2006/05/15 by G. Lamanna, Lamanna, G.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0605052
Talk given to "Rencontres de Moriond 2006 EW" on behalf of NA48/2 collaboration
arxiv created 2006/05/15 · arxiv updated 2009/12/01
The NA48/2 result, based on the data collected during the 2003 run, on direct CP violation in K±→π±π0π0 decay is presented. The main goal of the experiment is to reach a sensitivity at level of 10-4 in the measurement of the charge asymmetry parameter Ag=(g+-g-)/(g++g-), where g is the linear slope of the Dalitz plot in the K→ 3π decay. Thanks to the simultaneous collection of the two kaon charges and to the high resolution of the main sub-detectors, the systematics uncertainties are kept under the statistical error level. The experimental procedure, the analysis technique and the main systematics are discussed to present the final result Ag=(1.8±2.6)× 10-4 This result based on more than 45⋅106 events, correspondig to one half of the whole two year data taking, is about an order of magnitude more precise with respect to the previous measurement.