Speaker
Description
Most of the exotic quarkonium states have been observed in transitions to standard quarkonium states plus light-quark hadrons. However, so far very little is known of these transitions widths in the Born-Oppenheimer picture of exotic quarkonium, that is when exotic quarkonium are considered as heavy-quark-antiquark bound states over the spectrum of static energies for any given set of light degrees of freedom. In this talk we present the computation of the transitions for isospin I=0 exotic quarkonium to standard quarkonium with one or two light-quark mesons in the final state.The computation has two distinct parts: the heavy quark transition matrix elements, which are obtained in a nonrelativistic EFT incorporating the heavy quark, multipole and adiabatic expansions; and the hadronization of the gluonic operators into the light-meson final states. The single mesons production is obtained through the axial anomaly and a standard pi0-eta-eta' mixing scheme. Two pion and kaon production is obtained by solving the coupled Omnès problem.
