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UID:UW-Physics-Event-8949
DTSTART:20241024T190000Z
DTEND:20241024T210000Z
DTSTAMP:20260413T223337Z
LAST-MODIFIED:20241010T150907Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Characterizing the Diffuse Astrophysical Neutrino Flux with Co
 ntained and Uncontained Cascades in IceCube\, Preliminary Exam\, Zoe R
 echav\, Physics PhD Graduate Student
DESCRIPTION:Recently\, the IceCube Neutrino Observatory has reported a
  deviation from a single power law in the extragalactic diffuse neutri
 no flux. This deviation is primarily driven by the hardening of the lo
 w-energy flux below 30 TeV. However\, uncertainties remain in many fea
 tures of the neutrino flux across the energy spectrum\, including but 
 not limited to the characterization of the neutrino flux below 30 TeV\
 , the flux bump at ~30 TeV\, the flux dip at ~500 TeV\, and the charac
 terization of the neutrino flux above 10 PeV. A stronger constraint on
  the energy spectrum is needed to resolve these uncertainties.<br>\n<b
 r>\nThe DNNCascades event selection is a neural network based\, high s
 tatistics cascade-like dataset that was first used to detect high ener
 gy neutrinos in the Galactic plane. As well as contained cascades\, th
 e selection includes ~30% uncontained cascades – neutrinos with inte
 raction vertices at the edge or outside of the detector instrumentatio
 n volume. The high statistics\, contained and uncontained cascades eve
 nt selection could be key to more tightly constraining the diffuse flu
 x across the energy spectrum.<br>\n<br>\nMy work involves optimizing t
 his unique event selection to bring into the diffuse neutrino physics 
 space. Extensive work on updated atmospheric neutrino background model
 ing\, systematics updates\, and data/MC improvement will be discussed\
 , as well as my intention to perform an astrophysical diffuse flux mea
 surement that could resolve uncertain features of the astrophysical sp
 ectrum.
URL:https://www.physics.wisc.edu/events/?id=8949
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