Summary
A possibility of explaining the anomalously large mass of the μ-meson by taking account of the high singularity of the weak Fermi interaction is discussed. It is shown that a single spinor field\(\mathop \psi \limits^{\left( w \right)} \) interacting weakly with a two-component neutrino field can describe the electron and the μ-meson as its ground and excited states respectively by solving an eigenvalue problem which comes from the negativeness of the self-energy of\(\mathop \psi \limits^{\left( w \right)} \) due to the adopted weak Fermi interaction and by using an invariant cut-off method. The order of magnitude of the cut-off parameter is about the inverse of the weak coupling constantl w (l w=6.85·10−17 cm). The possible importance of the high singularity of the Fermi interaction is emphasized. The problem of the μ-meson decay is also discussed.
Riassunto
Si discute un tentativo per interpretare la stranamente grande massa del mesone μ tenendo presente la forte singolarità dell’interazione debole alla Fermi. Risolvendo un problema agli autovalori che si ottiene per il fatto che la self-energia del campo\(\mathop \psi \limits^{\left( w \right)} \) derivante dall’interazione debole alla Fermi è negativa e usando un metodo invariante di cut-off, si mostra che un unico campo spinoriale\(\mathop \psi \limits^{\left( w \right)} \) interagente debolmente con un campo di neutrino a due componenti può descrivere l’elettrone e il mesone μ come suoi stati fondamentale ed eccitato rispettivamente. L’ordine di grandezza del parametro di cut-off è dell’ordine dell’inverso della costante d’accoppiamento debolel w (l w=6.85·10−17 cm). Si discute anche il problema del decadimento del mesone μ.
Similar content being viewed by others
References
R. P. Feynman:CERN Conference Report (Geneva, 1958), p. 216.
J. Schwinger:Ann. of Phys.,2, 407 (1957);W. S. Cowland:Nuclear Phys.,8, 397 (1958);I. R. Gatland:Nuclear Phys.,9, 267 (1958);14, 205 (1959).
G. Marx andK. L. Nagy:Nuclear Phys.,12, 125 (1959);G. Marx:Wiss., Zeits. (Jena),8, 371 (1958–59);J. L. Ferreira andY. Katayama:Progr. Theor. Phys.,23, 776 (1960).
H. Kita:Prog. Theor. Phys. Suppl. No.9, 5 (1959).
M. Gell-Mann andF. Low:Phys. Rev.,84, 350 (1951).
W. Pauli andM. E. Rose:Phys. Rev.,49, 462 (1936);R. Kawabe andH. Umezawa:Prog. Theor. Phys.,4, 461 (1949);S. N. Gupta:Proc. Phys. Soc.,63, 681 (1950).
G. Feinberg, P. Kabir andS. Weinberg:Phys. Rev. Lett.,3, 527 (1959).
N. Cabibbo andR. Gatto:Phys. Rev.,116, 1334 (1959);N. Cabibbo, R. Gatto andC. Zemach:Nuovo Cimento,16, 168 (1960).
G. Wataghin:Zeits. f. Phys.,88, 92 (1934);Nuovo Cimento,5, 689 (1957);9, 519 (1958).
R. P. Feynman andG. Speisman:Phys. Rev.,94, 500 (1954).
G. F. Chew andF. E. Low:Phys. Rev.,101, 1570, 1579 (1956).
In connection with this, see:H. Umezawa, M. Konuma andK. Nakagawa:Nuclear Phys.,7, 169 (1958);H. Umezawa:Prog. Theor. Phys. Suppl. No.7, 69 (1959).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kita, H., Predazzi, E. On the μ-meson mass. Nuovo Cim 17, 908–918 (1960). https://doi.org/10.1007/BF02732135
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02732135