ar X iv : n uc l - th / 0 10 60 70 v 1 2 9 Ju n 20 01 Λ - Σ conversion in 4 Λ He and 4 Λ H based on four - body calculation

ar X iv : n uc l - th / 0 20 70 77 v 1 2 6 Ju l 2 00 2 Λ + c - and Λ b - hypernuclei

ar X iv : n uc l - th / 9 90 30 34 v 1 1 2 M ar 1 99 9 Particle Mixing and Charge Asymmetric

We calculate the contributions of a particular set of charge asymmetric ΛN interactions to the difference of the separation energies of 4 Λ He and 4 Λ H. We use perturbation theory with four-body variational Monte Carlo wave functions calculated from a Hamiltonian with two-and three-hadron forces. We compare with the data and with an earlier calculation made by one of us which employed a two-bo...

ar X iv : n uc l - th / 9 71 10 54 v 1 2 6 N ov 1 99 7 The π + – emission puzzle in 4 Λ He decay

We re-examine the puzzling π emission from the weak decay of 4ΛHe and propose an explanation in terms of a three–body decay of the virtual Σ. Such a resolution of the π decay puzzle is consistent with the calculated Σ probability in light Λ hypernuclei as well as the experimentally observed π energy spectrum and s–wave angular distribution. Typeset using REVTEX

ar X iv : n uc l - th / 0 60 20 72 v 1 2 7 Fe b 20 06 Study of Pentaquark and Λ ( 1405 )

We perform a five-body calculation for pentaquark (q 4 ¯ q) state of Λ(1405) as well as the three-body calculations for the ground state baryons and the Λ(1405), and two-body calculations for mesons. The hamiltonian, which reproduces reasonably well the energies of ground state baryons (N, Λ, Σ, Ξ and ∆) and mesons (π, K, ρ, K *), includes kinetic energy of semi-relativistic form, linear confin...

ar X iv : n uc l - th / 9 70 90 13 v 1 8 S ep 1 99 7 S - wave Pairing of Λ Hyperons in Dense Matter

In this work we calculate the 1 S 0 gap energies of Λ hyperons in neutron star matter. The calculation is based on a solution of the BCS gap equation for an effective G-matrix parameterization of the Λ−Λ interaction with a nuclear matter background, presented recently by Lanskoy and Yamamoto. We find that a gap energy of a few tenths of MeV is expected for Λ Fermi momenta up to about 1.3 fm −1....