Speaker
Description
The Chiral Belle project, an upgrade of SuperKEKB with polarized electron beams, provides entirely unique opportunities to search for new physics via precision electroweak and other measurements, including measurements involving the tau lepton. The neutral current vector couplings will be precisely determined at 10GeV from left-right cross-section asymmetry measurements of e+e- annihilation to pairs of electrons, muons, taus, charm and b-quarks. The precision of these individual measurements will match or exceed those of current world averages, which were made at the Z-pole. Because these measurements will be made at 10GeV, they provide unique, high precision probes the running of the weak mixing angle from measurements of the different fermions. Chiral Belle will also provide the highest precision measurements of neutral current universality ratios, precision measurements of tau lepton properties, including the tau magnetic moment and Michel parameters. This paper will review recent work on the physics potential and report on the status of R&D initiatives underway to realize this upgrade. These R&D initiatives include the development of polarized sources, a Compton polarimeter, and compact spin rotator magnets designed to be ‘drop-in’ replacements of existing dipole magnets in the SuperKEKB High Energy Ring.
| Keyword-1 | precision electroweak physics |
|---|---|
| Keyword-2 | polarized beams |
| Keyword-3 | accelerator physics |