PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Accelerator: Physics, Performance, and R&D for Future Facilities
Upgrading SuperKEKB with polarized e- beams
M. Roney* On behalf of the Belle II SuperKEKB e−Polarization Upgrade Working Group
*corresponding author
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Pre-published on: February 27, 2021
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Upgrading the SuperKEKB e+e- collider with a polarized electron beam is under consideration as it enables a new program of precision electroweak and other physics at 10.6GeV, 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 $\sin^2\theta_W$. Combining $A_{LR}$ measurements from all final-state lepton-pairs 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.
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