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

T2K实验是一个长基线中微子振荡实验，由三个主要部分组成：日本东海岸的J-PARC加速器产生的μ子中微子束，距离光束产生目标下游280米的一套近探测器，以及距离日本西海岸295公里的远探测器。来自近距离探测器的信息被用来表征非振荡μ子中微子束。然后使用得到的信息，以便利用远端探测器的数据提取振荡参数。离轴近端探测器ND280以与远端探测器Super-Kamiokande （SK）相同的离轴角度对光束进行采样。利用ND280的数据，将束流和中微子相互作用截面的系统不确定性降低了约3倍。这产生了一组更精确的模型参数，用于测试在SK收集的数据，因此导致测量振荡参数的精度显著提高。亚当将工作在ND280适合的数据，并将使用它来约束模型参数。他将与振荡分析小组和ND280拟合小组的其他成员密切联系。他可能会首先为拟合开发一个新的样本，这将有助于约束拟合目前不敏感的参数。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。在T2K关闭后（2022年底），他还可以帮助ND280电磁量热计的调试，届时ND280将升级一些新的探测器。

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.