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UID:UW-Physics-Event-9343
DTSTART:20250821T210000Z
DTEND:20250821T230000Z
DTSTAMP:20260413T102659Z
LAST-MODIFIED:20250807T185823Z
LOCATION:5280 Chamberlin
SUMMARY:Search for the Highest Energy Neutrinos in IceCube\, Prelimina
 ry Exam\, Maxwell Nakos\, Physics PhD Graduate Student
DESCRIPTION:Recently\, KM3Net has detected a neutrino candidate with a
  best fit neutrino energy of 220 (-110\,+570) PeV\, while the highest 
 energy event from IceCube has a best fit neutrino energy of 11.4 (-2.5
 3\,+2.46) PeV. Due to the absorption from the Earth\, neutrinos with e
 nergies greater than 10 PeV are likely to originate from the horizonta
 l and downgoing directions\, where there is a large\, high energy atmo
 spheric muon background from cosmic rays.<br>\n<br>\nTo address this\,
  I develop neural networks to improve background rejection for downgoi
 ng tracks from the southern sky\, recovering throughgoing neutrinos ty
 pically discarded due to high atmospheric muon contamination. These ev
 ents enable a search for extremely high-energy neutrinos\, which are i
 ncorporated into a diffuse combined fit - including cosmogenic\, astro
 physical\, and atmospheric components - to probe the apparent tension 
 between KM3NeT and IceCube observations at the highest energies.<br>\n
 <br>\nIn parallel\, I am also developing a transient analysis looking 
 for spatial and timing correlations between ultra-high-energy photon c
 andidates detected by the Pierre Auger Observatory and multi-flavor ne
 utrinos detected by the IceCube Neutrino Observatory\, the first searc
 h for ultra-high-energy transient sources combining neutral particle i
 nformation from UHE photons and neutrinos.
URL:https://www.physics.wisc.edu/events/?id=9343
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