High Energy Physics Seminar

Friday 6 Mar 2026, 11:30 → 13:00 Europe/Warsaw

Room: B2.38 (Wydział Fizyki UW)

11:30 → 13:00 Oscillatory pattern of atmospheric muon neutrino disappearance in Super-Kamiokande

Energy of atmospheric neutrinos observed in the Super-Kamiokande detector ranges from hundreds of MeV to a TeV scale, while the baseline spans from 10km to 13000km. The broad energy and baseline distributions of atmospheric neutrinos result in a range of L/E which spans four orders of magnitude and contains multiple minima and maxima of the muon neutrino survival probability. On the other hand, the reconstruction of neutrino energy and baseline is based solely on the properties of charged particles produced in neutrino interaction, resulting in a non-perfect resolution of L/E and smearing of the oscillatory pattern.

I will present the results of the latest SK’s atmospheric neutrino oscillation analysis, in which the oscillatory pattern of muon neutrino survival probability is studied directly as a function of the reconstructed neutrino flight length divided by the reconstructed neutrino energy. In order to retain the oscillatory shape and minimize the smearing of the survival probability distribution, only a subset of atmospheric neutrino events, with an estimated high resolution of L/E, is binned according to the L/E scheme.

Speaker: Mariusz Girguś (IFD UW)

M_Girgus_slides_for_indico.pdf