2016/11/15 by M. Moulson, Moulson, M.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det) #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1611.04864
6 pages, 5 figures. Prepared for the proceedings of the 2016 International Conference on Kaon Physics (KAON 2016), Birmingham, UK, 14-17 September 2016
arxiv created 2016/11/15 · openalex publication_date 2016/11/15 · arxiv updated 2016/11/16 · openalex created_date 2017/01/26 · openalex updated_date 2026/07/28
Precise measurements of the branching ratios for the K→πνν decays can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, K+→π+νν and KL→π0νν, since different new physics models affect the rates for each channel differently. We are investigating the feasibility of performing a measurement of BR(KL→π0νν) 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 KL mesons 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 KL decays 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(KL→π0νν).