arXiv 2201.051442022-01hep-ex

COMET的中微子相互作用

Neutrino interactions at COMET

D. Mulmule

备注：: 3 pages, 2 figures

摘要：

在有核存在的情况下，对μ子到电子的相干无中微子转换的实验探索，旨在探索带电轻子味违反的可能性。J-PARC的彗星实验就是这样一个装置，提供了前所未有的统计范围，单事件灵敏度低至$\mathcal{O}$（$\mathrm{10^{-17}}$）。它的后续实验-棱镜计划作为最后阶段，预计将进一步降低两个数量级。束缚μ子的标准模型衰变产生的电子被认为是探测这些转换电子最强大的物理背景。考虑到COMET和PRISM的高停止μ子统计，衰变中微子与核质子的带电相互作用速率也是不可忽略的。在这项工作中，我们进行了计算的正电子事件率预期由于电子反中微子与铝靶质子在彗星设置的相互作用。关于$\mathrm{7\pm1}$，预期每个$\mathrm{10^{18}}$停止μ子的$\mathrm{e^{+}}$事件。

英文摘要：

The experimental search for coherent neutrinoless conversion of muon to electron in the presence of a nucleus, aims to probe the possibility of charged lepton flavour violation. The COMET experiment at J-PARC is one such setup offering unprecedented statistical reach, with single event sensitivities down to $\mathcal{O}$ ($\mathrm{10^{-17}}$). Its successor experiment - PRISM, planned as the final stage, is expected to take this bound further down by two orders of magnitude. The electrons from standard model decay of bound muons are considered the most formidable physics background to the detection of these conversion electrons. Keeping in view the high stopped muon statistics for COMET and PRISM, the rate of charged current interaction of decay neutrinos with nuclear protons is also non-negligible. In this work, we perform a calculation of the positron event rates expected due to interactions of electron antineutrinos with Al target protons in the COMET setup. About $\mathrm{7\pm1}$ such $\mathrm{e^{+}}$ events per $\mathrm{10^{18}}$stopped muons are expected.

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