München 2009 – scientific programme
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T: Fachverband Teilchenphysik
T 41: CP-Verletzung und Mischungswinkel
T 41.2: Talk
Friday, March 13, 2009, 14:20–14:35, A119
A novel approach to measure the electric dipole moment of 129-Xenon — Peter Fierlinger and •Florian Kuchler — TU München, Excellence Cluster Universe, Garching
Since the 1950’s people search for electric dipole moments (EDM) of fundamental systems, an unambiguous manifestation of parity (P) and time reversal (T) symmetry violation. Although the Standard model (SM) predicts very small EDM values, extentions to the SM (eg. Supersymmetry) require large EDMs, which are within the reach of next generation experiments.
Besides the neutron as the most prominent example of an EDM search, diamagnetic atoms like 199-Hg set even stronger limits < 2.1/times 10−28 ecm. In this presentation we present a novel approach to measure the EDM of the diamagnetic atom 129-Xe by a novel method, based on liquid hyper-polarized 129-Xe droplets condensed in a micro-fabricated structure. Due to the large density of the liquid, the size of the experiments can be minimized, enabling a conceptually new stratey to measure an EDM by applying rotating electric fields in the spin-precession plane. This method, where the phase of the EDM and the Larmor-precession are independent effects, can be used in addition to the ’conventional’ Ramsey technique to cross-check for systematic effects. Due to the small size of the experiment, also stability and gradients of the magnetic field can be controlled on an unprecedented level, using low-temperature SQUID magnetometry. Systematic effects, in particular motional effects, are controlled by performing an array of experiments in parallel on the same chip with different conditions.