Note on the Strangeness Conserving β-Decays of Σ±-hyperons Σ±→ Λ+e±±ν

Double beta decay of Σ− hyperons

We compute the strangeness-conserving double beta decay of Σ hyperons, which is the only hadronic system that can undergo such decays. We consider both, the lepton number conserving Σ → Σeeν̄ν̄ (ββΣ2ν ) and the lepton number violating Σ → Σee (ββΣ0ν) modes. The branching ratios of these ββ decays are suppressed at the level of 10 considering a light neutrino scenario in the case of the ββΣ0ν chan...

Chiral dynamics of Σ-hyperons in the nuclear medium

Using SU(3) chiral perturbation theory we calculate the density-dependent complex mean field UΣ(kf ) + iWΣ(kf ) of a Σ-hyperon in isospin-symmetric nuclear matter. The leading long-range ΣN -interaction arises from one-kaon exchange and from two-pion exchange with a Σor a Λ-hyperon in the intermediate state. We find from the ΣN → ΛN conversion process at nuclear matter saturation density ρ0 = 0...

*-σ-biderivations on *-rings

Bresar in 1993 proved that each biderivation on a noncommutative prime ring is a multiple of a commutatot. A result of it is a characterization of commuting additive mappings, because each commuting additive map give rise to a biderivation. Then in 1995, he investigated biderivations, generalized biderivations and sigma-biderivations on a prime ring and generalized the results of derivations fo...

σ-Normality of Topological Spaces

QCD sum rules for Σ hyperons in nuclear matter

Within finite-density QCD sum-rule approach we investigate the self-energies of Σ hyperons propagating in nuclear matter from a correlator of Σ interpolating fields evaluated in the nuclear matter ground state. We find that the Lorentz vector self-energy of the Σ is similar to the nucleon vector selfenergy. The magnitude of Lorentz scalar self-energy of the Σ is also close to the corresponding ...