Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-08-25
Phys.Rev.D59:074026,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 3 figures
Scientific paper
10.1103/PhysRevD.59.074026
We investigate the "family" relationship of a possible scalar nonet composed of the a_0(980), the f_0(980) and the \sigma and \kappa type states found in recent treatments of \pi\pi and \pi K scattering. We work in the effective Lagrangian framework, starting from terms which yield "ideal mixing" according to Okubo's original formulation. It is noted that there is another solution corresponding to dual ideal mixing which agrees with Jaffe's picture of scalars as qq\bar q \bar q states rather than as q\bar q states. At the Lagrangian level there is no difference in the formulation of the two cases (other than the numerical values of the coefficients). In order to agree with experiment, additional mass and coupling terms which break ideal mixing are included. The resulting model turns out to be closer to dual ideal mixing than to conventional ideal mixing; the scalar mixing angle is roughly -17 degrees in a convention where dual ideal mixing is 0 degrees.
Black Deirdre
Fariborz Amir H.
Sannino Francesco
Schechter Joseph
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