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Peláez Sagredo, José Ramón ; Pennington, M. R. ; Ruiz de Elvira, Jacobo ; Wilson, D. J. | Amer Physical Soc | 2011-11-09The leading 1=N_c behavior of unitarized chiral perturbation theory distinguishes the nature of the ? and the : The is a qq? meson, while the ? is not. However, semilocal duality between resonances and Regge behavior cannot be satisfied for lar[...]texto impreso
We investigate the charged-neutral difference in the pion self-energy at finite temperature T. Within chiral perturbation theory (ChPT) we extend a previous analysis performed in the chiral and soft pion limits. Our analysis with physical pion m[...]texto impreso
Ruiz de Elvira, Jacobo ; Garcia Martin, R. ; Kami?ski, Robert ; Peláez Sagredo, José Ramón | American Institute of Physics | 2011We show how the new precise data on kaon decays together with forward dispersion relations, sum rules and once- and twice-subtracted Roy equations allow for a precise analysis of ? ? scattering. The once subtracted Roy equations provide a more [...]texto impreso
Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | Elsevier Science BV | 2010-10We examine the leading-N(c) behavior of the masses and transition matrix elements of some low-lying, few particle configurations in QCD. A truncation of the Fock space produces an effective, symmetric Hamiltonian that we diagonalize. The lowest [...]texto impreso
Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | Amer Physical Soc | 2010-10-14Four-quark correlators and the factorization hypothesis are analyzed in the meson sector within chiral perturbation theory. We define the four-quark condensate as lim(x -> 0) , which is equivalent to ot[...]texto impreso
Cohen, Thomas ; Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | American Physical Society | 2014-08-14We study the large Nc behavior of couplings among light meson states with different compositions in terms of quarks and gluons. We shortly review the most common compositions of mesons, which are of interest for the understanding of low-lying me[...]texto impreso
We present and analyze a new set of Ward Identities which shed light on the distinction between different patterns of chiral symmetry restoration in QCD, namely O(4) vs O(4) x U(1)_A. The degeneracy of chiral partners for all scalar and pseudosc[...]texto impreso
Garcia-Martin, R. ; Kami?ski, Robert ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo ; Yndurain, F.J. | Amer Physical Soc | 2011-04-04We improve our description of ? ? scattering data by imposing additional requirements on our previous fits, in the form of once-subtracted Roy-like equations, while extending our analysis up to 1100 MeV. We provide simple and ready to use parame[...]texto impreso
Precise determination of the f(0)(600) and f(0)(980) pole parameters from a dispersive data analysis
Garcia-Martin, R ; Kami?ski, Robert ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | American Physical Society | 2011-08-09We use our latest dispersive analysis of ? ? scattering data and the very recent K_(l4) experimental results to obtain the mass, width, and couplings of the two lightest scalar-isoscalar resonances. These parameters are defined from their associ[...]texto impreso
Pseudoscalar susceptibilities and quark condensates: chiral restoration and lattice screening masses
We derive the formal Ward identities relating pseudoscalar susceptibilities and quark condensates in three-flavor QCD, including consistently the 77-n' sector and the U-A(1) anomaly. These identities are verified in the low-energy realization pr[...]texto impreso
Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | Amer Physical Soc | 2013-01-02We analyze the properties of four-quark condensates and scalar susceptibilities in the meson gas, within finite temperature chiral perturbation theory (ChPT). The breaking of the factorization hypothesis does not allow for a finite four-quark co[...]
