Using Low Energy Atmospheric Neutrinos for Precision Measurement of the Mixing Parameters
- Virginia Tech.
- Fermilab
- Tokyo U., ICRR
Use of low energy atmospheric neutrinos is considered for precision measurement of neutrino mixing parameters. At around energy $$E \simeq$$ a few $$\times$$100 MeV and baseline $$L$$ of a few $$\times$$1000 km, CP phase effect is $$\sim$$10 times larger than that of the conventional LBL accelerator neutrino experiments. We report here a few progresses: (1) To analyze physics in the region, a new perturbative framework at around the solar-scale enhancement is developed. (2) To know the characteristic features of CP $$\delta$$ dependence of the atmospheric neutrinos at low energies, we plot the ratio of the $$\nu_{e}$$ and $$\bar{\nu}_{e}$$ fluxes $$F(\delta)/F(\delta=0)$$ for $$\delta=\pm \frac{\pi}{2}$$ and $$\pi$$ as a function of $$E$$ using the Honda {\it et al.} flux. Interestingly, it shows $$\delta$ dependence of $$\simeq$$5-10\% level, with positive (negative) sign for $$\nu_{e}$$ ($$\bar{\nu}_{e}$$). (3) To reduce the flux systematic errors, measurement of muon energy distribution around $$\sim$$1 GeV at high altitude may be useful. Water Cherenkov or muon range detectors may be the options with advantage in the latter if it is magnetized in view of the $$\delta$$ dependence of the flux.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1581417
- Report Number(s):
- arXiv:1911.10057; FERMILAB-CONF-19-601-T; oai:inspirehep.net:1766641
- Resource Relation:
- Conference: 21st International Workshop on Neutrinos from Accelerators, Daegu, Korea, 08/26-08/31/2019
- Country of Publication:
- United States
- Language:
- English
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