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

Journal Article · Sun May 01 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.092001· OSTI ID:21541571

Abouzaid, E; Barrio, M; Blucher, E; Bown, C; Glazov, A; Graham, J; Kessler, R; Monnier, E; Prasad, V; Roodman, A; Shawhan, P S; Solomey, N; Wah, Y W; Winstein, B; Winston, R; Worcester, E T ^[1]; Arenton, M; Cox, B; Golossanov, A; Ledovskoy, A ^[2]

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1. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)
2. Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)

We present precise tests of CP and CPT symmetry based on the full data set of K{yields}{pi}{pi} decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This data set contains 16x10{sup 6} K{yields}{pi}{sup 0}{pi}{sup 0} and 69x10{sup 6} K{yields}{pi}{sup +}{pi}{sup -} decays. We measure the direct CP violation parameter Re({epsilon}{sup '}/{epsilon})=(19.2{+-}2.1)x10{sup -4}. We find the K{sub L}-K{sub S} mass difference {Delta}m=(5270{+-}12)x10{sup 6}({h_bar}/2{pi}) s{sup -1} and the K{sub S} lifetime {tau}{sub S}=(89.62{+-}0.05)x10{sup -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}{sub {epsilon}{sup -}}{phi}{sub SW}=(0.40{+-}0.56) deg. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K{yields}{pi}{sup +}{pi}{sup -} ({phi}{sub +-}) and for K{yields}{pi}{sup 0}{pi}{sup 0} ({phi}{sub 00}): {Delta}{phi}=(0.30{+-}0.35) deg. From these phase measurements, we place a limit on the mass difference between K{sup 0} and {bar K}{sup 0}: {Delta}M<4.8x10{sup -19} GeV/c{sup 2} at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry.

• OSTI ID: 21541571
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
AMPLITUDES
BOSONS
CP INVARIANCE
CPT THEOREM
CYCLIC ACCELERATORS
DECAY
DECAY AMPLITUDES
ELEMENTARY PARTICLES
FERMILAB ACCELERATOR
FERMILAB TEVATRON
HADRONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
LIFETIME
MASS DIFFERENCE
MESONS
PARTICLE DECAY
PARTICLE PROPERTIES
PIONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
SYMMETRY
SYNCHROTRONS
TRANSITION AMPLITUDES