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Title: Chiral model for q-barq and qq-barqq mesons

Abstract

We point out that the spectrum of pseudoscalar and scalar mesons exhibits a quasidegenerate chiral nonet in the energy region around 1.4 GeV whose scalar component has a slightly inverted spectrum. Based on the empirical linear rising of the mass of a hadron with the number of constituent quarks which yields a mass around 1.4 GeV for tetraquarks, we conjecture that this quasichiral nonet arises from the mixing of a chiral nonet composed of tetraquarks with conventional q-barq states. We explore this possibility in the framework of a chiral model assuming a tetraquark chiral nonet around 1.4 GeV with chiral symmetry realized directly. We stress that U{sub A}(1) transformations can distinguish q-barq from tetraquark states, although it cannot distinguish specific dynamics in the later case. We find that the measured spectrum is consistent with this picture. In general, pseudoscalar states arise as mainly q-barq states but scalar states turn out to be strong admixtures of q-barq and tetraquark states. We work out also the model predictions for the most relevant couplings and calculate explicitly the strong decays of the a{sub 0}(1450) and K{sub 0}*(1430) mesons.

Authors:
;  [1]
  1. Instituto de Fisica, Universidad de Guanajuato, Lomas del Bosque 103, Fraccionamiento Lomas del Campestre, 37150, Leon Guanajuato (Mexico)
Publication Date:
OSTI Identifier:
20705637
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 70; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.70.094043; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHIRAL SYMMETRY; CHIRALITY; GEV RANGE; HADRONIC PARTICLE DECAY; K*0-1430 MESONS; KAONS; MASS FORMULAE; NONLINEAR PROBLEMS; QUANTUM FIELD THEORY; QUARK MODEL; QUARKS; REST MASS; SCALARS; SPARTICLES; STRESSES; U-1 GROUPS; UNITARY SYMMETRY

Citation Formats

Napsuciale, Mauro, and Rodriguez, Simon. Chiral model for q-barq and qq-barqq mesons. United States: N. p., 2004. Web. doi:10.1103/PhysRevD.70.094043.
Napsuciale, Mauro, & Rodriguez, Simon. Chiral model for q-barq and qq-barqq mesons. United States. https://doi.org/10.1103/PhysRevD.70.094043
Napsuciale, Mauro, and Rodriguez, Simon. 2004. "Chiral model for q-barq and qq-barqq mesons". United States. https://doi.org/10.1103/PhysRevD.70.094043.
@article{osti_20705637,
title = {Chiral model for q-barq and qq-barqq mesons},
author = {Napsuciale, Mauro and Rodriguez, Simon},
abstractNote = {We point out that the spectrum of pseudoscalar and scalar mesons exhibits a quasidegenerate chiral nonet in the energy region around 1.4 GeV whose scalar component has a slightly inverted spectrum. Based on the empirical linear rising of the mass of a hadron with the number of constituent quarks which yields a mass around 1.4 GeV for tetraquarks, we conjecture that this quasichiral nonet arises from the mixing of a chiral nonet composed of tetraquarks with conventional q-barq states. We explore this possibility in the framework of a chiral model assuming a tetraquark chiral nonet around 1.4 GeV with chiral symmetry realized directly. We stress that U{sub A}(1) transformations can distinguish q-barq from tetraquark states, although it cannot distinguish specific dynamics in the later case. We find that the measured spectrum is consistent with this picture. In general, pseudoscalar states arise as mainly q-barq states but scalar states turn out to be strong admixtures of q-barq and tetraquark states. We work out also the model predictions for the most relevant couplings and calculate explicitly the strong decays of the a{sub 0}(1450) and K{sub 0}*(1430) mesons.},
doi = {10.1103/PhysRevD.70.094043},
url = {https://www.osti.gov/biblio/20705637}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 9,
volume = 70,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 2004},
month = {Mon Nov 01 00:00:00 EST 2004}
}