Abstract
A new experiment is described to detect a permanent electric dipole moment of the proton with a sensitivity of 10-29 e ⋅ cm by using polarized "magic" momentum 0.7 GeV/c protons in an all-electric storage ring. Systematic errors relevant to the experiment are discussed and techniques to address them are presented. The measurement is sensitive to new physics beyond the standard model at the scale of 3000 TeV.
Highlights
One of the outstanding problems in contemporary elementary particle physics and cosmology is finding an explanation for the observed matter-antimatter asymmetry of our universe, known as baryogenesis
The method we describe is based on the frozen spin method and uses an all-electric lattice, directly measuring the spin precession due to a non-zero electric dipole moments (EDMs) in an electric field
We are currently developing prototypes to optimize the critical systems of the experiment, which include magnetic shielding, SQUID-based Beam position monitors (BPMs), polarimeter, and electric field plates
Summary
One of the outstanding problems in contemporary elementary particle physics and cosmology is finding an explanation for the observed matter-antimatter asymmetry of our universe, known as baryogenesis. Observing the EDM from different simple systems is necessary to identify the source of any NP.6 This dedicated direct proton EDM study at the level of 10−29 e · cm is sensitive to a generic NP mass scale ΛNP with CP-violating phase φNP roughly satisfying (3000 TeV/ΛNP) tan(φNP) > 1. A more timely illustration in the current LHC (the Large Hadron Collider at CERN in Switzerland) era is a potential CP-violating chiral phase induced by a loop induced Higgs to 2-photon coupling (the relative pseudoscalar to scalar amplitudes, a measure of potential Higgs CP-violation) Such an effective coupling would lead to fermion EDMs via quantum loops, making for an overall effect of 2-loop order.
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