Recent results of the NA48/2 experiment

Details Recent results of the NA48/2 experiment Recent results of the NA48/2 experiment

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..899..205m&link_type=abstract

SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP Conference Proceedings, Volume 899, pp. 205-206 (2007).

Other

Decays Of K Mesons, Decays Of K Mesons, Pi, K, And Eta Mesons, Charge Conjugation, Parity, Time Reversal, And Other Discrete Symmetries

Scientific paper

The main goals of the NA48/2 experiment are a search for direct CP - violation in the charged kaon decays, a measurement of the pion scattering lengths using Ke4 decays and an investigation of some rare decays. By using large samples of K+/- --> π+/-π+π- and K+/- --> π+/-π0π0 decays, the asymmetries in the linear Dalitz plot slopes Ag = (g+ - g-)/(g+ + g-) were measured with high accuracy for both decay modes. The design of the experiment and the method of analysis provide good control of instrumental charge asymmetries in this measurement. Investigating the two neutral pion effective mass distribution in the K+/- --> π+/-π0π0 decays, we observed cusp-like anomaly. This anomaly, never observed before, can be interpreted as an effect due to the final state charge exchange process π+π- --> π0π0 in the K+/- --> π+/-π+π- decay. Comparison with theoretical models allowed to obtain a measurement of the pion-pion scattering length with a new technique which has a high precision.

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