# Extended van Royen-Weisskopf formalism for lepton-antilepton meson decay widths within non-relativistic quark models

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.
Document type :
Journal articles

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Submitted on : Monday, February 4, 2002 - 4:26:52 PM
Last modification on : Thursday, November 19, 2020 - 12:58:35 PM

### Citation

L.A. Blanco, R. Bonnaz, B. Silvestre-Brac, F. Fernandez, A. Valcarce. Extended van Royen-Weisskopf formalism for lepton-antilepton meson decay widths within non-relativistic quark models. Nuclear Physics A, Elsevier, 2002, 699, pp.690-708. ⟨in2p3-00011013⟩

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