This is a mature, well developed, world class experiment whose relevance, importance, and probability of unearthing critical and exciting physics has increased with time. We review the ongoing effort in the US, Japan, and Europe of the scientific community to study the location and the detector performance of the next-generation long-baseline neutrino facility. More than 500 people from 90 institutions, including 139. Scientists will shoot a beam of neutrinos through the earth from Fermilab in Batavia, Ill., 800 miles to a target at the Sanford Underground Research Facility. The facilities envisioned are expected to enable many other science opportunities due to the high event rates and excellent detector resolution from beam neutrinos in the near detector and atmospheric neutrinos in the far detector. The discovery of neutrino oscillation led to many new research experiments, including a long baseline neutrino experiment at LBNF. To fulfill these and other goals as a world-class facility, LBNE is conceived around four central components: (1) a new, intense wide-band neutrino source at Fermilab, (2) a fine-grained `near' neutrino detector just downstream of the source, (3) the Sanford Underground Research Facility (SURF) in Lead, South Dakota at an optimal distance (~1300 km) from the neutrino source, and (4) a massive liquid argon time-projection chamber (LArTPC) deployed there as a 'far' detector. Subjects: Instrumentation and Detectors (physics. Illinois, and Sanford Underground Research Facility, Lead, South Dakota. Chief among the discovery opportunities are observation of CP symmetry violation in neutrino mixing, resolution of the neutrino mass hierarchy, determination of maximal or near-maximal mixing in neutrinos, searches for nucleon decay signatures, and detailed studies of neutrino bursts from galactic supernovae. Abstract: The Physics Program for the Deep Underground Neutrino Experiment (DUNE) at the Fermilab Long-Baseline Neutrino Facility (LBNF) is described. the Long Baseline Neutrino Facility and Deep Underground Neutrino Experiment. On July 21, one mile beneath Lead, South Dakota, construction began on the first international mega-science experiment ever hosted on U.S. LBNE has been developed to provide a unique and compelling program for the exploration of key questions at the forefront of particle physics. In this document, we describe the wealth of science opportunities and capabilities of LBNE, the Long-Baseline Neutrino Experiment.
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