Searches for Lepton Number Violation and resonances in K±→ πμμ decays at NA48/2

10th International Conference on Kaon Physics

Piccini, M.^1

INFN, Sezione di Perugia, Italy^1

关键词: Branching ratio;    Final state;    Lepton number violations;    Lepton-number-violating decay;    Upper limits;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012018/pdf
DOI  :  10.1088/1742-6596/800/1/012018

来源: IOP

【 摘 要 】

The NA48/2 experiment at CERN collected in 2003-2004 a large sample of charged kaon decays with multiple charged particles in the final state. A new upper limit on the rate of the lepton number violating decay obtained from this sample is reported. Moreover searches for two-body resonances in the K±→ πμμ, decays (including heavy neutral leptons and inflatons) in the accessible range of masses and lifetimes are presented. During the 2016 run the NA62 experiment has collected data with a dedicated trigger for kaon decays with two muons in the final state. Preliminary results on the statistics collected during a period of two weeks for the decay K+→ π+μ+μ-will be presented. The NA62 experiment has good potential for the studies of rare K+decays in addition to its main goal, the measurement of the branching ratio of the decay .