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This Week at Physics

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Events on Tuesday, October 2nd, 2012

Chaos & Complex Systems Seminar
Mitochondrial proteins, pathways and pathogenesis
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Dave Pagliarini, UW Department of Biochemistry
Abstract: Mitochondria are ubiquitous, tiny metabolic machines that live inside nearly all of our cells. Collectively, the make up ~10% of our body weight, and consume ~90% of the oxygen that we breath. They are best known for their role as "power plants" that transform different fuel sources into the universal cellular energy currency, ATP. However, their physiological functions are much more diverse, and their dysfunction leads to a wide spectrum of human disorders ranging from cancer to neurodegeneration. My group studies the composition and biogenesis of these organelles, and how defects in specific mitochondrial proteins gives rise to human disorders. To do so, we leverage a broad range of techniques including mass spectrometry-based proteomics, chemical genetics and mouse physiology.
Host: Sprott
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High Energy Seminar
Updated results from the T2K long baseline neutrino experiment
Time: 3:00 pm
Place: 4274 Chamberlin
Speaker: Kendall Mahn, TRIUMF
Abstract: An unresolved problem in the Standard Model is the observed presence
of matter and lack of corresponding antimatter in the universe. To
explain the matter-antimatter asymmetry, Sakharov suggested three
conditions had to be met: that baryon number is violated, CP violation
and that matter and antimatter are out of thermal equilibrium. A
sufficient source of CP violation could be from new physics in the
quark sector, or in the lepton sector within neutrino mixing.

The conversion of muon neutrinos to electron neutrinos, nue
appearance, is sensitive to CP violation between the light neutrinos,
which can be related to CP violation of a hypothetical heavy neutrino
in the early universe to meet Sakharov's conditions. However, nue
appearance is also dependant on precision measurements of other mixing
parameters, including Dm2(32), theta(23) and theta(13). The
Tokai-To-Kamioka (T2K) long baseline neutrino experiment is designed
to precisely measure muon neutrino disappearance (Dm2(32), theta(23))
and nue appearance. The experiment uses a beam of muon neutrinos
generated at the J-PARC facility in Tokai-mura, Japan, which is
sampled by two near detectors, ND280 and INGRID, before reaching the
Super-Kamiokande detector, 295km away. Since the March 2011
earthquake, T2K has recovered, resumed and updated the nue appearance
analysis with an increased data set corresponding to 3.01e20 protons
on target (at 15.5 kW x 10^7 s). This seminar will highlight T2K's
incredible recovery and analysis improvements, and discuss prospects
for future neutrino-based searches for CP violation in the lepton
sector.
Host: Karsten Heeger
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