GRB221009A and the IceCube neutrino absence : probing a dominant prompt charm signal?

Abstract

IceCube, the kilometer cube neutrino detector in South Pole, had been recording neutrinos in TeVs-PeVs energy range, since more than a decade. The upgoing TeVs-energy muon neutrinos are well tuned to the expected secondary conventional atmospheric cosmic rays (pions, kaons). These upward TeVs events are governed by muon-neutrino tracks. Their rare cascades from the neutral current or from the very rare atmospheric electron neutrino are well known. However, at the highest energies above fifty TeV, as noted ten years ago, neutrinos cascading at hundreds of TeV-PeV energies outnumbered muon-track neutrinos. This revolution in the flavor ratio of the events has led most authors to claim the rise of an astrophysical neutrino signature. A more recent (2017) track-AGN correlation of the high-energy muon neutrino appears to confirm an astrophysical signature of the neutrino. However, the absence or paucity of tau double bang events, the flavor asymmetry of upward and downward signals, the absence of the highest gamma event with a neutrino companion, led us to suggest an atmospheric prompt nature of most IceCube records. The recent brightest gamma burst GRB221009A and its absence in IceCube, offer further arguments to a such atmospheric charmed model.