An EFT for the weak Lambda N interaction

作者：Parreno A^*; Bennhold C; Holstein BR

来源：Nuclear Physics A, 2005, 754: 127C-136C.

DOI：10.1016/j.nuclphysa.2005.01.008

The nonleptonic weak vertical bar AS vertical bar = 1 Lambda N interaction, responsible for the dominant, nonmesonic decay of all but the lightest hypemuclei, is studied in the framework of an effective field theory. The long-range physics is described through tree-level exchange of the SU(3) Goldstone bosons (pi and K), while the short-range potential is parametrized in terms of lowest-order contact terms obtained from the most general non-derivative local four-fermion interaction. Fitting to available weak hypernuclear decay rates for He-5(Lambda), B-11(Lambda) and C-12(Lambda) yields reasonable values for the low-energy constants.

• 出版日期2005-5-30