in the P-wave D*D¯ and D*D¯* systems. Especially, the polarization of D*D¯* can be used to distinguish the 1−+ product (total spin S=1) from 1−− products (S=0).
Published by the American Physical Society
2024