Unquenching the quark model in a non-perturbative scheme
Abstract
In recent years, the discovery in quarkonium spectrum of several states not predicted by the naive quark model has awakened a lot of interest. A possible description of such states requires the enlargement of the quark model by introducing quark-antiquark pair creation or continuum coupling effects. The unquenching of the quark models is a way to take these new components into account. In the spirit of the Cornell Model, this is usually done by coupling perturbatively a quark-antiquark state with definite quantum numbers to the meson-meson channel with closest threshold. In this work we present a method to coupled quark-antiquark states with meson-meson channels, taking into account effectively the non-perturbative coupling to all quark-antiquark states with the same quantum numbers. The method will be applied to the study of the X(3872) resonance and a comparison with the perturbative calculation will be performed.
Keywords
Cite
@article{arxiv.1901.02484,
title = {Unquenching the quark model in a non-perturbative scheme},
author = {Pablo G. Ortega and David R. Entem and Francisco Fernández},
journal= {arXiv preprint arXiv:1901.02484},
year = {2019}
}
Comments
6 pages