Search for direct CP-violation in K+- --> pi+-pi0pi0 decays

Abstract

A search for direct CP-violation in K+- --> pi+-pi0pi0 decays based on 47.14 million events has been performed by the NA48/2 experiment at the CERN SPS. The asymmetry in the Dalitz plot linear slopes A_g=(g^+ - g^-)/(g^+ + g^-) is measured to be A_g=(1.8 +- 2.6).10^{-4}. The design of the experiment and the method of analysis provide good control of instrumental charge asymmetries in this measurement. The precision of the result is limited by statistics and is almost one order of magnitude better than that of previous measurements by other experiments.

14 pages

References in corpus (7)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Direct CP Violating Asymmetry in B0 -> K+pi- Decays
• Observation of a cusp-like structure in the pizero-pizero invariant mass distribution from K+- ==> pi+- pizero pizero decay and determination of the pi-pi scattering lengths
• Observation of Large CP Violation and Evidence for Direct CP Violation in B0-->pi+pi- Decays
• Search for direct CP violation in the decays K\pm \to 3π\pm
• Measurements of the Charge Asymmetry of the Dalitz Plot Parameters for $K^{\pm }\to {\pi }^{\pm }{\pi }^0{\pi }^0$ Decays
• On CP-Odd Effects in K_L \to 2πand K^{\pm} \to π^{\pm} π^{\pm} π^{\mp} Decays Generated by Direct CP Violation

Cited by in corpus (4)

• Search for direct CP violating charge asymmetries in $K^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$ and $K^{\pm }\to {\pi }^{\pm }{\pi }^0{\pi }^0$ decays
• Determination of the S-wave pi pi scattering lengths from a study of K+- -> pi+- pi0 pi0 decays
• Dispersive construction of two-loop $P\to \pi \pi \pi$ $(P=K,\eta )$ amplitudes
• Empirical parameterization of the K+- -> pi+- pi0 pi0 decay Dalitz plot