Electromagnetic structure of vector mesons

A Magiera,H Ströher,A Z Dubničková,C Adamuščín,C Guaraldo,A Wrońska,S Dubnička

doi:10.1051/epjconf/20148105001

Abstract

Electromagnetic structure of the complete nonet of vector mesons (ρ 0 ,ρ + ,ρ − ,ω , φ,K ∗0 , K ∗+ , ¯ K ∗0 , K ∗− ) is investigated in the framework of the Unitary and Analytic model and insufficient experimental information on it is discussed.

Highlights

According to the SU(3) classification of hadrons the spin 1− particles are included in a vector meson nonet
The parametrizations (6) contain four free parameters aCρ ρ, tiρnC, tiρnM, tiρnQ to be ratio of the coupling constants and three effective thresholds, which can be found by a comparison of (6) with a few experimental points on ρ meson helicity amplitudes [6]
The K∗(892) meson represents isodublet of particles K∗(892)+, K∗(892)0 and to the nucleon EM form factors (FFs), its EM FFs can be decomposed into the isoscalar (S) and isovector (V) parts as follows

Summary

Introduction

According to the SU(3) classification of hadrons the spin 1− particles are included in a vector meson nonet. In general the EM structure of all vector particles, owing to the spin value 1, is completely described by three independent EM form factors (FFs). Since the neutral vector mesons ρ0, ω, φ from the nonet under consideration are self-conjugate particles obeying the crossing relation, their EM FFs are identically equal to zero in the whole region of definition. Further only the EM structure of ρ+, ρ−, K∗0, K∗+, K∗0, K∗− vector mesons will be investigated.

Results

Conclusion