# ICHEP 2020

28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

## Upgrading SuperKEKB with polarized e- beams

29 Jul 2020, 16:30
20m
virtual conference

#### virtual conference

Talk 11. Accelerator: Physics, Performance, and R&D for Future Facilities

### Speaker

Michael Roney (University of Victoria)

### Description

Upgrading the SuperKEKB e+e- collider with a polarized e- beam is under consideration as it enables a new program of precision electroweak and other physics at 10.6 GeV, thereby opening exciting new windows in search of new physics. Measurements of left-right asymmetries ($A_{LR}$) of e+e- transitions to pairs of muons, c- and b-quarks would yield substantial improvements to the determinations of the neutral current vector coupling of those final states and hence $\sin^2\theta_W$. $A_{LR}$ measurements of final state e+e- and taus would determine $\sin^2\theta_W$ with the Z-pole precision but at much lower energy. These will probe the running and universality of neutral current couplings with unprecedented precision. Other Tau and QCD physics is also enhanced. This paper will include a discussion of the physics as well as the necessary upgrades to SuperKEKB: polarized e- source, precision polarimetry, and spin rotators that all must be introduced while maintaining the high luminosity

 Secondary track (number) 4

### Primary author

Michael Roney (University of Victoria)