A Precision measurement of direct CP violation in the decay of neutral kaons into two pions

By Jacqueline Batley, et al, N. collaboration. 2002

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Abstract The direct CP violation parameter Re(ϵ′/ϵ) has been measured from the decay rates of neutral kaons into two pions using the NA48 detector at the CERN SPS. The 2001 running period was devoted to collecting additional data under varied conditions compared to earlier years (1997–1999). The new data yield the result: Re(ϵ′/ϵ)=(13.7±3.1)×10−4. Combining this result with that published from the 1997, 98 and 99 data, an overall value of Re(ϵ′/ϵ)=(14.7±2.2)×10−4 is obtained from the NA48 experiment.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/621edf0d356ab17167c32a8cc638bf83a369951f

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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 .”
• Improved anatomy of ε′/ε in the Standard Model (2015, background): “3)×10−4 (average of NA48 [26] and KTeV [27,28]), we observe a discrepancy of 2.”
• Flavor Physics in the Quark Sector (2009, methodology): “NA48 does not provide such an average, so we calculate it for inclusion in the fit.”
• Kaon Decays in the Standard Model (2011, unknown): “The present experimental world average (Abouzaid et al., 2011a; Alavi-Harati et al., 1999, 2003a; Barr et al., 1993; Batley et al., 2002; Burkhardt et al., 1988; Fanti et al., 1999; Gibbons et al., 1993; Lai et al., 2001), Re ( ′/ ) = 1 3 ( 1− ∣∣∣∣ η00η +− ∣∣∣∣) = (16.8± 1.4)× 10−4 ,…”