Long-range spatial correlation of neutrino in pion decay

Details Long-range spatial correlation of neutrino in pion decay Long-range spatial correlation of neutrino in pion decay

2011-02-03

arxiv.org/abs/1102.0644v4

Physics

High Energy Physics

High Energy Physics - Phenomenology

56 pages, 8figures. Fig.4 and Fig.8 were revised. Section 5.3 was added

Scientific paper

Position-dependent property of the neutrino produced in high-energy pion decay is studied theoretically using a wave packet formalism. It is found that the neutrino probability has a universal finite-distance correction if the pion has a long coherence length. This correction has origins in the interference of the neutrino that is caused by the small neutrino mass and a light-cone singularity of the pion and muon system. This term is positive definite and leads excess to the neutrino flux over the in-coherent value at macroscopic distance of near detector region. The flux decreases slowly with distance in a universal manner that is determined by the absolute value of the neutrino mass and energy. Absolute value of the neutrino mass is expected to be measured indirectly from the neutrino detection probability at finite distance.

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