Paramagnetic effect of light quark loops on Chiral Symmetry Breaking

Details Paramagnetic effect of light quark loops on Chiral Symmetry Breaking Paramagnetic effect of light quark loops on Chiral Symmetry Breaking

1999-10-28

arxiv.org/abs/hep-ph/9910537v1

JHEP 0001 (2000) 041

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, Latex, using JHEP.cls (included), 1 PS figure

Scientific paper

10.1088/1126-6708/2000/01/041

We argue that light quark loops produce a paramagnetic suppression of infrared-sensitive order parameters such as , as the number N_f of light fermions increases. The possibly strong dependence of on N_f is related to the observed Zweig rule violation in the scalar channel. Presuming the existence of a chiral phase transition for not too large N_f, we discuss the phenomenological possibilities of separately determining the two-flavour and three-flavour condensates and the quark mass ratio r=2m_s/(m_u+m_d). The issue is closely related to the interpretation of new forthcoming precise pi-pi data at low energy.

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