Abstract
Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |d_e| < 1.05 e -27 e cm would be an indication of physics beyond the Standard Model. The ACME Collaboration is searching for an electron EDM by performing a precision measurement of electron spin precession in the metastable H state of thorium monoxide (ThO) using a slow, cryogenic beam. We discuss the current status of the experiment. Based on a data set acquired from 14 hours of running time over a period of 2 days, we have achieved a 1-sigma statistical uncertainty of 1 e -28 e cm/T^(1/2), where T is the running time in days.
Highlights
At accelerators such as the Large Hadron Collider (LHC), particles of the highest accessible energies are used to probe physics at its most fundamental level
The Advanced Cold Molecule EDM Experiment (ACME) Collaboration is searching for an electron electric dipole moment (EDM) by performing a precision measurement of electron spin precession in the metastable H 3 1 state of thorium monoxide (ThO) using a slow, cryogenic beam
Taking advantage of recent improvements in technologies and methods, including a new slow, cold, and intense beam source [14] and ThO’s near-ideal 3 1 state structure, we have developed an experiment with the unprecedented electron EDM statistical sensitivity of about 1 × 10−28 e · cm in one day of averaging time
Summary
At accelerators such as the Large Hadron Collider (LHC), particles of the highest accessible energies are used to probe physics at its most fundamental level. An electron EDM measurement that is 10–100 times as sensitive as the current upper bound must either observe an EDM, revealing a breakdown of the Standard Model, or set a new limit requiring such unnatural suppression of supersymmetric parameters that many supersymmetric models would have to be revised or rejected [9]. We are currently studying various possible sources of systematic error in preparation for reporting a new result
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