A comprehensive study of the characteristics of a single bar from the proposed ToF detector

Neutrino Physics has the potential to revolutionise our understanding of how the universe works. Measurements of neutrinos coming from the Sun or produced by cosmic rays in the Earth's atmosphere shed light on neutrino oscillations, leading to groundbreaking information on neutrino masses and their mixing. One experiment studying neutrino oscillations is the T2K (Tokai to Kamioka) experiment in Japan. Commissioned in 2009, it will now be upgraded to increase its sensitivity. A part of the upgrade involves the introduction of a Time-of-Flight (ToF) detector surrounded by a new fine-grained fully-active plastic scintillator detector(Super-FGD) and two high angle Time-Projection Chambers (TPCs). In this paper, we investigate the single-bar cosmic ray data from the proposed ToF detector, characterise light propagation in the bar, and describe arrival time distribution and time resolutions. A model on light propagation and intensity evolution through the bar is proposed and tested, and the time resolution as a function of location along the bar is portrayed.