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A novel comparison of Moller and Compton electron-beam polarimeters
Magee, JA Narayan, A Jones, D Beminiwattha, R Cornejo, JC Dalton, MM Deconinck, W Dutta, D Gaskell, D Martin, JW
Magee, JA
Narayan, A
Jones, D
Beminiwattha, R
Cornejo, JC
Dalton, MM
Deconinck, W
Dutta, D
Gaskell, D
Martin, JW
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2017-03-10
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10.1016/j.physletb.2017.01.026
Abstract
We have performed a novel comparison between electron-beam polarimeters based
on M{\o}ller and Compton scattering. A sequence of electron-beam polarization
measurements were performed at low beam currents ($<$ 5 $\mu$A) during the
$Q_{\rm weak}$ experiment in Hall C at Jefferson Lab. These low current
measurements were bracketed by the regular high current (180 $\mu$A) operation
of the Compton polarimeter. All measurements were found to be consistent within
experimental uncertainties of 1% or less, demonstrating that electron
polarization does not depend significantly on the beam current. This result
lends confidence to the common practice of applying M{\o}ller measurements made
at low beam currents to physics experiments performed at higher beam currents.
The agreement between two polarimetry techniques based on independent physical
processes sets an important benchmark for future precision asymmetry
measurements that require sub-1% precision in polarimetry.
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Elsevier BV
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PHYSICS LETTERS B
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