A new measurement of the decay at the NA48/2 experiment

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• 作者：The NA48/2 Collaboration J.R. Batley ; G. Kalmus ; C. Lazzeroni¹ ; ² ; D.J. Munday ; M.W. Slater¹ ; S.A. Wotton
• 刊名：Physics Letters B
• 出版年：7 March, 2014
• 年：2014
• 卷：730
• 期：Complete
• 页码：141-148
• 全文大小：327 K

文摘

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 from these data sets based on 149 decay candidates with an estimated background of events is reported. The model-independent branching ratio in the kinematic range is measured to be , and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be .