engleski

Anticrossing in the η-η′ complex

The Dyson-Schwinger approach to mesons as quark–antiquark bound states produces a very satisfactory description of the whole light pseudoscalar nonet, both at zero and at finite temperatures [1]. Especially interesting is the temperature behavior of the η–η' complex, where results for masses differ very greatly for various possible relationships between the chiral restoration temperature and the temperature of melting of the topological susceptibility χ. Namely, χ is connected with the quantity β in the η–η' mass matrix as χ = β(2 +X2) /6, where X = fπ/ . For example, in certain regimes, the “mass” of ηNS, namely M_ηNS, for some temperatures becomes larger than M_ηS, the “mass” of ηS [1] ; that is, M_ηNS and M_ηNS can cross.

Anticrossing eta eta' mesons Dyson-Schwinger

Part 4. Problems and Solutions