K→ππand a light scalar meson

1999/10/11 by Jacques Bloch, J. C. R. Bloch, M. A. Ivanov +5
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevc.62.025206

published as Phys.Rev.C62:025206,2000 · 7 pages, REVTEX

arxiv created 1999/10/11 · openalex publication_date 2000/07/21 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We explore the \ensuremathΔI=(1)/(2) rule and \ensuremathε^\ensuremath'/\ensuremathε in \stackrel\ensuremath→K\ensuremathπ\ensuremathπ transitions using a Dyson-Schwinger equation model. Exploiting the feature that quantum chromodynamics penguin operators direct K_S⁰ transitions through 0⁺⁺ intermediate states, we observe an enhancement of \stackrel\ensuremath→K\ensuremathπ\ensuremathπ_I=0 transitions from the contribution of a putative light \ensuremathσ-meson. This mechanism also affects \ensuremathε^\ensuremath'/\ensuremathε.

Citations

• Pseudovector components of the pion,π0→γγ,andFπ(q2)
• Selected nucleon form factors and a composite scalar diquark
• Nucleon form factors and a nonpointlike diquark