Why the pseudoscalar-meson mixing angle is - 10°

1 December 1975

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 12 (11) , 3770-3774
https://doi.org/10.1103/physrevd.12.3770

Abstract

We propose a simple approach to the problem of mixing in nonets which leads to an understanding of the nature of both the "ideal" mixing angle of 35° found for the vector and tensor mesons and the "nonideal" mixing angle of - 10° found for the pseudoscalar mesons. We argue that the pseudoscalar meson mixing angle is "nonideal" because of a near degeneracy in the masses of the strange and nonstrange pseudoscalar mesons. As by-products we predict that more massive nonets will be nearly ideal and that, if charmed quarks "exist," the low-lying charm-anticharm mesons will be very narrow.

Keywords

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