Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Fundamentale Symmetrien
HK 28.1: Group Report
Tuesday, March 5, 2013, 14:00–14:30, HSZ-103
Measurement of Electric Dipole Moments of Charged Particles in Storage Rings — •Jörg Pretz — RWTH Aachen University, FZ Jülich
Permanent Electric Dipole Moments (EDMs) of fundamental particles violate both time invariance and parity symmetry. Assuming that the CPT theorem holds this implies also CP violation. The CP violation of the Standard Model is orders of magnitude too small to be observed experimentally in EDMs in the foreseeable future. It is also way too small to explain the asymmetry in abundance of matter and anti-mattter in our Universe. Hence, other CP violating mechanisms outside the realm of the Standard Model are searched for and could result in measurable EDMs.
EDM experiments with charged hadrons are proposed at storage rings where polarized particles are exposed to an electric field. If an EDM exists the spin vector will experience a torque resulting in a change of the original spin direction which can be determined with the help of a polarimeter. Although the principle of the measurement is simple, the smallness of the expected effect makes this a challenging experiment requiring new developments in various experimental areas.
Complementary efforts to measure EDMs of proton, deuteron and light nuclei are pursued at Brookhaven National Laboratory and at Forschungszentrum Jülich with with an ultimate goal to reach a sensitivity of 10−29e·cm.