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Precision $e^-$ Beam Polarimetry at an $e^+e^-$ B Factory using Tau-Pair Events
by Caleb Miller
Submission summary
| Authors (as registered SciPost users): | Caleb Miller |
| Submission information | |
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| Preprint Link: | scipost_202406_00020v1 (pdf) |
| Date submitted: | 2024-06-11 01:42 |
| Submitted by: | Miller, Caleb |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 17th International Workshop on Tau Lepton Physics (TAU2023) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
A novel technique for measuring the average beam polarization in $e^+e^-$ collisions, known as Tau Polarimetry, has been developed by the \babar~collaboration. This technique makes use of the relationship between the polarization of the beams, the resulting polarization of the $\tau^+\tau^-$ produced, and the kinematics of the decay products. Using this technique \babar~has measured the average $e^-$ beam polarization of PEP-II to be 0.0034 $\pm$ 0.0024$_{\textrm{stat}} \pm $0.0029$_{\textrm{sys}}$. This technique is expected to be used at Belle~II after a proposed polarization upgrade as the most precise method with which beam polarization can be determined.
Current status:
Reports on this Submission
Report #1 by Swagato Banerjee (Referee 1) on 2024-11-24 (Invited Report)
Report
The BaBar experiment measured the average beam polarization present in the PEP-II collider with a systematic uncertainty of 0.3%. Event sample containing tau decays to a rho meson and a neutrino is used for this measurement. The dominant uncertainties come from modeling of the neutral processes. This measurement provides a strong confirmation that Belle II experiment will meet or exceed the projected physics measurement sensitivities for the Chiral Belle upgrade.
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