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Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System | | KTeV Collaboration
; E. Abouzaid
; M. Arenton
; A.R. Barker
; M. Barrio
; L. Bellantoni
; E. Blucher
; G.J. Bock
; C. Bown
; E. Cheu
; R. Coleman
; M.D. Corcoran
; B. Cox
; A.R. Erwin
; C.O. Escobar
; A. Glazov
; A. Golossanov
; R.A. Gomes
; P. Gouffon
; J. Graham
; J. Hamm
; Y.B. Hsiung
; D.A. Jensen
; R. Kessler
; K. Kotera
; J. LaDue
; A. Ledovskoy
; P.L. McBride
; E. Monnier
; H. Nguyen
; R. Niclasen
; D.G. Phillips II
; V. Prasad
; X.R. Qi
; E.J. Ramberg
; R.E. Ray
; M. Ronquest
; A. Roodman
; E. Santos
; P. Shanahan
; P.S. Shawhan
; W. Slater
; D. Smith
; N. Solomey
; E.C. Swallow
; S.A. Taegar
; P.A. Toale
; R. Tschirhart
; Y.W. Wah
; J. Wang
; H.B. White
; J. Whitmore
; M. J. Wilking
; B. Winstein
; R. Winston
; E.T. Worcester
; T. Yamanaka
; E. D. Zimmerman
; R.F. Zukanovich
; | | Date: |
31 Oct 2010 | | 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 - phiSW = (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. | | Source: | arXiv, 1011.0127 | | Services: | Forum | Review | PDF | Favorites | |
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