We compute the couplings DD*π, D1D*π, D*D*π and D1D1π using QCD sum rules. These couplings are important inputs in the meson-exchange model calculations used to estimate the amount of J/ψ absorption due to pions and rho mesons in heavy-ion collisions. Our sum rules are constructed at the first order in the pion momentum pμ, which give the couplings that are not trivially related to the soft-pion theorem. Our calculated couplings, which somewhat depend upon the values of the heavy meson decay constants, are gDD*π = 8.2 ± 0.1, gDD*π = 15.8 ± 2GeV, gD*D*π = 0.3 ± 0.03 and gD1D1π = 0.17 ± 0.04.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics