Bulletin of the American Physical Society
APS April Meeting 2013
Volume 58, Number 4
Saturday–Tuesday, April 13–16, 2013; Denver, Colorado
Session Y3: Invited Session: New EDM Results and Their Implications |
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Sponsoring Units: DNP DPF Chair: Douglas Beck, University of Illinois at Urbana-Champaign Room: Plaza E |
Tuesday, April 16, 2013 1:30PM - 2:06PM |
Y3.00001: New results from the YbF EDM experiment Invited Speaker: B.E. Sauer The standard model of particle physics predicts that, due to time reversal symmetry, the permanent electric dipole moment (EDM) of the electron is very nearly zero. Many extensions to the standard model predict an electron EDM or other T-violating effects just below current experimental limits, thus there is great interest in new experiments and in improving current experimental precision. I will discuss our recent measurement of the electron EDM using YbF molecules. YbF is particularly sensitive to the electron EDM. This experiment uses a form of laser-radiofrequency double resonance spectroscopy to search for very small energy differences between hyperfine levels in a strong electric field. In addition to describing the experimental and analysis techniques, I will give an overview of the techniques we use to check for systematic errors. I will also describe planned improvements to the experiment which promise several orders of magnitude improvement in sensitivity. [Preview Abstract] |
Tuesday, April 16, 2013 2:06PM - 2:42PM |
Y3.00002: The ACME electron electric dipole moment search Invited Speaker: David DeMille Observation of a non-zero electric dipole moment (EDM) of the electron, $d_e$, within a few orders of magnitude of the current limit $|d_e| < 1.05 \times 10^{-27}~e\cdot$cm would be an indication of CP violation in physics beyond the Standard Model. Numerous extensions to the Standard Model predict a value of $d_e$ in this range. The ACME Collaboration is searching for an electron EDM, by performing a precision measurement of spin precession signals from electrons in thorium monoxide (ThO) molecules. In this molecule, the EDM experiences a large electric field ($\sim\! 100$ GV/cm) that amplifies the spin precession. In addition, several properties of the molecular state make it possible to suppress many anticipated sources of systematic error. Our experiment uses a slow, cryogenic molecular beam to achieve unprecedented statistical accuracy. We now routinely take data with a 1$\sigma$ statistical uncertainty of $\delta d_e \approx 1.0-1.5 \times 10^{-28}/\sqrt{T}~e\cdot$cm, where $T$ is the running time in days. We will present the current status of the experiment. [Preview Abstract] |
Tuesday, April 16, 2013 2:42PM - 3:18PM |
Y3.00003: EDMs and the LHC: Implications of Recent Results Invited Speaker: Michael Ramsey-Musolf The search for permanent electric dipole moments (EDMs) of leptons, nucleons, atoms, and molecules provides a powerful probe of CP violation both within and beyond the Standard Model. When combined with the results of new particle searches at the LHC, recent EDM search results are also testing the possibility that new TeV scale, CP-violating interactions may be responsible for the cosmic baryon asymmetry. In this talk, I discuss the implications of these results, as well as of recent theoretical work, for the origin of baryonic matter. I also comment on alternate probes provided by studies of CP-violating observables in the heavy flavor sector. [Preview Abstract] |
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