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Title of Journal: Nuovo Cim

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Abbravation: Il Nuovo Cimento (1955-1965)

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Società Italiana di Fisica

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DOI

10.1007/bf01946869

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1827-6121

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Representations of the Poincaré group associated t

Authors: E G Beltrametti G Luzzatto
Publish Date: 2007/11/19
Volume: 36, Issue: 4, Pages: 1217-1229
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Abstract

We analyse a possible extension to unstable systems of the usual connection between the irreducible representations of the Poincaré group and the mass and spin numbers of stable particles This is done by a study of nonunitary representations of the real Poincaré group associated to complex values of the energymomentum fourvector π The representations turn out to be onedimensional and exhibit some similarities with the unitary representations corresponding to zero massAnalizziamo una possibile estensione al caso di sistemi instabili della usuale connessione tra le rappresentazioni irriducibili del grnppo di Poincaré ed i numeri di massa e spin di particelle stabili CiÒ è fatto studiando le rappresentazioni non unitarie del gruppo reale di Poincaré associate a valori complessi del quadrivettore energiaimpulso π Le rappresentazioni risultano unidimensionali e mostrano qualche analogia con quelle unitarie corrispondenti a massa nulla

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  13. A novel approach to elementary scattering theory
  14. Compound-nucleus radiative capture cross-section in the mev energy-range and nuclear-level density
  15. Sur le calcul des constantes vibrationnelles de l’oxyde azoteux
  16. Polarization effects in bremsstrahlung
  17. A renormalized, ghost-free lee model
  18. Investigation of the possibility of a π-λ resonance in the case of different parities of λ and ɛ
  19. The high-energy muon flux at sea level obtained from an observation of the burst-size spectrum
  20. $$\bar K - \mathcal{N}$$ scattering in the mandelstam representationscattering in the mandelstam representation
  21. 232 Th and 238 U fission induced by low-energy monochromatic γ-rays
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  23. On the measurements of ionization in nuclear plates
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  25. The scattering of photons by photons
  26. On a new approach to alpha-decay and its application to the angular correlation of the decay $${}^{233}U\mathop \to \limits_\alpha {}^{229}Th\mathop \to \limits_\gamma {}^{229}Th$$
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