University of Connecticut

Events Calendar

Physics Colloquium (Prof. Lee Roberts, Boston University)

Friday, February 8, 2019
3:30pm – 4:30pm

Storrs Campus
GW-38

Prof. Lee Roberts, Boston University

Searching for Physics Beyond the Standard Model with the World’s Largest Penning Trap

Measurements of the magnetic moments of the electron and muon were intertwined with the development of the “modern physics” of the 20th century. For the muon, this trend continues, perhaps pointing to New Physics beyond the Standard Model (BSM). The magnetic moment is along the spin, For leptons, the factor g is greater than the Dirac value of 2 because of radiative corrections, so g =2(1+ a), or equivalently a = (g-2)/2, where a is the magnetic anomaly. While the value of the muon anomaly is dominated by the lowest-order Schwinger term /2≃ 0.00116⋯, it is necessary to include higher order contributions from QED, as well as contributions from the strong interaction and electroweak gauge bosons, to compare with the experimental value. The SM value now has an uncertainty of 0.3 parts per million (ppm), and the experimental value has an uncertainty of ± 0.54 ppm. The experimental value is larger than the Standard Model value by ≃ 3.7 standard deviations, which could come from new, as yet undiscovered, BSM physics. To clarify this situation, a new experiment, E989 with the total error budget of ±0.14 ppm has been mounted at Fermilab and will soon begin the second data collection period. I will review the history of what we have already learned from previous (g-2) experiments, the physics reach of 989, and will report on its present status.

Friday, February 8, 2019 3:30 P.M. Gant Science Complex, Physics, GW-38

Coffee and tea will be served prior to the talk, at 3:00 p.m., In Room P-103

Contact:

Prof. Luchang Jin

Physics Department (primary), UConn Master Calendar

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