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Dynamical fermion mass generation by a strong Yukawa interaction
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SYSNO ASEP 0025831 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Dynamical fermion mass generation by a strong Yukawa interaction Title Dynamické generování fermionových hmot silnou Yukawovou interakcí Author(s) Brauner, Tomáš (UJF-V) RID
Hošek, Jiří (UJF-V) ORCID, SAISource Title Physical Review D - ISSN 0556-2821
Roč. 72, č. 4 (2005), 045007Number of pages 1 s. Language eng - English Country US - United States Keywords dynamical mass generation ; Yukawa interaction Subject RIV BF - Elementary Particles and High Energy Physics R&D Projects LA 080 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GD202/05/H003 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10480505 - UJF-V (2005-2011) Annotation We consider a model with global Abelian chiral symmetry of two massless fermion fields interacting with a complex massive scalar field. We argue that the Schwinger-Dyson equations for the fermion and boson propagators admit ultraviolet-finite chiral-symmetry-breaking solutions provided the Yukawa couplings are large enough. The fermions acquire masses and the elementary excitations of the complex scalar field are the two real spin-zero particles with different masses. As a necessary consequence of the dynamical chiral symmetry breakdown both in the fermion and scalar sectors, one massless pseudoscalar Nambu-Goldstone boson appears in the spectrum as a collective excitation of both the fermion and the boson fields. Its effective couplings to the fermion and boson fields are calculable. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2006
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