The final measurement of $ε'ε$ by NA48

Details The final measurement of $ε'ε$ by NA48 The final measurement of $ε'ε$ by NA48

2002-09-24

arxiv.org/abs/hep-ex/0209064v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 3 figures. Proceedings for the ICHEP02 conference

Scientific paper

10.1016/S0920-5632(03)90592-5

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. The 2001 running period was devoted to collecting additional data under varied conditions compared to earlier years (1997-99). The 2001 data yield the result: Re($\epsilon\epsilon'$)=$(13.7\pm3.1)\times10^{-4}$. Combining this result with that published from the 1997,98 and 99 data, an overall value of Re($\epsilon'\epsilon$)=$(14.7\pm2.2)\times10^{-4}$ is obtained from the NA48 experiment.

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