Study of the K± → π±γγ decay by the NA62 experiment

collaboration, NA62 and Ruggiero, Giuseppe (2014) Study of the K± → π±γγ decay by the NA62 experiment. Physics Letters B, 732. pp. 65-74. ISSN 0370-2693

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Abstract

A study of the dynamics of the rare decayK±→π±γγhas been performed on a sample of 232 decaycandidates, with an estimated background of 17.4±1.1 events, collected by the NA62 experiment atCERN in 2007. The results are combined with those from a measurement conducted by the NA48/2Collaboration at CERN. The combined model-independent branching ratio in the kinematic rangez=(mγγ/mK)2>0.2isBMI(z>0.2)=(0.965±0.063)×10−6, and the combined branching ratio in the fullkinematic range assuming a Chiral Perturbation Theory description isB(Kπγγ)=(1.003±0.056)×10−6.A detailed comparison of the results with the previous measurements is performed. A study of the dynamics of the rare decayK±→π±γγhas been performed on a sample of 232 decaycandidates, with an estimated background of 17.4±1.1 events, collected by the NA62 experiment atCERN in 2007. The results are combined with those from a measurement conducted by the NA48/2Collaboration at CERN. The combined model-independent branching ratio in the kinematic rangez=(mγγ/mK)2>0.2isBMI(z>0.2)=(0.965±0.063)×10−6, and the combined branching ratio in the fullkinematic range assuming a Chiral Perturbation Theory description isB(Kπγγ)=(1.003±0.056)×10−6.A detailed comparison of the results with the previous measurements is performed.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
133612
Deposited By:
Deposited On:
21 May 2019 09:25
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Sep 2020 05:30