The Grainger College of EngineeringPhysics

Physics - High Energy Physics Seminar

View Full Calendar

High Energy Phenomenology Seminar: Kevin Zhang (University of California, Santa Barbara) "Magic Zeroes and Hidden Symmetries"

Event Type
Seminar/Symposium
Sponsor
Department of Physics
Location
Room 464
Date
Sep 23, 2022   11:00 am  
Speaker
Kevin Zhang
Contact
Brandy Koebbe
E-Mail
BKOEBBE@ILLINOIS.EDU
Views
25

Selection rules arising from accidental or broken symmetries may be sufficiently obscure that their agency is hidden, leading to the appearance of “magic zeroes” – quantities that are suppressed without apparent recourse to a symmetry explanation. Magic zeroes and their corresponding hidden symmetries may shed new light on parametric hierarchies in the Standard Model and beyond. We identify the hidden symmetry responsible for a recently-discovered magic zero, the vanishing  of the putative leading contribution to the anomalous dipole moments of the muon upon integrating out weak doublet and singlet vector-like fermions. Some of the tools involved – spurion analysis leveraging discrete symmetries of the free theory, field redefinitions, spectator fields, and non-supersymmetric non-renormalization theorems – may prove useful in the hunt for new magic zeroes and their hidden symmetries.

 
link for robots only

Physics

The Grainger College of Engineering

1110 West Green Street

Urbana, IL 61801

Email Us

217.333.3761