A precise measurement of the direct CP violation parameter $\mathrm{Re}(\varepsilon'/\varepsilon)$

A. Lai et al.,D. Marras,A. Bevan,C. Lazzeroni,E. Olaiya,G. Barr,G. Bocquet,A. Ceccucci,D. Cundy,N. Doble,V. Falaleev,W. Funk,L. Gatignon, A. Gonidec, B. Gorini,G. Govi,W. Kubischta,A. Lacourt,M. Lenti,S. Luitz, I. Mikulec,A. Norton,S. Palestini,B. Panzer-Steindel,D. Schinzel,G. Tatishvili,H. Taureg, M. Velasco,O. Vossnack,H. Wahl,C. Cheshkov, A. Gaponenko,P. Hristov,V. Kekelidze,D. Madigojine,N. Molokanova,A. Tkatchev, A. Zinchenko,Russian Federation

EUROPEAN PHYSICAL JOURNAL C（2001）

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摘要

The direct CP violation parameter Re(epsilon'/epsilon) 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 K-L --> pi(o)pi(o) events collected during the 1998 and 1909 running periods, a result of Re(epsilon'/epsilon) (15.0 +/- 2.7) x 10(-4) has been obtained. The result combined with the published 1997 sample is Re(epsilon'/epsilon) (15.3 +/- 2.6) x 10(-4).

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