# Events

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### Monday, August 22nd, 2022

No events scheduled

### Tuesday, August 23rd, 2022

Sterile Neutrino Search with the NOvA Detectors
Time: 9:00 am
Place: Chamberlin 4274
Speaker: Harry Hausner , Physics PhD Graduate Student
Abstract: NOvA is a two detector experiment designed to observe neutrino oscillations from $\nu\mu$ to $\nu_e$ flavor states. Additionally, the location of the NOvA Near Detector is well situated to additionally observe short baseline oscillations to sterile neutrino states. We expand upon previous NOvA sterile neutrino searches by using a covariance matrix fitting technique. This analysis is the first with NOvA to directly include neutrino interactions in the Near Detector while fitting the data. The NOvA Near Detector's greater statistics to better constrain our Far Detector uncertainties in addition to increasing the range of $\Delta m^2{41}$ to which we are sensitive.

Host: Brian Rebel

### Wednesday, August 24th, 2022

Measuring the Atmospheric Neutrino Oscillation Parameters with IceCube DeepCore
Time: 1:00 pm
Place: Chamberlin 4274
Speaker: Kayla DeHolton , Physics PhD Graduate Student
Abstract: TBD
Host: Francis Halzen

### Thursday, August 25th, 2022

A Few New Techniques for Probing IceCube Data and a Search for High Energy Atmospheric Neutrinos
Time: 2:00 pm
Place:
Speaker: Bunheng Ty, Physics PhD Graduate Student
Abstract: The idea of characterizing an IceCube event by its location and magnitude of maximum photon density is proven useful. A complete set of new filter tools built around this idea is successfully developed and used to detect high-energy neutrino interactions inside IceCube. The two key features to search for are: a highly localized deposit of photoelectrons, and a lack of a veto track leading up to it. The first is achieved reliably by counting photoelectrons making up the most photon-dense region of the event. The second is achieved with moving cylinders (160 m radius, 240 m half-height, 0.3 m/ns speed), one at each possible direction from the sky, collecting any DOM forming a muon track pattern with the region. In addition to the traditional true starting events, this new approach allows, for the first time, a direct search for the self-veto events of the atmospheric neutrinos. The no-veto condition is loosened to allow up to a very small veto, just enough to be still outside the region of the atmopsheric muon background. The final selection consists of 23 events, one of which is a self-veto event of 134 TeV Millipede reconstructed energy. This data, though limited, shows a measurable contribution of the atmospheric component to the neutrino flux at the high energies. A lower bound estimate is given for the atmospheric contribution to IceCube’s HESE sample to be at least at the level of 1 percent.
Host: Kael Hanson

### Friday, August 26th, 2022

No events scheduled

### Saturday, August 27th, 2022

No events scheduled