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Low-lying even parity meson resonances and spin-flavor symmetry revisited

AuthorsNieves, Juan Miguel ; García Recio, Carmen; Geng, Li Sheng; Salcedo, Lorenzo Luis; Wang, En ; Xie, Jujun
KeywordsChiral perturbation-theory
Invers Amplitude Method
Issue Date14-May-2013
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 87 (9): 096006 - 18 (2013)
AbstractWe review and extend the model derived in Garcia-Recio et al. [Phys. Rev. D 83, 016007 (2011)] to address the dynamics of the low-lying even-parity meson resonances. This model is based on a coupled-channels spin-flavor extension of the chiralWeinberg-Tomozawa Lagrangian. This interaction is then used to study the S-wave meson-meson scattering involving members not only of the pi octet, but also of the rho nonet. In this work, we study in detail the structure of the SU(6)-symmetry-breaking contact terms that respect (or softly break) chiral symmetry. We derive the most general local (without involving derivatives) terms consistent with the chiral-symmetry-breaking pattern of QCD. After introducing sensible simplifications to reduce the large number of possible operators, we carry out a phenomenological discussion of the effects of these terms. We show how the inclusion of these pieces leads to an improvement of the description of the J(P) = 2(+) sector, without spoiling the main features of the predictions obtained in the original model in the JP = 0(+) and J(P) = 1(+) sectors. In particular, we find a significantly better description of the I-G(J(PC)) =0(+)(2(++)), 1(-)(2(++)) and the I(JP)=1/2(2(+)) sectors, which correspond to the f(2)(1270), a(2)(1320), and K-2(*)(1430) quantum numbers, respectively.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.87.096006
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