A study of the dynamics of the rare decayK ±âÏ Â±Î³Î³ has been performed on a sample of 232 decay candidates, with an estimated background of 17.4 ± 1.1 events, collected by the NA62 experiment at CERN in 2007. The results are combined with those from a measurement conducted by the NA48/2 Collaboration at CERN. The combined model-independent branching ratio in the kinematic range z=(mγγ/mK)2>0.2 is BMI(z>0.2)=(0.965±0.063)Ã10-6, and the combined branching ratio in the full kinematic range assuming a Chiral Perturbation Theory description is B(KÏγγ)=(1.003±0.056)Ã10-6. A detailed comparison of the results with the previous measurements is performed. © 2014 The Authors.
Study of the K+- -> pi+- gamma gamma decay by the NA62 experiment / Lazzeroni, C., Romano, A., Ceccucci, A., Danielsson, H., Falaleev, V., Gatignon, L., Goy Lopez, S., Hallgren, B., Maier, A., Peters, A., Piccini, M., Riedler, P., Frabetti, P.L., Gersabeck, E., Kekelidze, V., Madigozhin, D., Misheva, M., Molokanova, N., Movchan, S., Potrebenikov, Yu., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 732:(2014), pp. 65-74. [10.1016/j.physletb.2014.03.016]
Study of the K+- -> pi+- gamma gamma decay by the NA62 experiment
Bizzeti, A.;
2014
Abstract
A study of the dynamics of the rare decayK ±âÏ Â±Î³Î³ has been performed on a sample of 232 decay candidates, with an estimated background of 17.4 ± 1.1 events, collected by the NA62 experiment at CERN in 2007. The results are combined with those from a measurement conducted by the NA48/2 Collaboration at CERN. The combined model-independent branching ratio in the kinematic range z=(mγγ/mK)2>0.2 is BMI(z>0.2)=(0.965±0.063)Ã10-6, and the combined branching ratio in the full kinematic range assuming a Chiral Perturbation Theory description is B(KÏγγ)=(1.003±0.056)Ã10-6. A detailed comparison of the results with the previous measurements is performed. © 2014 The Authors.
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