A new measurement of the ±π±γγ decay at the NA48/2 experiment

NA48/2 collaboration

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The NA48/2 experiment at CERN collected two data samples with minimum bias trigger conditions in 2003 and 2004. A measurement of the rate and dynamic properties of the rare decay K±→π±γγ from these data sets based on 149 decay candidates with an estimated background of 15.5±0.7 events is reported. The model-independent branching ratio in the kinematic range z=(mγγ/mK)2>0.2 is measured to be BMI(z>0.2)=(0.877±0.089)×10−6, and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be B(Kπγγ)=(0.910±0.075)×10−6.
Original languageEnglish
Pages (from-to)141-148
JournalPhysics Letters B
Early online date23 Jan 2014
Publication statusPublished - 1 Mar 2014

Bibliographical note

A revised version accepted for publication by Physics Letters B


  • hep-ex


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