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 decayK ±âÏ Â±Î³Î³ 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)Ã10-6, and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be B(KÏγγ)=(0.910±0.075)Ã10-6. © 2014 The Authors.
A new measurement of the K+- -> pi+- gammagamma decay at the NA48/2 experiment / Batley, J.R., Kalmus, G., Lazzeroni, C., Munday, D.J., Slater, M.W., Wotton, S.A., Arcidiacono, R., Bocquet, G., Cabibbo, N., Ceccucci, A., Cundy, D., Falaleev, V., Fidecaro, M., Gatignon, L., Gonidec, A., Kubischta, W., Norton, A., Maier, A., Patel, M., Peters, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 730:(2014), pp. 141-148. [10.1016/j.physletb.2014.01.038]
A new measurement of the K+- -> pi+- gammagamma decay at the NA48/2 experiment
Bizzeti, A.;
2014
Abstract
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 decayK ±âÏ Â±Î³Î³ 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)Ã10-6, and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be B(KÏγγ)=(0.910±0.075)Ã10-6. © 2014 The Authors.| File | Dimensione | Formato | |
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