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This Week at Physics

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Events on Friday, April 26th, 2013

WID Distinguished Lecture Series
Wisconsin Festival of Ideas Lecture
Time: 9:00 am
Place: H.F. Deluca Forum & Atrium, Wisconsin Institutes for Discovery
Speaker: Sridhara Dasu, UW Physics
Abstract: Sridhara Dasu (Physics) and David Rakel (Family Medicine) will engage the audience with a discussion about some of best ideas and collaborations happening on campus.
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Theory Seminar (High Energy/Cosmology)
On The Way To A Systematic Study of (Radiative) Neutrino Mass Generation
Time: 2:15 pm
Place: 5280 Chamberlin Hall
Speaker: Michael Schmidt, University of Melbourne
Abstract: To unravel the mystery of neutrino masses and mixing angles, we adopt a bottom-up approach based on effective operators which violate lepton number by 2 units. By opening the effective operators, we can find the corresponding minimal UV completions. We present an example based on a dimension-9 operator and study its neutrino mass generation and related flavour physics.
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Physics Department Colloquium
Physics and Astrophysics from Ultrahigh Energy Cosmic Ray observations
Time: 3:30 pm
Place: 2241 Chamberlin Hall (coffee at 4:30 pm)
Speaker: Glennys Farrar, New York University
Abstract: Predictions for UHECR air showers using hadronic event generators tuned with LHC and lower energy accelerator data, are in serious tension with Pierre Auger Observatory measurements, for any assumed primary composition. It appears very difficult to get agreement with observations, without invoking new physics above LHC energies. Some options for types of new physics which can explain the data (and others which cannot) will be discussed. Fortunately, as will be shown, there is intrinsically enough information in hybrid events -- those observed with both air fluorescence and ground detectors -- to constrain the new physics and composition simultaneously. With improvements in separating the electromagnetic and muonic components of the ground signal, it should be possible to obtain remarkably detailed diagnostics about what is wrong in present hadronic event generators, and estimate composition on an event-to-event basis. Some new astrophysics results pertaining to UHECR sources and deflections in the Galactic magnetic field will be presented as well.
Host: Coppersmith
Poster: http://www.physics.wisc.edu/twap/posters/2013/2852.pdf
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