Chiral and U(1)_A restorations high in the hadron spectrum, semiclassical approximation and large N_c

Details Chiral and U(1)_A restorations high in the hadron spectrum, semiclassical approximation and large N_c Chiral and U(1)_A restorations high in the hadron spectrum, semiclassical approximation and large N_c

2004-11-21

arxiv.org/abs/hep-ph/0411281v4

Int.J.Mod.Phys. A21 (2006) 475-486

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages. The ms has been expanded to be a full length regular paper. A few Tables have been added. A list of references has b

Scientific paper

10.1142/S0217751X0602533X

In quantum systems with large $n$ (radial quantum number) or large angular momentum the semiclassical (WKB) approximation is valid. A physical content of the semiclassical approximation is that the quantum fluctuations effects are suppressed and vanish asymptotically. The chiral as well as $U(1)_A$ breakings in QCD result from quantum fluctuations. Hence these breakings must be suppressed high in the spectrum and the spectrum of high-lying hadrons must exhibit $U(2)_L \times U(2)_R$ symmetry of the classical QCD Lagrangian. This argument can be made stronger for mesons in the large $N_c$ limit. In this limit all mesons are stable against strong decays and the spectrum is infinite. Hence, one can excite mesons of arbitrary large size with arbitrary large action, in which case the semiclassical limit is manifest. Actually we do not need the exact $N_c=\infty$ limit. For any large action there always exist such $N_c$ that the isolated mesons with such an action do exist and can be described semiclassically. From the empirical fact that we observe multiplets of chiral and $U(1)_A$ groups high in the hadron spectrum it follows that $N_c=3$ is large enough for this purpose.

Affiliated with

Also associated with

No associations

Rating

Chiral and U(1)_A restorations high in the hadron spectrum, semiclassical approximation and large N_c 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 Chiral and U(1)_A restorations high in the hadron spectrum, semiclassical approximation and large N_c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chiral and U(1)_A restorations high in the hadron spectrum, semiclassical approximation and large N_c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-590675