Quantum loops in the resonance chiral theory: the vector form factor
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Quantum loops in the resonance chiral theory: the vector form factor

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Quantum loops in the resonance chiral theory: the vector form factor

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Rosell Escribà, Ignasi; Sanz Cillero, Juan José; Pich Zardoya, Antonio Perfil
This document is a artículoDate2004

Este documento está disponible también en : http://hdl.handle.net/10550/42488
We present a calculation of the Vector Form Factor at the next-to-leading order in the 1/N-C expansion, within the framework of Resonance Chiral Theory. The calculation is performed in the chiral limit, and with two dynamical quark flavours. The ultraviolet behaviour of quantum loops involving virtual resonance propagators is analyzed, together with the kind of counterterms needed in the renormalization procedure. Using the lowest-order equations of motion, we show that only a few combinations of local couplings appear in the final result. The low-energy limit of our calculation reproduces the standard Chiral Perturbation Theory formula, allowing us to determine the resonance contribution to the chiral low-energy couplings, at the next-to-leading order in 1/N-C, keeping a full control of their renormalization scale dependence.

    Rosell Escribà, Ignasi Sanz Cillero, Juan José Pich Zardoya, Antonio 2004 Quantum loops in the resonance chiral theory: the vector form factor Journal of High Energy Physics 2004 8 042-1 042-25
http://dx.doi.org/10.1088/1126-6708/2004/08/042

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