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EnglishA tensorial coupling in the effective weak hamiltonian has been observed in a recent experiment on the decay pi- --> e- nu(e)GAMMABAR. The coupling constant for this interaction is about 10(6) times the one predicted by the standard model. If this effect really exists in the DELTAS = 0 effective weak hamiltonian, we suggest that an analogous kind of interaction may exist in the DELTAS = 1 sector. The decays K+ --> e+nu(e)gamma and K+ --> mu+nu(mu)gamma are reanalysed in the light of a possible tensorial coupling in the DELTAS = 1 effective hamiltonian. If this new effect exists also in the DELTAS = 1 sector, with the same coupling as in the AS= 0 sector, and if it is suppressed by the Cabibbo angle, then it can be easily observed at the DAPHNE laboratory in the mu decay of the K+. If this effect is not suppressed by the Cabibbo angle, then also the electron channel is very good for detecting it.
| Titolo: | THE DECAYS K+ - E+NU-E-GAMMA AND K+- MU+NU-MU-GAMMA, AND TENSORIAL COUPLINGS IN THE EFFECTIVE WEAK HAMILTONIAN |
| Autori: | |
| Data di pubblicazione: | 1993 |
| Rivista: | |
| Abstract: | A tensorial coupling in the effective weak hamiltonian has been observed in a recent experiment on the decay pi- --> e- nu(e)GAMMABAR. The coupling constant for this interaction is about 10(6) times the one predicted by the standard model. If this effect really exists in the DELTAS = 0 effective weak hamiltonian, we suggest that an analogous kind of interaction may exist in the DELTAS = 1 sector. The decays K+ --> e+nu(e)gamma and K+ --> mu+nu(mu)gamma are reanalysed in the light of a possible tensorial coupling in the DELTAS = 1 effective hamiltonian. If this new effect exists also in the DELTAS = 1 sector, with the same coupling as in the AS= 0 sector, and if it is suppressed by the Cabibbo angle, then it can be easily observed at the DAPHNE laboratory in the mu decay of the K+. If this effect is not suppressed by the Cabibbo angle, then also the electron channel is very good for detecting it. |
| Handle: | http://hdl.handle.net/11368/2634229 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/0370-2693(93)91171-I |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
