The PRad experiment at JLab
Maxime Levillain
Vendredi 01/09/2017, 11h00-12h00
Bat 703, p 135 salle visio-conférence, CEA Saclay, Orme des Merisiers

The latest measurements of the proton radius through muonic hydrogen Lamb shift show a discrepancy of about 7sigma  from a global analysis of standard hydrogen Lamb shift and elastic ep-scattering. In order to understand this proton radius puzzle, the PRad experiment1 , that was designed through an independent method, successfully performed in June 2016, taking elastic ep  and Møller-scattering data with rich statistics on a wide Q2  range including very low momentum transfer (Q2 ∈  [10-4;  10-1 ] GeV2 ) with very accurate angle and energy measurements to minimize the systematic uncertainties.

We will present in this seminar the framework around this proton radius puzzle  and how the specic setup of the PRad experiment is designed to improve the previous measurements on elastic ep -scattering cross-sections. This talk will be completed by a characterization of both detectors used in this experiment: a hybrid calorimeter (HyCal) and a plane of two GEM detectors. Finally we will show the current status of the data analysis toward the extraction of the proton radius and the latest preliminary ep  cross-sections from this experiment.


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