Electromagnetic mass shift of pions in unified gauge field theories and the light-cone

L. Palla, G. Pócsik

Research output: Contribution to journalArticle

2 Citations (Scopus)


The electromagnetic mass shift of pions is discussed in unified gauge field theories of weak and electromagnetic interactions to second order of the electric charge and the pion mass, respectively. We calculate the contributions of the next to leading light-cone singularities (quark mass terms) and it is found that these do not contribute to the divergences in the mass shift provided the masses of the bare proton quark and neutron quark are equal. γ, Z, W, φ exchanges are taken into account. Different bare quark masses in general make the mass shift divergent. In the tadpole contribution, the Born term causes a divergence unless we extrapolate first to q2 = 0.

Original languageEnglish
Pages (from-to)168-176
Number of pages9
JournalNuclear Physics, Section B
Issue number1
Publication statusPublished - Dec 11 1974

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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