Abstract
The NA48 experiment at CERN has performed a new measurement of direct CP violation, based on data taken in 1997 by simultaneously collecting K L and K S decays into π 0 π 0 and π + π −. The result for the CP violating parameter Re (ε ′/ε) is (18.5±4.5(stat)±5.8(syst))×10 −4.
Highlights
CP violation has been observed so far only in the decays of neutral kaons w1x
The NA48 experiment at CERN has performed a new measurement of direct CP violation
KS decays into p 0p
Summary
Dipartimento di Fisica dell’UniÕersitae Sezione dell’INFN di Cagliari, I-09100 Cagliari, Italy. R.W. Moore 2, K.N. Moore 2, D.J. Munday, M.D. Needham 3, M.A. Parker, S.F. Takach 4, T.O. White, S.A. Wotton. Dipartimento di Fisica dell’UniÕersitae Sezione dell’INFN di Ferrara, I-44100 Ferrara, Italy. Dipartimento di Fisica dell’UniÕersitae Sezione dell’INFN di Firenze, I-50125 Firenze, Italy. Dipartimento di Fisica dell’UniÕersitae Sezione dell’INFN di Perugia, I-06100 Perugia, Italy. Dipartimento di Fisica dell’UniÕersita, Scuola Normale Superiore e Sezione dell’INFN di Pisa, I-56100 Pisa, Italy. Dipartimento di Fisica Sperimentale dell’UniÕersitae Sezione dell’INFN di Torino, I-10125 Torino, Italy. Soltan Institute for Nuclear Studies, Laboratory for High Energy Physics, PL-00-681 Warsaw, Poland 21. Osterreichische Akademie der Wissenschaften, Institut fur Hochenergiephysik, A-1050 Wien, Austria 22
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