Speaker
Description
A polarized electron beam is being considered as an upgrade for the SuperKEKB accelerator, which would enable a new precision electroweak physics program at Belle II. For many of the proposed measurements the dominant systematic uncertainty is expected to be the precision with which the average beam polarization is known. A novel technique for measuring beam polarization in $e^+e^-$ collisions, Tau Polarimetry, has been shown to be capable of measuring the average beam polarization to better than half a percent. The demonstration of the capabilities of Tau Polarimetry has been implemented at the BaBar experiment, a precursor experiment to Belle II, and the average beam polarization of it's associated accelerator, PEP-II, precisely measured. This presentation describes the physics underlying Tau Polarimetry, the systematic uncertainties which limit the technique, and the results of the BaBar measurement.
| Keyword-1 | Belle II |
|---|---|
| Keyword-2 | BaBar |
| Keyword-3 | Polarimetry |
