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

6533b820fe1ef96bd127a42c

RESEARCH PRODUCT

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

B. Silvestre-brac Francisco Fernández R. Bonnaz A. Valcarce L. A. Blanco

subject

Quark Physics Nuclear and High Energy Physics Instanton Particle physics Meson Nuclear Theory 010308 nuclear & particles physics [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th]High Energy Physics::Lattice Nuclear Theory High Energy Physics::Phenomenology Constituent quark FOS: Physical sciences 01 natural sciences Nuclear Theory (nucl-th)Formalism (philosophy of mathematics)0103 physical sciences High Energy Physics::Experiment 010306 general physics Relativistic quantum chemistry Wave function Lepton

description

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.

year	journal	country	edition	language
2001-09-27

10.1016/s0375-9474(01)01290-8 http://hal.in2p3.fr/in2p3-00011013

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