Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Recent result on search for nucleon decay and neutron-antineutron oscillation in Super-Kamiokande

Jul 7, 2012, 6:00 PM
1h
Melbourne Convention and Exhibition Centre

Melbourne Convention and Exhibition Centre

Melbourne Australia
Board: 20
Poster Sessions Track 3 - BSM - Non-SUSY Exotics Poster Session

Speaker

Dr Jun Kameda (ICRR, University of Tokyo (JP))

Description

We present recent results of the search for baryon number violating phenomena predicted by GUTs in Super-Kamiokande covering nucleon decay and neutron-antineutron oscillation. Grand Unified Theories (GUTs) seek to unify the strong and electroweak forces, and a unique prediction of the GUTs is baryon number violation. Two quarks in a nucleon can transform into a lepton and an antiquark resulting in a lepton plus meson final state. Super-Kamiokande (SK) is ring imaging water Cherenkov detector, containing 50 ktons of ultra-pure water, located in Kamioka-town in Gifu prefecture, Japan. The Super-Kamiokande experiment had started obvservation in 1996, and we collected data in four periods:SK-I (91.7kton year exposure), II (49.2 kton yr), III (31.9kton yr) and IV (on-going). We present the results on search for $p \rihgtarrow e^{+}+\pi^0$, $p \rihgtarrow \mu^{+}+\pi^0$, and $p \rihgtarrow \nu +\K^+$ based on SK-I to SK-IV data (219.8 kton yr exposure). The other nucleon decay modes to meson plus anti-leptons are also presented based on SK-I, SK-I+II, or SK-I+II+III data. Another possibility allowed by some of GUTs and Super Symmetric models is that neutron spontaneously changes to antineutron (called neutron-antineutron oscillation). We plan to present the final result of neutron-antineutron oscillation search in SK-I.

Primary author

Dr Jun Kameda (ICRR, University of Tokyo (JP))

Presentation materials