Particle Physics Seminar

First Direct Observation of Collider Neutrinos with FASER at the LHC

by Tobias Böckh (Uni Bonn)

Nußallee 12/1.049 (PI) - Conference Room II (PI)

Nußallee 12/1.049 (PI) - Conference Room II


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This talk presents the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in a 13.6 TeV center-of-mass energy pp collision data set of 35.4 fb−1 using the active electronic components of the FASER detector at the Large Hadron Collider. The candidates are required to have a track propagating through the entire length of the FASER detector and be consistent with a muon neutrino charged-current interaction. 153 neutrino interactions are inferred with a significance of 16 standard deviations above the background-only hypothesis. These events are consistent with the characteristics expected from neutrino interactions in terms of secondary particle production and spatial distribution, and they imply the observation of both neutrinos and anti-neutrinos with an incident neutrino energy of significantly above 200 GeV.

Organized by

William Sutcliffe, Tatjana Lenz