The CP-violating asymmetry in η\toπ^+ π^- e^+e^-

Abstract

We study the CP-violating asymmetry {\cal A}_{\rm CP}, which arises, in η\toπ^+π^- e^+e^-, from the angular correlation of the e^+ e^- and π^+π^- planes due to the interference between the magnetic and electric decay amplitudes. With the phenomenologically determined magnetic amplitude and branching ratio as input, the asymmetry, induced by the electric bremsstrahlung amplitude through the CP-violating decay η\toπ^+π^-, and by an unconventional tensor type operator, has been estimated respectively. The upper bound of {\cal A}_{\rm CP} from the former is about 10^{-3}, and the asymmetry from the latter might be up to O(10^{-2}). One can therefore expect that this CP asymmetry would be an interesting CP-violating observable for the future precise measurements in the ηfactories.

LaTeX, 6 pages. One reference corrected, and some new references added

References in corpus (5)

• Observation of Large CP Violation in the Neutral B Meson System
• Observation of CP violation in the B^0 meson system
• Study of conversion decays phi->etae+e-, eta->e+e-g and eta->pi+pi-e+e- at CMD-2
• CP Violation in the Decay $\eta \to {\pi }^{+}{\pi }^{-}\gamma$
• The CP-violating asymmetry in K_L -> pi+ pi- e+ e-

Cited by in corpus (13)

• Physics with the KLOE-2 experiment at the upgraded DA$\varphi$NE
• Precision tests of fundamental physics with $\eta$ and ${\eta }^{\prime }$ mesons
• Measurement of the branching ratio and search for a CP violating asymmetry in the eta -> pi+pi-e+e-(gamma) decay at KLOE
• Measurement of the eta->pi+pi-e+e- decay branching ratio
• Measurements of Branching Ratios for $\eta$ Decays into Charged Particles
• $\eta$ and ${\eta }^{\prime }$ Physics at BES-III
• An overview of $\eta$ and ${\eta }^{\prime }$ decays at BESIII
• Tests of the fundamental symmetries in eta meson decays
• Measurement of the Branching Fraction of and Search for a CP-Violating Asymmetry in ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ at BESIII
• $CP$ violation in ${\eta }^{(\prime )}\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ decays
• Study of $\eta$-meson Decays at KLOE/KLOE-2
• ${\eta }^{{(}^{\prime })}\to {\pi }^{+}{\pi }^{-}{\gamma }^{(\ast )}$ in large-$N_c$ chiral perturbation theory
• Study of $\eta \to {\pi }^{+}{\pi }^{-}{l}^{+}{l}^{-}$