Non-mesonic weak decay of hypernuclei with effective field theory

FAIR NExt generation of ScientistS 2013

Pérez-Obiol, A.^1 ; Entem, D.R.^2 ; Juliá-Díaz, B.^1,3 ; Parreño, A.^1

Departament d'Estructura i Constituents de la Matèria, Institut de Ciències Del Cosmos (ICC), Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain^1

Grupo de Física Nuclear, IUFFyM, Universidad de Salamanca, E-37008 Salamanca, Spain^2

ICFO-Institut de Ciències Fotòniques, Av. Carl Friedrich Gauss 3, E-08860 Castelldefels (Barcelona), Spain^3

关键词: Effective field theory;    Hypernuclei;    Leading orders;    Low-energy;    Meson exchange;    Mesonic weak decay;    Numerical values;    Transferred momentum;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/503/1/012033/pdf
DOI  :  10.1088/1742-6596/503/1/012033

来源: IOP

【 摘 要 】

The ΛN → NN interaction, the main responsible for the decay of heavy hypernuclei, is described within the effective field theory (EFT) framework. The EFT is developed up to (2), where is the transferred momentum between the interacting baryons. Numerical values for the leading order low-energy constants are obtained by two means. First, from a fit to the hypernuclear decay observables, and second, by comparing the EFT to the one-meson-exchange model describing the same interaction. All the two-pion exchange diagrams entering at the next-to-leading in the EFT have been calculated.