# A precise measurement of the direct CP violation parameter $Re(\epsilon\prime/\epsilon)$

Abstract : 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 KL->pi0pi0 events collected during the 1998 and 1999 running periods, a result of Re(epsilon'/epsilon) = (15.0 +- 2.7)x10-4 has been obtained. The result combined with the published 1997 sample is Re(epsilon'/epsilon) = (15.3 +- 2.6)x10-4.
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http://hal.in2p3.fr/in2p3-00011172
Contributor : Hélène Kerec <>
Submitted on : Friday, February 1, 2002 - 11:42:01 AM
Last modification on : Saturday, January 2, 2021 - 11:26:02 PM

### Citation

A. Lai, J.C. Chollet, S. Crepe, L. Fayard, L. Iconomidou-Fayard, et al.. A precise measurement of the direct CP violation parameter $Re(\epsilon\prime/\epsilon)$. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2001, 22, pp.231-254. ⟨in2p3-00011172⟩

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