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

By E. Abouzaid, M. Arenton, A. Barker, M. Barrio, L. Bellantoni, E. Blucher, G. Bock, C. Bown, E. Cheu, R. Coleman and 48 more. 2003

168 citations recorded by the source corpus.

The authors present precision measurements of the direct CP violation parameter, Re({epsilon}{prime}/{epsilon}), the kaon parameters, {Delta}m and {tau}{sub S}, and the CPT tests, {phi}{sub {+-}} and {Delta}{phi}, in neutral kaon decays. These results are based on the full dataset collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This dataset contains {approx} 15 million K {yields} {pi}{sup 0}{pi}{sup 0} decays and {approx} 69 million K {yields} {pi}{sup +}{pi}{sup -} decays. They describe significant improvements to the precision of these measurements relative to previous KTeV analyses. They find Re({epsilon}{prime}/{epsilon}) = [19.2 {+-} 1.1(stat) {+-} 1.8(syst)] x 10{sup -4}, {Delta}m = (5265 {+-} 10) x 10{sup 6} hs{sup -1}, and {tau}{sub S} = (89.62 {+-} 0.05) x 10{sup -12} s. They measure {phi}{sub {+-}} = (44.09 {+-} 1.00){sup o} and {Delta}{phi} = (0.29 {+-} 0.31){sup o}; these results are consistent with CPT symmetry.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1228e26dfe71de176f148c274648d438095e8886

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In Nuclear and High Energy Physics

Citations in the corpus

Patterns of flavour violation in models with vector-like quarks (2016, methodology): “(67) This result differs by 2.9σ from the experimental world average from the NA48 [42] and KTeV [43,44] collaborations, (ε′/ε)exp = (16.6± 2.3)× 10−4, (68) suggesting that models providing enhancement of ε′/ε are favoured.”
On the importance of NNLO QCD and isospin-breaking corrections in $$\varepsilon '/\varepsilon $$ (2019, background): “This is by one order of magnitude below the experimental world average from NA48 [8] and KTeV [9,10] collaborations, (ε′/ε)exp = (16.6± 2.3)× 10−4 .”