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This Week at Physics

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Events on Friday, May 2nd, 2014

Theory Seminar (High Energy/Cosmology)
A MSSM scenario with a light stau and a bino DM
Time: 2:15 pm
Place: 5280
Speaker: Kaoru Hagiwara, KEK Theory Center, Japan
Abstract: We study signals of pair produced scalar-tau's that decay into a tau and a light bino at the LHC, for a specific MSSM scenario which could explain the observed gamma ray spectrum in the low-latitudes of Fermi Bubble in the Galactic center.
The scenario is consistent with the observation only when the dark matter is almost pure bino and the light stau of mass around 100 GeV is a maximally mixed state. The higgsino component of the dark matter is constrained by the Higgs invisible width and the direct DM search experiments, while the large stau mixing enhances the Higgs to two gamma rate and breaks lepton universality of electroweak observables.
At the LHC, both the stau pair production cross section and the produced tau polarization depends strongly on the stau mixing. We show that there is a possibility of observing the signal in tau-pair production events with large missing transverse momentum at LHC8 with 20/fb of integrated luminosity.
Host: Jordi Salvado
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Physics Department Colloquium
Annual Awards Banquet Speaker
The 1991 UN Inspections of Iraq: A Look Back Across Two Decades
Time: 4:00 pm
Place: 2241 Chamberlin Hall (coffee at 3:30 pm)
Speaker: Jay Davis, President of Hertz Foundation and Chair of the Physics Department Board of Visitors
Abstract: In the summer of 1991, Jay Davis was asked on five days notice to join a UN inspection team for Iraqi nuclear facilities to determine whether or not the Iraqis had an active nuclear weapons program. He played leadership, operational, and technical roles in assessing what proved to be an excellent and well-advanced weapons program. There were technical surprises, obvious intelligence lapses, occasional incidents of gunfire, and other experiences somewhat off the norm for physics research. In consequence, Davis ended up briefing the UN Security Council, being asked to form a defense agency at DoD, and ending his physics career in a rather different manner than he had planned. This talk is a reprise of the first public talk he gave on the subject, a Physics Colloquium in Madison in September 1991. A student of Heinz Barschall, he is currently President of the Hertz Foundation and chairs the Board of Visitors for Physics at Wisconsin. This September will be fifty years since he came to Wisconsin as a graduate student.
Host: Department of Physics
Poster: http://www.physics.wisc.edu/twap/posters/2014/3178.pdf
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