$σ$ meson exchange effect on nonmesonic hypernuclear weak decay observables
| dc.creator | Barbero, C. | |
| dc.creator | Mariano, A. | |
| dc.date | 2005-09-15 | |
| dc.date.accessioned | 2026-07-07T10:30:42Z | |
| dc.date.available | 2026-07-07T10:30:42Z | |
| dc.description | We analyze the influence of $σ$ meson exchange on the main nonmesonic hypernuclear weak decay observables: the total rate, $Γ_{NM}$, the neutron-to-proton branching ratio, $Γ_{n/p}$, and the proton asymmetry parameter, $a_Λ$. The $σ$ meson exchange is added to the standard strangeness-changing weak $ΛN\to NN$ transition potential, which includes the exchange of the complete pseudoscalar and vector mesons octet ($π$, $η$, $K$, $ρ$, $ω$, $K^*$). Using a shell model formalism, the $σ$ meson weak coupling constants are adjusted to reproduce the recent $Γ_{NM}$ and $Γ_{n/p}$ experimental data for $^5_ΛHe$. Numerical results for the remaining observables of $^5_ΛHe$ and all the observables of $^{12}_ΛC$ decays are presented. They clearly show that the addition of the $σ$ meson, in spite of improving some observables values, is not enough to reproduce simultaneously all the measurements, and the puzzle posed by the experimental data remains unexplained. | |
| dc.description | 4 pages, 1 figure. Submitted for publication in Phys. Rev | |
| dc.identifier | https://arxiv.org/abs/nucl-th/0509037 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/0509037 | |
| dc.identifier | Phys.Rev.C73:024309,2006 | |
| dc.identifier | doi:10.1103/PhysRevC.73.024309 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178210 | |
| dc.subject | Nuclear Theory | |
| dc.title | $σ$ meson exchange effect on nonmesonic hypernuclear weak decay observables | |
| dc.type | text |