# Astroparticle Physics - A Joint TeVPA/ IDM Conference

Jun 23 – 28, 2014
Amsterdam
Europe/Zurich timezone

## Hyper-Kamiokande project

Jun 25, 2014, 4:50 PM
20m
Room 5 (Tuschinski Theatre)

### Room 5

#### Tuschinski Theatre

Presentation Neutrinos

### Speaker

Hiroyuki Sekiya (University of Tokyo)

### Description

Hyper-Kamiokande (Hyper-K) will be a next generation underground water Cherenkov detector with the total (fiducial) mass of 0.99 (0.56) million metric tons, which is approximately 20 (25) times larger than that of Super-Kamiokande. One of the main goals of Hyper-K is the study of CP asymmetry in the lepton sector using accelerator neutrino and anti-neutrino beams. With a total exposure of 7.5 MW $\times$ 10$^7$ sec integrated proton beam power (corresponding to 1.56 $\times$ 10 $^{22}$ 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 $\delta_{\rm CP}$ can be determined to better than 19 degrees for all possible values of $\delta_{\rm CP}$, and CP violation can be established with a statistical significance of 3$\sigma$ for 76$\%$ of the $\delta_{\rm CP}$ parameter space. Hyper-K’s high statistics data sample of atmospheric neutrinos will allow us to extract the information on the mass hierarchy and the octant of $\theta_{23}$. With a full 10 year duration of data taking, the significance for the mass hierarchy determination is expected to reach 3$\sigma$ or greater if $\sin^2\theta_{23} > 0.4$. The scope of studies at Hyper-K also covers high precision measurements of solar neutrinos, observation of supernova neutrinos, and dark matter searches.

### Primary author

Hiroyuki Sekiya (University of Tokyo)

 Slides