The neutral pion form factor at NA62

7th International Conference on Beauty, Charm, and Hyperons in Hadronic Interactions

Cenci, Patrizia^1

Istituto Nazionale di Fisica Nucleare Sezione di Perugia, Via Alessandro Pascoli, Perugia

06123, Italy^1

关键词: Electromagnetic transitions;    Final state;    Form factors;    In-vacuum;    Kaon beam;    Neutral pions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/770/1/012035/pdf
DOI  :  10.1088/1742-6596/770/1/012035

来源: IOP

【 摘 要 】

In 2007 the NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger selecting events with electrons in the final state. The kaon beam represents a rich source of tagged neutral pion decays in vacuum. The electromagnetic transition form factor slope of the π0in the time-like region has been measured from about 106fully reconstructed π0Dalitz decays collected in 2007. The preliminary result a = (3.68 0.51stat0.25syst) 10-2is the most precise to date. This value is compatible with theoretical expectations and consistent with the previous measurements.