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Rho meson properties in the chiral theory framework

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Rho meson properties in the chiral theory framework

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dc.contributor.author Sanz Cillero, Juan José
dc.contributor.author Pich Zardoya, Antonio
dc.date.accessioned 2015-02-27T08:27:26Z
dc.date.available 2015-02-27T08:27:26Z
dc.date.issued 2003
dc.identifier.citation Sanz Cillero, Juan José Pich Zardoya, Antonio 2003 Rho meson properties in the chiral theory framework European Physical Journal C 27 4 587 599
dc.identifier.uri http://hdl.handle.net/10550/42478
dc.description.abstract 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 the final-state interactions. This provides many interesting properties, like the pole mass M-rho(pole) = 764.1 +/- 2.7(-2.5)(+4.0) MeV. At energies E greater than or similar to 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)(mu(0)) = (7.04 +/- 0.05(-0.27)(+0.19)) (.) 10(-3), at mu(0) = 770 MeV, and show how the running with the scale p 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.
dc.language.iso eng
dc.relation.ispartof European Physical Journal C, 2003, vol. 27, num. 4, p. 587-599
dc.subject Física
dc.title Rho meson properties in the chiral theory framework
dc.type journal article es_ES
dc.date.updated 2015-02-27T08:27:26Z
dc.identifier.doi 10.1140/epjc/s2003-01128-8
dc.identifier.idgrec 030912
dc.rights.accessRights open access es_ES

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