The Return of the LHC

Nathaniel Craig / University of California Santa Barbara
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This final colloquium for Spring 2022 is Now ZOOM or You Tube only.

Participate via Zoom: https://cuboulder.zoom.us/j/99841669539

Participate via YouTube: https://youtu.be/sjHEI_ymkLo

 

Abstract: The LHC re-awakens this week after a three-year slumber, building towards proton-proton collisions at the highest energies yet attained. While the 2012 discovery of the Higgs boson at the LHC marked the triumphant completion of the Standard Model, the LHC re-awakens to a Standard Model under siege. Tension between the muon’s anomalous magnetic dipole moment and the Standard Model prediction now exceeds four standard deviations, while various decays of bottom quarks into lighter quarks and leptons appear to deviate from Standard Model predictions at the level of three to five standard deviations. Earlier this month, the CDF experiment at the Tevatron announced the world’s most precise measurement of the mass of the W boson, obtaining a result nominally seven standard deviations away from the Standard Model prediction. These growing tensions add to long-standing motivation for physics beyond the Standard Model, ranging from the mechanism of electroweak symmetry breaking to the origin of the masses and mixings of fundamental particles, the predominance of matter over antimatter, and the nature of dark matter. In this talk I’ll survey the LHC's prospects for illuminating both recently-discovered cracks and long-standing mysteries of the Standard Model, as well as the possible connections between the two.

 

P.S. Previous physics colloquia are always available on our YouTube playlist: https://youtube.com/playlist?list=PLaWHFWu_46_we7TpuGvA_PU07qUff_Qvy