6533b821fe1ef96bd127adc5
RESEARCH PRODUCT
Meson exchange in the weak decay of Lambda hypernuclei and the Gamma(n)/Gamma(p) ratio
D. JidoEulogio Oset BáguenaJuan Esteban Palomar Burdeussubject
Nuclear Theory (nucl-th)Nuclear TheoryNuclear TheoryFOS: Physical sciencesFísicaHigh Energy Physics::ExperimentNuclear Experimentdescription
We take an approach to the Lambda non-mesonic weak decay in nuclei based on the exchange of mesons. The one pion and one kaon exchange are considered, together with the exchange of two pions, either correlated, leading to an important scalar-isoscalar exchange (sigma-like exchange), or uncorrelated (box diagrams). Extra effects of omega exchange in the scalar-isoscalar channel are also considered. Constraints of chiral dynamics are used to generate these exchanges. A drastic reduction of the OPE results for the Gamma_n/Gamma_p ratio is obtained and the new results are compatible with all present experiments within errors. The absolute rates obtained for different nuclei are also in good agreement with experiment.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-01-23 |