Extended van Royen-Weisskopf formalism for lepton-antilepton meson decay widths within non-relativistic quark models
Nuclear Theory
2009-11-07 v1
Abstract
The classical van Royen-Weisskopf formula for the decay width of a meson into a lepton-antilepton pair is modified in order to include non-zero quark momentum contributions within the meson as well as relativistic effects. Besides, a phenomenological electromagnetic density for quarks is introduced. The meson wave functions are obtained from two different models: a chiral constituent quark model and a quark potential model including instanton effects. The modified van Royen-Weisskopf formula is found to improve systematically the results for the widths, giving an overall good description of all known decays.
Keywords
Cite
@article{arxiv.nucl-th/0109080,
title = {Extended van Royen-Weisskopf formalism for lepton-antilepton meson decay widths within non-relativistic quark models},
author = {L. A. Blanco and R. Bonnaz and B. Silvestre-Brac and F. Fernandez and A. Valcarce},
journal= {arXiv preprint arXiv:nucl-th/0109080},
year = {2009}
}
Comments
22 pages, 3 figures, RevTex, epsfig. To be published in Nucl. Phys. A