Hyper-Kamiokande (UK Strategy for Long Baseline Neutrino Oscillation Experiments)

英国处于基于加速器的中微子振荡物理学的前沿，并准备在多用途、精确的超神冈实验中发挥突出作用，该实验为在轻子领域发现CP破坏提供了前所未有的潜力。人们普遍认为，轻子扇区中CP违逆的发现对粒子物理学的进步至关重要，因为它暗示了轻子扇区对宇宙中物质-反物质不对称有重大贡献的令人兴奋的可能性。该实验还将通过显着提高中微子振荡参数的精度和处理简并（例如，theta23八分域），提供急需的关键中微子振荡参数信息。超级神冈实验是成功的T2K实验的升级或第二阶段，在T2K实验中，英国在最近对电子中微子外观的观察中发挥了主导作用，并且是主要参与者。Rev. Lett. 112, 061802(2014))。一个升级的多兆瓦波束，一个25倍大的远探测器和一套升级的近探测器，一个潜在的2公里探测器，是新实验的特点。超神冈探测器（HK）是下一代多用途的地下水切伦科夫探测器，它将提供超灵敏度，这对观测cp违和至关重要，也极大地扩展了对质子衰变的搜索，允许对大气中微子进行详细研究（允许测量中微子质量层次），以及对来自天文起源的中微子进行研究。太阳中微子的精确测量，太阳耀斑的观测，中微子地球物理学也包括在实验的庞大物理组合中。超级神冈实验是日本粒子物理学和天体物理学项目的核心。这是一个强有力的国际承诺，英国正在领导欧盟的努力。这样一个高精度的实验需要在许多领域进行创新。英国的努力目标是利用现有专业知识的战略领域，并确保在实验中发挥突出作用，保证充分利用实验的物理潜力。

The UK is at the forefront of accelerator-based neutrino oscillation physics and is poised to play a prominent role in the multi-purpose, precision Hyper-Kamiokande experiment that offers unprecedented potential for the discovery of CP violation in the leptonic sector. It is universally agreed that the discovery of CP violation in the leptonic sector is critical to progress in particle physics, as it implies the exciting possibility that the lepton sector significantly contributes to the matter-antimatter asymmetry in the Universe. The experiment will also provide much needed information on key neutrino oscillation parameters by significantly increasing their precision and addressing degeneracies (e.g. the theta23 octant). Hyper-Kamioka is the upgrade, or phase II, of the successful T2K experiment in which the UK has a leading role and was a major player in the recent observation of the electron neutrino appearance (Phys. Rev. Lett. 112, 061802 (2014)). An upgraded multi-MW beam, a 25 times larger far-detector and an upgraded suite of near detectors, with a potential 2km detector, characterize the new experiment. The far detector, Hyper-Kamiokande (HK), is a next generation, multi-purpose, underground Water Cherenkov detector that will provide hyper-sensitivity that is crucial for the observation of CP-violation as well as greatly extending the search for proton decays, allowing a detailed study of atmospheric neutrinos (permitting the measurement of the neutrino mass hierarchy), and studies of neutrinos from astronomical origins. Precision measurements of solar neutrinos, observation of solar flares, neutrino geophysics are also included in the vast physics portfolio of the experiment.The Hyper-Kamiokande experiment is central to the particle physics and astrophysics programme in Japan,. There is a strong international commitment and the UK is leading the EU effort.Such a high precision experiment will require innovation in many areas. The UK effort is targeting strategic areas that exploit current expertise and ensure prominent roles within the experiment guaranteeing full exploitation of the physics potential of the experiment.