Using the T2K near detector data to constrain the neutrino oscillation parameters

T2K实验是一项长基线中微子振荡实验，由三个主要部分组成：日本东海岸J-PARC加速器产生的Muon中微子束流，束流产生目标下游280米处的一套近探测器，以及日本西海岸附近295公里处的远探测器。来自近距离探测器的信息被用来描述没有振荡的Muon中微子束。然后使用所得到的信息，以便使用来自FAR探测器的数据来提取振荡参数。离轴近距离探测器ND280以与远距离探测器Super-Kamiokande(SK)相同的离轴角度对光束进行采样。来自ND280的数据被用来将束流和中微子相互作用截面中的系统不确定性降低到~3倍。这产生了一组更精确的模型参数，用于测试SK收集的数据，从而显著提高了测量的振荡参数的精度。Adam将在ND280上进行与数据匹配的工作，并将用它来约束模型参数。他将与振荡分析小组和ND280配件小组的其他成员密切联系。他可能会从开发一种新的FIT样本开始，这将有助于约束FIT目前对其不敏感的参数。他将学习运行执行拟合的软件，并分析他的新样本对模型参数的影响。他还可能在T2K关闭后(目前为2022年底)帮助ND280电磁量热计的调试，届时ND280将升级为一些新的探测器。

The T2K experiment is a long-baseline neutrino oscillation experiment consisting of three main parts: the muon neutrino beam produced by the J-PARC accelerator on the east coast of Japan, a suite of near detectors 280 m downstream of the beam production target, and a far detector 295 km away near the west coast of Japan. The information from the near detectors are used to characterise the unoscillated muon neutrino beam. The resulting information is then used in order to extract the oscillation parameters using the data from the far detector. The off-axis near detector, ND280, samples the beam at the same off-axis angle as the far detector, Super-Kamiokande (SK). Data from the ND280 is used to reduce the systematic uncertainty in the beam flux and the neutrino interaction cross sections by a factor of ~3. This yields a much more precise set of model parameters against which to test the data collected at SK, and therefore results in a significant improvement in the precision of the measured oscillation parameters.Adam will be working on the ND280 fit to the data and will use that to constrain the model parameters. He will liaise closely with the oscillation analysis group and the rest of the ND280 fitting group. He will likely begin by developing a new sample for the fit that will help to constrain parameters to which the fit is not currently sensitive. He will learn to run the software that performs the fit, and analyse the effect of his new sample on the model parameters. He may also help with the commissioning of the ND280 electromagnetic calorimeter after the T2K shutdown (present - end 2022) at which point the ND280 will be upgraded with some new detectors.