论文标题
使用0.37 MEGATON $ \ CDOT $ $ YEAR的超级Kamiokande销售
Neutron-Antineutron Oscillation Search using a 0.37 Megaton$\cdot$Year Exposure of Super-Kamiokande
论文作者
论文摘要
作为违反$ΔB= 2 $的BARYON数字，中子 - 抗逆转振荡（$ n \ to \ bar n $）提供了对BARYON数字保护的独特测试。我们已经在超级kamiokande中进行了$ n \ to \ bar n $振荡，并在其前四个运行期中进行了完整的数据集，这是0.37〜mton年的暴露。该搜索使用了对模拟的$ n \ to \ bar n $事件和大气中微子背景进行培训的多元分析，并导致11个候选事件，预期背景为9.3事件。在没有统计学上显着的过剩情况下，我们在$^{16} $ 3.6 \ $ 3.6 \ times {10}^{32} $年度和中子 - 抗antineutron振荡时间$ 3.6 \ times {10}^{32} $ 3.6 \ times {10}^n \ t $τ_{n \ to \ bar n} $ 4.7 s $ s in Neutron-antineutron振荡时间上的下限是$^{16} $ o nuclei的下限。
As a baryon number violating process with $ΔB=2$, neutron-antineutron oscillation ($n\to\bar n$) provides a unique test of baryon number conservation. We have performed a search for $n\to\bar n$ oscillation with bound neutrons in Super-Kamiokande, with the full data set from its first four run periods, representing an exposure of 0.37~Mton-years. The search used a multivariate analysis trained on simulated $n\to\bar n$ events and atmospheric neutrino backgrounds and resulted in 11 candidate events with an expected background of 9.3 events. In the absence of statistically significant excess, we derived a lower limit on $\bar n$ appearance lifetime in $^{16}$O nuclei of $3.6\times{10}^{32}$ years and on the neutron-antineutron oscillation time of $τ_{n\to\bar n} > 4.7\times10^{8}$~s at 90\% C.L..
