Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-08-22
Eur.Phys.J.C27:587-599,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 8 figures, Latex file
Scientific paper
10.1140/epjc/s2002-01128-8
We study the mass, width and couplings of the lightest resonance multiplet with I(J^{PC})=1(1^{--}) quantum numbers. Effective field theories based on chiral symmetry are employed in order to describe the form factor associated with the two-pseudoscalar matrix element of the QCD vector current. The bare poles of the intermediate resonances are regularized through a Dyson-Schwinger-like summation. We explore the role of the resonance width in physical observables and make a coupled-channel analysis of final-state interactions. This provides many interesting properties, as the pole mass M_rho{pole}= 764.1 +- 2.7 +4.0-2.5 MeV. At energies E~1 GeV, a second 1(1^{--}) resonance multiplet is considered in order to describe the data in a more consistent way. From the phenomenologically extracted resonance couplings, we obtain the chiral coupling L_9^r(mu0)= (7.04 +- 0.05 +0.19-0.27)* 10^{-3}, at mu0=770$ MeV, and show how the running with the scale mu affects the resonance parameters. A 1/N_C counting is adopted in this work and the consistency of the large--N_C expansion is tested. Finally, we make an estimation of the contribution from diagrams with resonances in crossed channels.
Pich Antonio
Sanz-Cillero Juan Jose
No associations
LandOfFree
Rho Meson Properties in the Chiral Theory Framework does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Rho Meson Properties in the Chiral Theory Framework, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rho Meson Properties in the Chiral Theory Framework will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-402265