FandDvalues with explicit flavor symmetry breaking andΔscontents of nucleons

2007/05/31 by T. Yamanishi, Tadashi Yamanishi · 2 citations
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.76.014006

published as Phys.Rev.D76:014006,2007 · 15 pages, 1 figure, final version to appear in PRD

openalex publication_date 2007/07/18 · arxiv created 2007/10/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We propose a new model for describing baryon semileptonic decays for estimating F and D values with explicit breaking effects of both SU(3) and SU(2) flavor symmetry, where all possible SU(3) and SU(2) breaking effects are induced from an effective interaction. An overall fit including the weak magnetism form factor yields F=0.477\ifmmode±\else\textpm\fi0.001, D=0.835\ifmmode±\else\textpm\fi0.001, V_ud=0.975\ifmmode±\else\textpm\fi0.002, and V_us=0.221\ifmmode±\else\textpm\fi0.002 with \ensuremathχ²=4.43/5 d.o.f.. The spin content of strange quarks \ensuremathΔs is estimated from the obtained values F and D, and the nucleon spin problem is reexamined. Furthermore, the unmeasured values of (g₁/f₁) and (g₁) for other hyperon semileptonic decays are predicted from this new formula.

Cited by

• Hyperon–nucleon force from lattice QCD
• Strange mass corrections to hyperonic semi-leptonic decays in statistical model

Related

• SU(3) flavor symmetry analysis of hyperon non-leptonic two body decays
• A New Quark Model Approach to Hyperon Semi-Leptonic Decays
• SU(3) Symmetry Breaking and Polarized Parton Densities
• Further remarks on electroweak moments of baryons and manifestations of broken SU(3)
• Test of SU(3) Symmetry in Hyperon Semileptonic Decays