Precise measurements of direct CP violation, CPT symmetry, and other parameters in the neutral kaon system

E. Abouzaid et al.
Phys. Rev. D 83, 092001 – Published 5 May 2011

Abstract

We present precise tests of CP and CPT symmetry based on the full data set of Kππ decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This data set contains 16×106 Kπ0π0 and 69×106 Kπ+π decays. We measure the direct CP violation parameter Re(ϵ/ϵ)=(19.2±2.1)×104. We find the KLKS mass difference Δm=(5270±12)×106s1 and the KS lifetime τS=(89.62±0.05)×1012s. We also measure several parameters that test CPT invariance. We find the difference between the phase of the indirect CP violation parameter ϵ and the superweak phase: ϕϵϕSW=(0.40±0.56)°. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for Kπ+π (ϕ+) and for Kπ0π0 (ϕ00): Δϕ=(0.30±0.35)°. From these phase measurements, we place a limit on the mass difference between K0 and K¯0: ΔM<4.8×1019GeV/c2 at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
23 More
  • Received 5 November 2010

DOI:https://doi.org/10.1103/PhysRevD.83.092001

© 2011 American Physical Society

Authors & Affiliations

Click to Expand

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 83, Iss. 9 — 1 May 2011

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×