Contact terms in γγ→π+π-π+π- transitions

C. Ayala, A. Bramon, F. Cornet

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)


The contribution of contact terms (originated by gauge invariance) to the γγ→ρ{variant}0π+π- transition is evaluated. They are shown to play an essential role in order to explain the large cross section of γγ → π+π-π+π- and the π+π- invariant mass distributions recently observed at PETRA and SPEAR. © 1981.
Original languageEnglish
Pages (from-to)235-237
JournalPhysics Letters B
Issue number3
Publication statusPublished - 10 Dec 1981


Dive into the research topics of 'Contact terms in γγ→π+π-π+π- transitions'. Together they form a unique fingerprint.

Cite this