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SUMMARY:Probing non perturbative QCD with kaon decays: precise results by 
 NA48/2
DTSTART;VALUE=DATE-TIME:20090421T143000Z
DTEND;VALUE=DATE-TIME:20090421T160000Z
DTSTAMP;VALUE=DATE-TIME:20130520T092131Z
UID:indico-event-52436@cern.ch
DESCRIPTION:The NA48/2 experiment at the CERN SPS has accumulated a total 
 sample of several billions K± decays in 2003-2004. Primarily setup to sea
 rch for direct CP violation charge asymmetries in K to 3π decays (K± →
  π± π0 π0 and K± → π± π+ π-)\, the experiment has also collecte
 d unprecedented statistics of rare decay modes. \nThe analyses of ~60 mill
 ions K± → π± π0 π0 (K3π) decays and more than 1 million K± →  
 π+ π- e±V  (Ke4) decays give independent but complementary approaches t
 o the study of low energy ππ scattering very close to threshold. \nPreci
 se values of a0 and a2\, the Isospin 0 and 2 S-wave ππ scattering length
 s\, are extracted with an experimental uncertainty of few percents\, allow
 ing accurate tests of Chiral Perturbation Theory predictions. These analys
 es determine simultaneously the form factors (Ke4) and Dalitz plot paramet
 ers (K3π) with such good precision to reveal evidence for new genuine ter
 ms needed to accurately describe the transition amplitudes.\nA very fruitf
 ul collaboration was developed with several theory groups to bring the con
 trol of the theoretical predictions at a level similar to the achieved exp
 erimental precision.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=
 52436
LOCATION:CERN Main Auditorium **
URL:http://indico.cern.ch/conferenceDisplay.py?confId=52436
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