Relativistic treatment of the decay constants of light and heavy mesons

Details Relativistic treatment of the decay constants of light and heavy mesons Relativistic treatment of the decay constants of light and heavy mesons

2006-02-13

arxiv.org/abs/hep-ph/0602110v2

Phys.Lett. B635 (2006) 93-99

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 1 figure, minor changes, version published in Phys.Lett.B

Scientific paper

10.1016/j.physletb.2006.02.042

Novel relativistic expressions are used to calculate the weak decay constants of pseudoscalar and vector mesons within the constituent quark model. Meson wave functions satisfy the quasipotential equation with the complete relativistic potential. New contributions, coming from the negative-energy quark states, are substantial for the light mesons, significantly decrease the values of their decay constants and, thus, bring them into agreement with experiment. For heavy-light mesons these contribution are much less pronounced, but permit to reduce uncertainties of the predicted decay constants. Their values agree with the results of lattice calculations and experimental data.

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