INTENSE NEUTRINO BEAMS AND LEPTONIC CP VIOLATION. Page: 3 of 9
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Intense Neutrino Beams and Leptonic CP Violation
William J. Marciano and Zohreh Parsa
Brookhaven National Laboratory'Upton, New York 11973
E-mail: marcianofbnl.gov, parsaebnl.gov
Abstract. Effects of the Leptonic CP violating phase, 6, on 3 generation neutrino oscillation
rates and asymmetries are discussed. A figure of merit argument is used to show that our
ability to measure the phase 5 is rather insensitive to the value of 013 (for sin2 2013 Z 0.01) as
well as the detector distance (for very long oscillation baselines). Using a study of v, -+ V,
oscillations for BNL-Homestake (2540 km) we show that a conventional horn focused wide band
neutrino beam generated by an intense 1-2 MW proton source combined with a very large water
Cherenkov detector (250-500 kton) should be able to determine 6 to about 15* in 5 x 107sec.
of running. In addition, such an effort would also measure the other oscillation parameters (9g,
Am?,) with high precision. Similar findings apply to a Fermilab-Homestake (1280 km) baseline.
We also briefly discuss features of Superbeams, Neutrino Factories and Beta-Beams.
1. Status Of 3 Generation Lepton Mixing
The known weak interaction states Ivi>, = e, A, T produced in charged current interactions
are related to the neutrino mass eigenstates lvi >, i = 1, 2, 3 with masses mi by the 3 x 3 unitary
IV, > i>
I V" > = IV2 > )
IV, > u3 >
C12C13 812C13 813e~
U = -12C23 - C12823813e C12C23 - 812523813e M 23C13
812823 - C12c23813ed -C12823 - 812C2313e 0 C23C13
cij = cos ij , sj = sin Oij
(Our phase convention differs in sign from the PDG, but is more consistent with VCKM).
Studies of atmospheric, K2K and recent MINOS v1, -+ v, disappearance indicate
2= - = 2.6(3) x 103eV2 (2a)
sin2 2023 ~ 1.0 023 ~ 45 5' (2b)
This work is supported by the U.S. Department of Energy under contract number DE-AC02-98-CH-10886.
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MARCIANO, W. & PARSA, Z. INTENSE NEUTRINO BEAMS AND LEPTONIC CP VIOLATION., article, June 13, 2006; [Upton, New York]. (https://digital.library.unt.edu/ark:/67531/metadc881943/m1/3/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.