T2K远探测器系统误差的估计
Estimating detector systematic uncertainties for the T2K far detector
AI总结：
本文介绍T2K远探测器SK系统误差估计的升级方法，通过540维MCMC拟合大气中微子MC与数据，并针对新增分析样本引入专门系统误差，以降低振荡参数测量中的探测器不确定性。
摘要：
东海到神冈（T2K）是一个长基线中微子振荡实验，用于测量与$ν_μ(\barν_μ)$消失和$ν_e(\barν_e)$出现相关的振荡参数，实验使用$ν_μ(\barν_μ)$束流。T2K采用超级神冈（Super-Kamiokande，SK）作为其远探测器，目前SK探测器的系统误差是T2K振荡分析中系统不确定性的主要来源之一。因此，准确理解SK中探测器建模偏差和事例重建的不确定性对于提取中微子振荡参数至关重要。探测器误差估计程序通过在马尔可夫链蒙特卡罗（Markov Chain Monte Carlo，MCMC）框架中将SK大气中微子蒙特卡罗（MC）拟合到数据来量化不确定性。不确定性根据SK大气MC中切伦科夫阈值以上的真实事例拓扑进行分类，以便在传播到T2K束流振荡分析时，能够刻画这些不确定性应如何影响不同的信号和本底样本。该程序已针对即将到来的分析周期进行了升级，其中包括针对新增的$ν_eCC1π^\pm$和$NCπ^0$增强分析样本的系统误差，以及其他改动，最终在SK中实现了大气MC与数据之间的540维MCMC拟合。本文将讨论远探测器分析链及其与更广泛的T2K振荡分析的整合。
英文摘要：
Tokai to Kamioka (T2K) is a long-baseline neutrino oscillation experiment that measures oscillation parameters related to both $ν_μ(\barν_μ)$ disappearance and $ν_e(\barν_e)$ appearance in a $ν_μ(\barν_μ)$ beam. T2K uses Super-Kamiokande (SK) as its far detector, and SK detector systematic errors are currently among the leading sources of systematic uncertainty in the T2K oscillation analysis. Therefore, accurate understanding of detector mis-modelling and event reconstruction uncertainties in SK is crucial to the extraction of the neutrino oscillation parameters. The detector error estimation procedure quantifies uncertainties by fitting SK atmospheric MC to data in a Markov Chain Monte Carlo (MCMC) framework. Uncertainties are separated based on true event topology above Cherenkov threshold in the SK atmospheric MC in order to capture how the uncertainties should affect the different signal and background samples when propagated to the T2K beam oscillation analysis. The procedure has been upgraded for the upcoming analysis cycle to include systematics targeting newly added $ν_eCC1π^\pm$ and $NCπ^0$-enhanced analysis samples, among other changes, culminating in a 540 dimensional MCMC fit between atmospheric MC and data in SK. The far detector analysis chain and its integration into the broader T2K oscillation analysis will be discussed in these proceedings.
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