Theory Seminar (High Energy/Cosmology)

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Events During the Week of October 9th through October 16th, 2016

Monday, October 10th, 2016

No events scheduled

Tuesday, October 11th, 2016

What can we learn from particle physics to study cosmological perturbation theory?
Time: 3:30 pm
Place: 5280 Chamberlin
Speaker: Min-Seok Seo, IBS, Korea
Abstract: Through the development of the effective field theory of inflation, we can interpret the cosmological perturbation theory as a quantum behavior of the Goldstone boson resulting from the spontaneous breaking of the time translation symmetry. Under this point of view, many wisdoms obtained from the particle physics have been applied to understand the inflationary cosmology. In this talk, we revisit such aspects of the cosmological perturbation theory in the multi-field context, providing more general framework.
Host: Gary Shiu
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Wednesday, October 12th, 2016

No events scheduled

Thursday, October 13th, 2016

Flavoured squark signatures at the LHC
Time: 3:30 pm
Place: 4274 Chamberlin Hall
Speaker: Gabriel Lee
Abstract: We present benchmark points for LHC searches from flavored gauge mediation models, in which messenger–matter couplings give flavor-dependent squark masses. Our examples include spectra in which a single squark—stop, scharm, or sup—is much lighter than all other colored superpartners, motivating improved quark flavor tagging at the LHC. Many examples feature flavor mixing; in particular, large stop–scharm mixing is possible. The correct Higgs mass is obtained in some examples by virtue of the large stop A-term. We also revisit the general flavor and CP structure of the models. Even though the A-terms can be substantial, their contributions to EDM’s are very suppressed, because of the particular dependence of the A-terms on the messenger coupling. This holds regardless of the messenger-coupling texture. More generally, the special structure of the soft terms often leads to stronger suppression of flavor- and CP-violating processes, compared to naive estimates.
Host: Joshua Berger
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Friday, October 14th, 2016

No events scheduled