Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-09-16
Phys.Rev. D61 (2000) 033007
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 4 postscript figures, references and comments on relevance of perturbative treatment of rho electromagnetic vertex a
Scientific paper
10.1103/PhysRevD.61.033007
The contribution of the rho^{\pm} vector meson to the tau -> pi pi nu gamma decay is considered as a potential source for the determination of the magnetic dipole moment of this light vector meson. In order to keep gauge-invariance of the whole decay amplitude, a procedure similar to the fermion loop-scheme for charged gauge bosons is implemented to incorporate the finite width effects of the rho^{\pm} vector meson. The absorptive pieces of the one-loop corrections to the propagators and electromagnetic vertices of the rho^{\pm} meson and W^{\pm} gauge boson have identical forms in the limit of massless particles in the loops, suggesting this to be a universal feature of spin-one unstable particles. Model-dependent contributions to the tau -> pi pi nu gamma decay are suppressed by fixing the two-pion invariant mass distribution at the rho meson mass value. The resulting photon energy and angular distribution is relatively sensitive to the effects of the rho magnetic dipole moment.
Castro Gabriel Lopez
Sanchez Genaro Toledo
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