On the electron–positron energy asymmetry in KL→π0e+e−

2003/12/31 by Dao-Neng Gao · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-lat #hep-ph

paper · pdf · doi:10.1016/j.physletb.2004.02.026

published as Phys.Lett. B586 (2004) 307-313 · 11 pages, 4 figures. Two figures added to show the sensitivity of the asymmetry to a_S and a_V, and some discussions added. To appear in Phys. Lett. B

arxiv created 2004/02/14 · openalex publication_date 2004/03/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Motivated by some new experimental and theoretical efforts, we update the theoretical analysis of the electron-positron energy asymmetry, which arises, in K_L --> pi0 e+ e-, from the two-photon intermediate state in the standard model. It is found that the measurement of this asymmetry in future experiments may increase our understanding of the K_{L, S} --> pi0 e+ e- decays, which would thus provide some useful information on quark flavor physics. Meanwhile, in the standard model the electron-positron energy asymmetry in the decay of K_S --> pi0 e+ e- is expected to be vanishingly small, therefore the asymmetry in K_S --> pi0 e+ e- might be a very interesting quantity to explore new physics scenarios.

Citations

• Review of particle properties
• Review of Particle Physics

Cited by

• KL→π0e+e−andKL→π0μ+μ−: a binary star on the stage of flavor physics

Related

• Charge asymmetry in the process e⁺e^-→ π⁺π^-π⁰γ
• CP- and T-Violation in the Decay K_L -> pi+ pi- e+ e- and Related Processes
• CP and T Violation in KL -> pi⁺pi^-e⁺e^-
• New Rare Decay Results from KTeV
• Forward-backward asymmetry in e⁺e^- annihilation into pions or kaons revisited