Abstract
In the following two Schladming Schools (1966 and 1967) Källén talked about his work on radiative correction to beta decay. In those days the prevalent model, for this process, was the point-like four-fermion interaction and the radiative corrections were divergent. It was popular to take the cutoff energy to be very large and by that one did not mean the Planck mass but the nucleon mass, roughly about one GeV! Källén’s original idea was that perhaps nature provides a cutoff in these processes because the nucleons are not point-like. Therefore, one should introduce form factors, which might help remove divergences.
Actually, with his work on radiative corrections, Källén was trying to switch to research in particle physics. This field interested him very much, after having learned the subject by lecturing and writing a book about it [1]. And he was indeed a master of doing complicated calculations. Radiative corrections, with all the integrals to be done and symmetry arguments to be employed, did present enough challenge to attract him. For more information on Källén’s work in this field see the article by Alberto Sirlin in PART IV.
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Jarlskog, C. (2014). The Schladming Schools 1966–68. In: Jarlskog, C. (eds) Portrait of Gunnar Källén. Springer, Cham. https://doi.org/10.1007/978-3-319-00627-7_57
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DOI: https://doi.org/10.1007/978-3-319-00627-7_57
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