Two-pion-exchange in the non-mesonic weak decay of $Λ$-hypernuclei

Details Two-pion-exchange in the non-mesonic weak decay of $Λ$-hypernuclei Two-pion-exchange in the non-mesonic weak decay of $Λ$-hypernuclei

2007-05-02

arxiv.org/abs/0705.0231v1

Phys.Lett.B657:180-186,2007

Physics

Nuclear Physics

Nuclear Theory

20 pages, 3 figures Uses elsart.cls

Scientific paper

10.1016/j.physletb.2007.08.094

The non-mesonic weak decay of $\Lambda$--hypernuclei is studied within a one-meson-exchange potential supplemented by a chirally motivated two-pion-exchange mechanism. The effects of final state interactions on the outgoing nucleons are also taken into account. In view of the severe discrepancies between theoretical expectations and experimental data, particular attention is payed to the asymmetry of the protons emitted by polarized hypernuclei. The one-meson-exchange model describes the non-mesonic rates and the neutron-to-proton ratio satisfactorily but predicts a too large and negative asymmetry parameter. The uncorrelated and correlated two-pion mechanisms change the rates moderately, thus maintaining the agreement with experiment. The modification in the strength and sign of some decay amplitudes becomes crucial and produces asymmetry parameters which lie well within the experimental observations.

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