σ meson exchange effect on non-mesonic hypernuclear weak decay observables

We analyze the influence of σ meson exchange on the main non-mesonic hypernuclear weak decay observables: Total rate Γ<sub>NM</sub>, neutron-to-proton branching ratio Γ<sub>n/p</sub>, and proton asymmetry parameter a<sub>Λ</sub>. The σ meson exchange is added to t...

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Detalles Bibliográficos
Autores principales: Barbero, César Alberto, Mariano, Alejandro Edgardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Ciencias Exactas
Física
meson exchange
non-mesonic hypernuclear weak decay
Physics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126519
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126519
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
meson exchange
non-mesonic hypernuclear weak decay
Physics
spellingShingle Ciencias Exactas
Física
meson exchange
non-mesonic hypernuclear weak decay
Physics
Barbero, César Alberto
Mariano, Alejandro Edgardo
σ meson exchange effect on non-mesonic hypernuclear weak decay observables
topic_facet Ciencias Exactas
Física
meson exchange
non-mesonic hypernuclear weak decay
Physics
description We analyze the influence of σ meson exchange on the main non-mesonic hypernuclear weak decay observables: Total rate Γ<sub>NM</sub>, neutron-to-proton branching ratio Γ<sub>n/p</sub>, and proton asymmetry parameter a<sub>Λ</sub>. The σ meson exchange is added to the standard strangeness-changing weak ΛN → 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<sub>NM</sub> and Γ<sub>n/p</sub> experimental data for ⁵<sub>Λ</sub>He. Numerical results for the remaining observables of ⁵<sub>Λ</sub>He and all the observables of ¹²<sub>Λ</sub>C decays are presented. They clearly show that the addition of the σ meson improves the agreement with the data. However, its effect it is not enough to reproduce well the a<sub>Λ</sub> values, which means that other improvements of the model must be explored to explain the puzzle posed by the experiments.
format Articulo
Articulo
author Barbero, César Alberto
Mariano, Alejandro Edgardo
author_facet Barbero, César Alberto
Mariano, Alejandro Edgardo
author_sort Barbero, César Alberto
title σ meson exchange effect on non-mesonic hypernuclear weak decay observables
title_short σ meson exchange effect on non-mesonic hypernuclear weak decay observables
title_full σ meson exchange effect on non-mesonic hypernuclear weak decay observables
title_fullStr σ meson exchange effect on non-mesonic hypernuclear weak decay observables
title_full_unstemmed σ meson exchange effect on non-mesonic hypernuclear weak decay observables
title_sort σ meson exchange effect on non-mesonic hypernuclear weak decay observables
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/126519
work_keys_str_mv AT barberocesaralberto smesonexchangeeffectonnonmesonichypernuclearweakdecayobservables
AT marianoalejandroedgardo smesonexchangeeffectonnonmesonichypernuclearweakdecayobservables
bdutipo_str Repositorios
_version_ 1764820450826780673

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