Paramagnetic effect of light quark loops on chiral symmetry breaking

Authors :: Sebastien Descotes
Luca Girlanda
Jan Stern
Robert, Suzanne
Institut de Physique Nucléaire d'Orsay (IPNO)
Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
S., Descote
Girlanda, Luca
J., Stern
Source :: Journal of High Energy Physics, Journal of High Energy Physics, Springer, 2000, 4, pp.041-1-041-16, ResearcherID, Scopus-Elsevier
Publication Year :: 2000
Publisher :: HAL CCSD, 2000.
Abstract: 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.<br />Comment: 15 pages, Latex, using JHEP.cls (included), 1 PS figure

Language :: English
ISSN :: 11266708 and 10298479
Database :: OpenAIRE
Journal :: Journal of High Energy Physics, Journal of High Energy Physics, Springer, 2000, 4, pp.041-1-041-16, ResearcherID, Scopus-Elsevier
Accession number :: edsair.doi.dedup.....8e2a08707f4ca135b73caaf22809c3ce

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