1 /Nc approximation and universality of vector mesons
Volkov M.K. Osipov A.A. Pivovarov A.A. Nurlan K.
1 August 2021American Physical Society
Physical Review D
2021#104Issue 3
In this work, we argue that the observed differences in the value of the vector coupling constant extracted from the decays ρ→ππ (gρ=6.0), ρ→l+l- (gρ=5.0) and ω→l+l- (gρ=5.7), where l=e, μ, are an indication of the important role played by the 1/Nc corrections in the description of these processes. We show that an emission of a photon by charged meson loops in the ρ0,ω,φ→γ transitions is a key process that allows to describe above vector meson decays into two leptons with a single value gρ=6.0. Our result supports the idea of universality of neutral vector mesons and clarifies the role of accounting of 1/Nc corrections to its fulfilment.
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Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Institute of Nuclear Physics, 1 Ibragimova, Almaty, 050032, Kazakhstan
L. N. Gumilyov Eurasian National University, 2 Satpaev, Nur-Sultan, 010000, Kazakhstan
Bogoliubov Laboratory of Theoretical Physics
Institute of Nuclear Physics
L. N. Gumilyov Eurasian National University
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