An incremental approach to unravel the neutrino mass hierarchy and CP violation with a long-baseline superbeam for large 胃13

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• 作者：Sanjib Kumar Agarwalla (1) Sanjib.Agarwalla@ific.uv.es
  Tracey Li (1) tracey.li@ific.uv.es
  Andr茅 Rubbia (2) andre.rubbia@cern.ch
• 关键词：Keywords Neutrino Physics – ; CP violation
• 刊名：Journal of High Energy Physics
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：2012
• 期：5
• 页码：DOI: 10.1007/JHEP05(
• 全文大小：1.2 MB
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• 作者单位：1. Instituto de F铆sica Corpuscular, CSIC-Universitat de Val猫ncia, Apartado de Correos 22085, E-46071 Valencia, Spain2. ETH Zurich, Institute for Particle Physics, CH-8093 Z眉rich, Switzerland
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Elementary Particles and Quantum Field Theory
  Quantum Field Theories, String Theory
  
• 出版者：Springer Berlin Heidelberg
• ISSN：1029-8479

文摘

Recent data from long-baseline neutrino oscillation experiments have provided new information on θ <sub>13sub>, hinting that 0.01 < <sub> ~ sub> \textsi\textn2 0.0{1}\mathop{ 2q<sub>13sub> < <sub> ~ sub> 0.1 {2}{\theta_{{{13}}}}\mathop{ at 2 σ confidence level. In the near future, further confirmation of this result with high significance will have a crucial impact on the optimization of the future long-baseline neutrino oscillation experiments designed to probe the neutrino mass ordering and leptonic CP violation. In this context, we expound in detail the physics reach of an experimental setup where neutrinos produced in a conventional wide-band beam facility at CERN are observed in a proposed Giant Liquid Argon detector at the Pyhasalmi mine, at a distance of 2290 km. Due to the strong matter effects and the high detection efficiency at both the first and second oscillation maxima, this particular setup would have unprecedented sensitivity to the neutrino mass ordering and leptonic CP violation in the light of the emerging hints of large θ <sub>13sub>. With a 10 to 20 kt ‘pilot’ detector and just a few years of neutrino beam running, the neutrino mass hierarchy could be determined, irrespective of the true values of δ <sub>CPsub> and the mass hierarchy, at 3 σ (5 σ) confidence level if sin2 2θ <sub>13sub>(true) = 0.05 (0.1). With the same exposure, we start to have 3 σ sensitivity to CP violation if sin2 2θ <sub>13sub>(true) > 0.05, in particular testing maximally CP-violating scenarios at a high confidence level. After optimizing the neutrino and anti-neutrino running fractions, we study the performance of the setup as a function of the exposure, identifying three milestones to have roughly 30%, 50% and 70% coverage in δ <sub> C P sub> (true) for 3 σ CP violation discovery. For comparison, we also study the CERN to Slanic baseline of 1540 km. This work nicely demonstrates that an incremental program, staged in terms of the exposure, can achieve the desired physics goals within a realistically feasible timescale, and produce significant new results at each stage.