Effective-Hamiltonian Approach to Hyperon Beta Decay

Effective Hamiltonian Approach to Hyperon Beta Decay with Final-State Baryon Polarization

Using an effective Hamiltonian approach, we obtain expressions for hyperon β decay final-state baryon polarization. Terms through second order in the energy release are retained. The resulting approximate expressions are much simpler and more compact than the exact expressions, and they agree closely with them. PACS numbers: 13.30.Ce Typeset using REVTEX 1 In decays such as Ξ → Λ e ν or the rec...

Importance of Future Hyperon Beta Decay Experiments

Recent results from the KTeV experiment at Fermilab using Ξ 0 hyperons have enabled a great leap in improving our understanding of elementary particle physics, especially with the first form-factor measurement from the semi-leptonic decay Ξ 0 → Σ + e − ¯ ν. This decay is a test of whether the standard model contains all of the needed parameters to fully describe hyperon beta decay. It was obser...

Hyperon radiative decay.

Effective Operators for Double-Beta Decay

We use a solvable model to examine double-beta decay, focusing on the neutrinoless mode. After examining the ways in which the neutrino propagator affects the corresponding matrix element, we address the problem of finite model-space size in shell-model calculations by projecting our exact wave functions onto a smaller subspace. We then test both traditional and more recent prescriptions for co...

Hyperon-nucleon interactions – a chiral effective field theory approach

We construct the leading order hyperon-nucleon potential in chiral effective field theory. We show that a good description of the available data is possible and discuss briefly further improvements of this scheme.