SciPost Submission Page
Chiral Belle: e- Beam Polarization Upgrade of SuperKEKB
by J. Michael Roney
Submission summary
| Authors (as registered SciPost users): | J. Michael Roney |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202407_00009v1 (pdf) |
| Date accepted: | 2024-12-04 |
| Date submitted: | 2024-07-04 19:04 |
| Submitted by: | Roney, J. Michael |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 17th International Workshop on Tau Lepton Physics (TAU2023) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
Recent R&D work associated with upgrading the SuperKEKB e+e− collider with polarized electron beams is presented. The Chiral Belle physics program enables a set of unique precision measurements using the Belle II detector. It includes a set of measurements of $sin^2θ_W$ via separate left-right asymmetry ($A_LR$) measurements in annihilations to pairs of electrons, muons, taus, charm and b-quarks that yield precisions matching or exceeding those of the current world averages from measurements at the $Z^0$-pole, but at 10GeV. Consequently these measurements provide unique probes the running of with high precision. Chiral Belle will also probe for new physics via the highest precision measurements of neutral current universality ratios and precision measurements of tau lepton properties, including the tau magnetic moment. After reviewing developments on the physics potential, this presentation will report on developments related to provision of the polarized source, the new components of the accelerator lattice that rotate the electron spin from transverse to longitudinal at the interaction point, and polarimetry of the electron beam.
Current status:
Editorial decision:
For Journal SciPost Physics Proceedings: Publish
(status: Editorial decision fixed and (if required) accepted by authors)
Reports on this Submission
Report #1 by Swagato Banerjee (Referee 1) on 2024-11-24 (Invited Report)
Report
Electron beam polarization upgrade of the SuperKEKB/Belle II experiment enhances the physics discovery potential in unique ways with unprecedented precision. These precision measurements provide unique probes in the running of the weak mixing angle, the highest precision measurements of neutral current universality ratios and precision measurements of tau lepton properties, including the tau anomalous magnetic moment. The hardware components include a polarized source, spin rotator and a Compton polarimeter. Initial studies have shown that these upgrades are entirely feasible and a detailed Conceptual Design report is in preparation.
Recommendation
Publish (surpasses expectations and criteria for this Journal; among top 10%)