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Ultra-High precision Compton polarimetry at 2 GeV

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arxiv 2402.16135 v1 pith:3LKZ5EKK submitted 2024-02-25 physics.ins-det nucl-ex

A. Zec , S. Premathilake , J. C. Cornejo , M. M. Dalton , C. Gal , D. Gaskell , M. Gericke , I. Halilovic
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H. Liu J. Mammei R. Michaels C. Palatchi J. Pan K. D. Paschke B. Quinn J. Zhang
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keywords comptonmeasurementbeamelectronmadepolarimetrypolarizationprecision
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We report a high precision measurement of electron beam polarization using Compton polarimetry. The measurement was made in experimental Hall A at Jefferson Lab during the CREX experiment in 2020. A total uncertainty of dP/P=0.36% was achieved detecting the back-scattered photons from the Compton scattering process. This is the highest accuracy in a measurement of electron beam polarization using Compton scattering ever reported, surpassing the ground-breaking measurement from the SLAC Large Detector (SLD) Compton polarimeter. Such uncertainty reaches the level required for the future flagship measurements to be made by the MOLLER and SoLID experiments.

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