Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/10991
 Title: Novel weak decays in doubly strange systems Author: Parreño García, AssumptaRamos Gómez, ÀngelsBennhold, Cornelius Keywords: Estructura nuclearReaccions nuclearsInteraccions febles (Física nuclear)Nuclear structureNuclear reactionsWeak interactions (Nuclear physics) Issue Date: 2001 Publisher: The American Physical Society Abstract: The strangeness-changing ($\Delta S = 1$) weak baryon-baryon interaction is studied through the nonmesonic weak decay of double-$\Lambda$ hypernuclei. Besides the usual nucleon-induced decay $\Lambda N \to N N$ we discuss novel hyperon-induced decay modes $\Lambda \Lambda \to \Lambda N$ and $\Lambda \Lambda \to \Sigma N$. These reactions provide unique access to the exotic $\Lambda \Lambda$K and $\Lambda \Sigma$K vertices which place new constraints on Chiral Pertubation Theory ($\chi$PT) in the weak SU(3) sector. Within a meson-exchange framework, we use the pseudoscalar $\pi,\eta,K$ octet for the long-range part while parametrizing the short-range part through the vector mesons $\rho, \omega, K^*$. Realistic baryon-baryon forces for the $S=0,-1$ and -2 sectors account for the strong interaction in the initial and final states. For $^6_{\Lambda \Lambda}$He the new hyperon-induced decay modes account for up to 4% of the total nonmesonic decay rate. Predictions are made for all possible nonmesonic decay modes. Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevC.65.015205 It is part of: Physical Review C, 2002, vol. 65, núm. 1, p. 015205-1-015205-11 Related resource: http://doi.org/10.1103/PhysRevC.65.015205 URI: http://hdl.handle.net/2445/10991 ISSN: 0556-2813 Appears in Collections: Articles publicats en revistes (Física Quàntica i Astrofísica)

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