Weak interactions are weak at high energies

Tom Banks, Glennys Farrar, Michael Dine, Dimitra Karabali, Bunji Sakita

    Research output: Contribution to journalArticlepeer-review


    We use a Schrödinger picture version of the instanton calculus to analyze the suggestion that nonperturbative instanton effects, such as baryon number violation in the electroweak interaction, can become large in high-energy scattering. We confirm that the euclidean instanton results of Ringwald, Espinosa and others are correct, for models with instantons of definite size, at low energy, and present a physical explanation of the energy dependence of amplitudes found by these authors. However, we show that their dilute instanton gas approximation breaks down at higher energy. Our techniques permit us to extend the energy regine in which a reliable calculation can be done. We find that the basic e 1 α suppression of the total cross section for instanton-induced processes persists at all energies, even ∼M/α.

    Original languageEnglish (US)
    Pages (from-to)581-595
    Number of pages15
    JournalNuclear Physics, Section B
    Issue number3
    StatePublished - Dec 31 1990

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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