English

Meson spectroscopy: too much excitement and too few excitations

High Energy Physics - Phenomenology 2012-11-06 v1 High Energy Physics - Experiment

Abstract

We briefly review the general status of meson spectroscopy, especially in light of the often made claim that there are too many observed resonances to be accounted for as qqˉq\bar{q} states. Also, the adequacy of the usual Coulomb-plus-linear, alias "funnel", confining potential for reproducing the experimental spectra of light, heavy-light, and heavy mesons is critically analysed. Thus, many serious discrepancies are observed and discussed. As possible causes, we suggest the neglect of unitarisation and other coupled-channel effects, as well as the deficiency of the funnel potential itself. In order to illustrate our alternative, "unquenched" approach, we present some recent examples of successfully described puzzling mesonic enhancements and resonances, such as the charmonium states X(4260) and X(3872), as well as the axial-vector charmed mesons D1(2420)D_1(2420), D1(2430)D_1(2430), Ds1(2536)D_{s1}(2536), and Ds1(2460)D_{s1}(2460).

Keywords

Cite

@article{arxiv.1209.1475,
  title  = {Meson spectroscopy: too much excitement and too few excitations},
  author = {George Rupp and Susana Coito and Eef van Beveren},
  journal= {arXiv preprint arXiv:1209.1475},
  year   = {2012}
}

Comments

Contribution to the International Meeting "Excited QCD", Peniche, Portugal, 06 - 12 May 2012; 8 pages, 3 figures (5 plots), Acta Physica Polonica style