Search for non-Standard Model Physics using the TREK Detector at J-PARC

使用 J-PARC 的 TREK 探测器搜索非标准模型物理

• 批准号: SAPPJ-2015-00035
• 负责人: Hasinoff, Michael
• 金额: $ 7.29万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=591573
• 关键词: Search; non; Standard; Model; Physics

The study of high-precision electroweak measurements has long been used as a stringent test of Standard Model (SM) predictions and any deviations from these predictions will indicate new physics. The semi-leptonic kaon decay, K+ --> lepton + neutrino (K_l2), is one of the best channels to perform such tests since lepton universality is one of the basic assumptions in the SM. By measuring the branching ratio of the electric (Ke2) and muonic (Kµ2) decay modes the hadronic form factor in Kl2 decay cancels out, and the helicity suppression in Ke2 greatly enhances the sensitivity to new physics. Our proposed stopped K+ decay experiment aims to obtain a factor of two improvement in the combined systematic and statistical uncertainty; this will allow us to test a recent prediction based on SUSY neutrino mixing. The muon background in the positron spectrum is expected to be considerably lower than in the CERN NA62 experiment.

高精度电弱测量的研究长期以来一直被用作标准模型（SM）预测的严格测试，任何偏离这些预测的情况都将表明新的物理学。轻子普适性是标准模型的基本假设之一，因此，半轻子K ~+ →轻子+中微子（K_12）衰变是进行这类实验的最佳途径之一。通过测量电（Ke 2）和μ子（Kµ2）衰变模式的分支比，Kl 2衰变中的强子形状因子被抵消，而Ke 2中的螺旋度抑制大大提高了对新物理的敏感性。我们提出的停止K+衰变实验的目的是获得两个因素的改善相结合的系统和统计的不确定性，这将使我们能够测试最近的预测的基础上超对称中微子混合。正电子谱中的μ子背景预计将大大低于CERN NA 62实验。