| 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 document, 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 has been updated from the
previous Letter of Intent [K. Abe et al., arXiv:1109.3262 [hep-ex]], based on
the experience gained 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 produced by the J-PARC proton synchrotron,
it is expected that the $CP$ 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. |
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