Speaker
Linyan WAN
(Boston University)
Description
As a baryon number violating process with $\Delta B = \Delta (B−L) = 2$, neutron-antineutron oscillation ($n\to\bar n$)provides an important candidate and a unique probe to the baryon asymmetry. We performed a search for $n\to\bar n$ oscillation with the Super-Kamiokande (SK) experiment. Full exposure data set of SK was analyzed using a multi-variate analysis based on kinematic variables and basic distributions from simulated $n\to\bar n$ signal events and atmospheric neutrino backgrounds. We observed 11 events, compared with the expected number of background events 9.3. The upper limit of nuclear lifetime is calculated as $3.6×10^{32}$ years at 90% CL, significantly improved from the present best-limit $1.9×10^{32}$ years of SK-I.
| Contribution Title | Neutron-antineutron oscillation search at Super-Kamiokande |
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Primary author
Linyan WAN
(Boston University)