Probing CP violation at LBNE with reactor experiments

Abstract

In this work, we have explored the possibilities of improving CP violation discovery potential of newly planned Long-Baseline Neutrino Experiment (LBNE), U.S.A., by combining with data from reactors. The third mixing angle $\theta_{13}$ is now very precisely measured and this precise measurenent of $\theta_{13}$ helps in measurement of CP violation. Here, CP violation is studied with and without data from reactors. Impact of placing a ND is also studied. It is found that CPV discovery potential of LBNE with ND increases when combined with data from reactors. With a far detector of 35 kt, it is possible to obtain 5$\sigma$ sensitivity of CPV when run for 5 years in $\nu$ and 5 years in $\bar{\nu}$ mode. When hierarchy is assumed to be normal hierarchy, CPV sensitivity is maximum. CPV discovery is possible by combining 5 years neutino data from LBNE with 3 years anti-neutrino from reactors. This study reveals that CPV can also be discovered at 5$\sigma$ cl in IH mode when appearance measurement of LBNE is combined with reactors

Octant Degeneracy and Quadrant of Leptonic CPV Phase at Long BaselineνExperiments and Baryogenesis

“…We considered both appearance (ν µ → ν e ) and disappearance (ν µ → ν e ) channels in both neutrino and antineutrino modes. Some of the observations made in [4] are 1. CPV discovery potential of LBNE increases significantly when combined with near detector and reactor experiments.…”

“…INTRODUCTIONToday, physics is going through precision era-this is more so for Neutrino physics. With the measurement of reactor mixing angle θ 13 [1-3] precisely by reactor experiments, the unknown quantities left to be measured in neutrino sector are − leptonic CP violating phase [4][5][6][7][8][9], octant of atmospheric angle θ 23 [10-14], mass hierarchy, nature of neutrino etc. Long baseline neutrino experiments (LBNE [15, 16], NOνA [17] , T2K [18], MINOS [19], LBNO [20] etc) may be very promising, in measuring many of these sensitive parameters.…”

“…by us [4], where we have explored different possibilities of improving CPV sensitivity for LBNE, USA. We did so by considering LBNE with 1.…”

Maximizing the DUNE early physics output with current experiments

“…The LBNE experiment [48] in the United States and the LBNO experiment [49] in Europe were two of the proposals for such a facility. Many studies have explored the physics reach of these experiments [28,[50][51][52][53][54][55][56][57][58][59][60][61]. These different proposals are now converging into a unified endeavor of a long-baseline experiment using a high-intensity beam from Fermilab.…”

Studying the physics potential of long-baseline experiments in terms of new sensitivity parameters

“…In LBL experiments, the experimental configurations: LBNE(L = 1280 km, E = 3.55 ± 1.38 GeV) and LBNO(L = 2300 km, E = 5.05 ± 1.65 GeV) [11] are so chosen, that the asymmetry between ν µ → ν e and ν µ → ν e oscillation probabilities is larger than the CP violation effects produced by δ CP phase, which makes these suitable for determining the mass hierarchy as well as δ CP phase [12]. The recently proposed neutrino oscillation experiment viz.…”