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Events on Tuesday, October 11th, 2022

Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
New Insights Into Lepton-Axion Interactions
Time: 2:00 pm
Place: Join Zoom Meeting Meeting ID: 912 3071 4547
Speaker: Jeff Dror , UCSC
Abstract: Axion-like particles (ALPs) below the electroweak scale are a simple, natural extension to the Standard Model and, as such, are one of the primary targets for the large-scale experimental effort to search for hidden sectors. In this talk, I revisit the theoretical framework of ALP interactions with leptons, finding some unexpected features in some amplitudes. Most importantly, I will show that there exist strong bounds on "leptophilic" ALPs from a combination of charged meson decays, W boson measurements, and proton beam dump experiments. These bounds dramatically shape allowed ALP parameter space and will be significantly improved with dedicated searches.

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Meeting ID: 912 3071 4547

Host: Baha Balantekin
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Council Meeting
Time: 3:00 pm - 4:00 pm
Place: 5290 Chamberlin Hall
Speaker: Mark Eriksson, UW-Physics
Host: Mark Eriksson
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Theory Seminar (High Energy/Cosmology)
Over-Extremal Brane Shells from String Theory
Time: 4:00 pm - 5:00 pm
Place: Chamberlin 5280
Speaker: Vincent Van Hemelryck, Leuven U.
Abstract: In this talk, I will argue that there must exist spherical brane shells in 4d that are overcharged, if the usual phenomenological compactifications of type IIB string theory with warped throats and anti-branes make sense. These shells correspond to classical over-extremal objects but without the usual naked singularities. The objects are made from D3-particles that puff into spherical 5-branes that stabilise at finite radii in 4d and whose inside corresponds to the supersymmetric AdS vacuum. We find that these objects can be significantly larger than the string scale depending on the details of the warped compactification.
Host: George Wojcik
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