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High Energy Physics Seminar

Tuesday, March 6, 2018
4:00pm to 5:00pm
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Lauritsen 469
Peeking beyond the Standard Model: Muon g-2, Neutrino Mass Scale, and Free Neutron Decay
Martin Fertl, University of Washington,

Stringent tests of the Standard Model (SM) of Particle Physics and its proposed extensions (BSM) using frequency-based measurements of low energy observables are highly complementary to collider experiments at high energies. The new muon g-2 experiment at Fermilab aims to extract the muon anomalous magnetic moment, a, to the level of (a) < 140 ppb by measuring the difference of Larmor and cyclotron frequency of muons confined in a super-conducting magnetic storage ring. This fourfold improvement over the last experiment will scrutinize the persisting > 3 deviation from the SM prediction. The Project 8 experiment aspires to probe the absolute neutrino mass scale down to 40meV=c2 as the experimentally established lower limit for neutrino masses contradicts the SM. Our novel technique of cyclotron radiation emission spectroscopy (CRES) opens a new avenue towards measuring the energy spectrum of atomic tritium -decay, which is sensitive to m 6= 0 by a distortion of the spectrum around the decay endpoint energy. CRES also provides a new tool to search for contributions from hypothetical scalar and tensor-like interactions to the decay of short-lived, neutron-rich nuclei or neutrons. I will discuss how these experiments fathom the boundaries of the SM with ultimate precision and allow us to peek beyond the SM based on superb control of the experiments' magnetic field environments.

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