Prospects for an experiment to measure at the CERN SPS

10th International Conference on Kaon Physics

Moulson, M.^1

INFN, Laboratori Nazionali di Frascati, Frascati RM

00044, Italy^1

关键词: Branching ratio;    CKM unitarity;    Decay products;    Design challenges;    Feasibility studies;    Neutral beams;    Photon veto detector;    Precise measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012037/pdf
DOI  :  10.1088/1742-6596/800/1/012037

来源: IOP

【 摘 要 】

Precise measurements of the branching ratios for the K → πv v decays can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, K+→ π+v v and K0L→ π0v v, since different new physics models a-ect the rates for each channel differently. We are investigating the feasibility of performing a measurement of BR(K0L→ π0v v) using a high-energy secondary neutral beam at the CERN SPS in a successor experiment to NA62. The planned experiment would reuse some of the NA62 infrastructure, including possibly the NA48 liquid-krypton calorimeter. The mean momentum of K0Lmesons decaying in the fiducial volume is 70 GeV; the decay products are boosted forward, so that less demanding performance is required from the large-angle photon veto detectors. On the other hand, the layout poses particular challenges for the design of the small-angle vetoes, which must reject photons from K0Ldecays escaping through the beam pipe amidst an intense background from soft photons and neutrons in the beam. We present some preliminary conclusions from our feasibility studies, summarizing the design challenges faced and the sensitivity obtainable for the measurement of BR(K0L→ π0v v).