Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System

Abstract

We present precise tests of CP and CPT symmetry based on the full dataset of K to pipi decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This dataset contains 16 million K to 2pi0 and 69 million K to pi+pi- decays. We measure the direct CP violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. We find the KL-KS mass difference Deltam = (5270 pm 12)x10^6 hbar/s and the KS lifetime tauS = (89.62 pm 0.05)x10-12 s. We also measure several parameters that test CPT invariance. We find the difference between the phase of the indirect CP violation parameter, epsilon, and the superweak phase, phi_epsilon - phi_SW = (0.40 pm 0.56) degrees. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K to pi+pi- (phi+-) and for K to 2pi0 (phi00), Delta phi = (0.30 pm 0.35) degrees. From these phase measurements, we place a limit on the mass difference between K0 and K0bar, DeltaM < 4.8 x 10-19 GeV/c^2 at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry.

28 pages, 30 figures; removed extra figure

References in corpus (2)

• Detailed Study of the KL -> 3pi0 Dalitz Plot
• Epsilon'/Epsilon in the Standard Model: Theoretical Update

Cited by in corpus (33)

• 50 Years of Quantum Chromodynamics
• An ${\epsilon }^{\prime }$ improvement from right-handed currents
• Scrutinizing CKM unitarity with a new measurement of the $K_{\mu 3}/K_{\mu 2}$ branching fraction
• Physics at CERN's Antiproton Decelerator
• Experiments with K-Meson Decays
• Singularity-free Next-to-leading Order $\Delta S=1$ Renormalization Group Evolution and ${\epsilon }_K^{\prime }/{\epsilon }_K$ in the Standard Model and Beyond
• On $SU(3{)}_F$ Breaking through Final State Interactions and CP Asymmetries in $D\to PP$ Decays
• Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam
• Update on $|V_{us}|$ and $|V_{us}/V_{ud}|$ from semileptonic kaon and pion decays
• Search for Time-Dependent CPT Violation in Hadronic and Semileptonic B Decays
• Radiative corrections to semileptonic beta decays: Progress and challenges
• Kenneth Wilson and lattice QCD
• Two Higgs Bi-doublet Left-Right Model With Spontaneous P and CP Violation
• Large Strong Phases and CP Violation in the Annihilation Processes ${\bar{B}}^0\to K^{+}{K}^{-}$, $K^{\ast \pm }{K}^{\mp }$, $K^{\ast +}{K}^{\ast -}$
• $\Delta I=3/2$ and $\Delta I=1/2$ channels of $K\to \pi \pi$ decay at the physical point with periodic boundary conditions
• T Violation and CPT Tests in Neutral-Meson Systems
• Vus and lepton universality from kaon decays with the KLOE detector
• CP, T and CPT analyses in EPR - correlated $B^0{\bar{B}}^0$ decays
• Workshop summary -- Kaons@CERN 2023
• New Dipole Penguin Contribution to K --> pi pi decays
• On testing violations of Bose and $CPT$ symmetries via Dalitz plots and Dalitz `prism'
• Theoretical overview of kaon decays
• General non-leptonic $\Delta F=1$ WET at the NLO in QCD
• Kaons: Review and Outlook
• Impact of Lattice QCD on CKM Phenomenology
• The Revival of Kaon Flavour Physics
• Spontaneous CP Violation and Flavor Changing Neutral Currents in Minimal SO(10)
• Precision radiative corrections to the muon polarization in the semileptonic decay of a charged kaon
• Anomalies from Non-Perturbative Standard Model Effects
• Kaon Physics: Theory Overview
• What We've Learned from Heavy Flavour Experiments Since CKM2010
• Limit on Quark-Antiquark Mass Difference from the Neutral Kaon System
• CP, CPT and Rare Decays