P-wave spin-spin splitting and meson loops
Abstract
In quark potential models the hyperfine splitting of P-wave mesons is zero in the nonrelativistic limit, a prediction strikingly confirmed by experiment in both charmonia and bottomonia. The result, however, ignores the coupling of bare quarkonia to meson-meson pairs. This coupling causes mass shifts among the states and so could potentially spoil the quark model prediction. This turns out not to be the case: in a variety of models the hyperfine splitting remains small despite large mass shifts. This is shown to be a generic feature of models in which the coupling involves the creation of a light quark pair with spin-one and the quark spin wavefunctions are conserved. This talk reports on the results of Phys. Rev. D84, 034021 (2011).
Keywords
Cite
@article{arxiv.1108.5259,
title = {P-wave spin-spin splitting and meson loops},
author = {T. J. Burns},
journal= {arXiv preprint arXiv:1108.5259},
year = {2011}
}
Comments
4 pages, typo corrected. Contribution to the Proceedings of the XIV International Conference on Hadron Spectroscopy (Hadron 2011), 13-17 June 2011, Munich, Germany