Eur. Phys. J. C 22, 707-713 (2002)
https://doi.org/10.1007/s100520100847

Couplings between pion and charmed mesons

Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea

Received: 10 October 2001
Revised: 25 October 2001
Published online: 7 December 2001

Abstract

We compute the couplings DD^*π, D₁D^*π, D^*D^*π and D₁ D₁π 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 p_μ, 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 g_DD^*π = 8.2 ± 0.1, g_D1D^*π = 15.8 ± 2 GeV, g_D^*D^*π= 0.3 ± 0.03 and g_D1D1π= 0.17 ± 0.04.