| Abstract: | Hyper-Kamiokande will be a next generation underground water Cherenkov
detector with a total (fiducial) mass of 0.99 (0.56) million metric tons,
approximately 20 (25) times larger than that of Super-Kamiokande. One of the
main goals of Hyper-Kamiokande is the study of $CP$ asymmetry in the lepton
sector using accelerator neutrino and anti-neutrino beams.
In this paper, the physics potential of a long baseline neutrino experiment
using the Hyper-Kamiokande detector and a neutrino beam from the J-PARC proton
synchrotron is presented. The analysis uses the framework and systematic
uncertainties derived from the ongoing T2K experiment. With a total exposure of
7.5 MW $ imes$ 10$^7$ sec integrated proton beam power (corresponding to
$1.56 imes10^{22}$ protons on target with a 30 GeV proton beam) to a
$2.5$-degree off-axis neutrino beam, it is expected that the leptonic $CP$
phase $delta_{CP}$ can be determined to better than 19 degrees for all
possible values of $delta_{CP}$, and $CP$ violation can be established with a
statistical significance of more than $3,sigma$ ($5,sigma$) for $76\%$
($58\%$) of the $delta_{CP}$ parameter space. Using both $
u_e$ appearance
and $
u_mu$ disappearance data, the expected 1$sigma$ uncertainty of
$sin^2 heta_{23}$ is 0.015(0.006) for $sin^2 heta_{23}=0.5(0.45)$. |
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