A precise measurement of the direct CP violation parameter Re ( ε ′ / ε ) The NA 48

Collaboration A. Lai,Davide Marras, Timothy Gershon,Bill Hay,Cristina Lazzeroni,D. J. Munday,M. D. Needham,Michael Andrew Parker,T. O. White,Stephen Wotton,Marco Scarpa,M. Veltri,Matthias Wittgen,J. C. Chollet,Louis Fayard,Lydia Iconomidou-Fayard,Gazanfer Unal, Isabelle Wingerter-Seez, Aniello Nappi,Mauro Piccini, Sergio Giudici,Mauro Sozzi,Jérôme Chèze,M. de Beer,Flavio Marchetto, Elena Menichetti,Nadia Pastrone

semanticscholar（2001）

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摘要

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. With 3.3 million KL → π π events collected during the 1998 and 1999 running periods, a result of Re(ε′/ε) = (15.0 ± 2.7)×10 has been obtained. The result combined with the published 1997 sample is Re(ε′/ε) = (15.3 ± 2.6)×10. PACS. PACS-key describing text of that key – PACS-key describing text of that key 2 NA48 Collaboration: A precise measurement of the direct CP violation parameter Re(ε′/ε)

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