The ${\mit \Sigma }_{\pi N}$ Term, Chiral Multiplet Mixing and Hidden Strangeness in the Nucleon

Abstract

In this paper, we discuss the γp → K 0 Σ + and γn → K 0 Σ 0 reactions, with a peculiar behavior around the K * 0 Λ threshold, due to a 1/2 − resonance around 2035 MeV. Similarly, we discuss a BES experiment, J/ψ → ηK * 0 K * 0 decay, which supports the existence of a new h 1 resonance around 1830 MeV that was predicted from the vector-vector interaction. A short discussion is then made about recent advances in the charm and beauty sectors.

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleonDmitrašinović1, Chen2 2016Phys. Rev. CSelf Cite

“…We based our calculations on the chiral mixing formalism and the phenomenology developed previously in Refs. [33,34,43,44,47].…”

“…Then in Section III, which is devoted to a construction of a two-and three-flavor chiral Lagrangians that reproduce the chiral mixing phenomenology, we present the χSB terms and the canonical field variables, and show that the Noether charges close the chiral algebra although g A = 1. In Section IV we examine the pion-nucleon sigma term Σ πN -some of these results have been reported at conferences [43,44]. In Section V we examine the kaon-nucleon Σ KN term, and in Section VI we summarize the results.…”

“…[30,42], and in Refs. [43,44] we have briefly presented our results for the pion-nucleon sigma term Σ πN in the chiral mixing approach. The result of Σ πN depends substantially on g (1) A , in contrast to the BNL model one [21], and agrees with the experimental value (almost embarrassingly) well.…”