Two chiral nonet model with massless quarks

Details Two chiral nonet model with massless quarks Two chiral nonet model with massless quarks

2007-07-05

arxiv.org/abs/0707.0843v1

Phys.Rev.D77:034006,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 8 figures

Scientific paper

10.1103/PhysRevD.77.034006

We present a detailed study of a linear sigma model containing one chiral nonet transforming under U(1)$_A$ as a quark-antiquark composite and another chiral nonet transforming as a diquark-anti diquark composite (or, equivalently from a symmetry point of view, as a two meson molecule). The model provides an intuitive explanation of a current puzzle in low energy QCD: Recent work has suggested the existence of a lighter than 1 GeV nonet of scalar mesons which behave like four quark composites. On the other hand, the validity of a spontaneously broken chiral symmetric description would suggest that these states be chiral partners of the light pseudoscalar mesons, which are two quark composites. The model solves the problem by starting with the two chiral nonets mentioned and allowing them to mix with each other. The input of physical masses in the SU(3) invariant limit for two scalar octets and an "excited" pion octet results in a mixing pattern wherein the light scalars have a large four quark content while the light pseudoscalars have a large two quark content. One light isosinglet scalar is exceptionally light. In addition, the pion pion scattering is also studied and the current algebra theorem is verified for massless pions which contain some four quark admixture.

Affiliated with

Also associated with

No associations

Rating

Two chiral nonet model with massless quarks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Two chiral nonet model with massless quarks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two chiral nonet model with massless quarks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-569982