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Dec 4 – 8, 2023
America/Kentucky/Louisville timezone

Measurement of beam polarization at an $e^+e^-$ $B$-Factory with a new tau polarimetry technique

Dec 5, 2023, 5:40 PM
20m
Plenary Presentation Tuesday afternoon

Speaker

Caleb Miller

Description

Belle II is considering upgrading SuperKEKB with a polarized electron beam. The introduction of beam polarization to the experiment would significantly expand the physics program of Belle II in the electroweak, dark , and lepton flavor universality sectors. For all of these future measurements a robust method of determining the average beam polarization is required to maximize the level of precision. The $BABAR$ experiment has developed a new beam polarimetry technique, Tau Polarimetry, which exploits the $\tau$ decay kinematics to measure the average beam polarization to better than half a percent. We present the results obtained by $BABAR$, including details of the studies of systematic uncertainties, using 420 $\text{fb}^{-1}$ collected at the $e^+e^-$ PEP-II collider, which demonstrates the feasibility of using Tau Polarimetry at future colliders such as an upgraded Belle II or the ILC.

Name of collaboration or list of co-authors

on behalf of the BaBar collaboration

Primary author

Presentation materials