论文标题
通过$ p \ to e^+π^0 $和$ p \ toμ^+π^0 $搜索质子衰变，并在超级kamiokande I-iv中使用放大的基金量
Search for proton decay via $p\to e^+π^0$ and $p\to μ^+π^0$ with an enlarged fiducial volume in Super-Kamiokande I-IV
论文作者
论文摘要
我们已经通过$ p \ to e^+π^0 $和$ p \ toμ^+π^0 $模式搜索了质子衰变，并具有从1996年4月至2018年5月的Super-Kamiokande的扩大的基准体积数据，该数据与450 Kton $ \ cdot $年敞口相对应。对于此分析，我们已经累积了大约25％的生计，并将超级kamiokande检测器的基准量从22.5 kton升至27.2 kton，因此已有新的分析。在常规22.5 kton的基金量中，没有发现$ p \至e^+π^0 $的候选者，一个候选人仍然保留$ p \至μ^+π^0 $，并且与大气中微子背景预测一致。我们为每种模式设置了部分寿命的下限：$τ/b（p \ to e^+π^0）> 2.4 \ times 10^{34} $年和$τ/b（p \ toμ^+π^0）> 1.6 \ times 10^{34} $ 10^{34} $年满90％的信心级别。
We have searched for proton decay via $p\to e^+π^0$ and $p\to μ^+π^0$ modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton$\cdot$years exposure. We have accumulated about 25% more livetime and enlarged the fiducial volume of the Super-Kamiokande detector from 22.5 kton to 27.2 kton for this analysis, so that 144 kton$\cdot$years of data, including 78 kton$\cdot$years of additional fiducial volume data, has been newly analyzed. No candidates have been found for $p\to e^+π^0$ and one candidate remains for $p\to μ^+π^0$ in the conventional 22.5 kton fiducial volume and it is consistent with the atmospheric neutrino background prediction. We set lower limits on the partial lifetime for each of these modes: $τ/B(p\to e^+π^0) > 2.4 \times 10^{34}$ years and $τ/B(p\to μ^+π^0) > 1.6 \times 10^{34}$ years at 90% confidence level.
