Dear Friends, On Thursday, October 18, there will be an ITAMP topical lunch discussion. Tea Room (P-226) @ CfA (60 Garden Street) Time: 12:00-1:30 As always pizza will be served. Speaker: Nick Hutzler Title: The ACME Electron Electric Dipole Moment Experiment Abstract: Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit [1,2] would be an indication of symmetry violation [3] that could not be explained within the Standard Model of particle physics. The ACME Collaboration [4] is searching for an electron EDM by performing a precision measurement of electron spin precession signals from the metastable H (^3\Delta_1) state of thorium monoxide (ThO), using a cold and slow beam produced by a novel source [5]. We will discuss the current status of the experiment, including a discussion of statistical and systematic uncertainty. [1] doi:10.1038/nature10104 [2] doi:10.1103/PhysRevLett.88.071805 [3] Purcell, E. M., & Ramsey, N. F. (1950), Phys. Rev., 78, 807. [4] doi:10.1088/0953-4075/43/7/074007 [5] doi:10.1039/c1cp20901a Looking forward to seeing you there, Misha Lemeshko -- Dr. Mikhail Lemeshko Institute for Theoretical Atomic, Molecular, and Optical Physics (ITAMP) Harvard-Smithsonian Center for Astrophysics MS-14 60 Garden St. Cambridge, MA 02138 U.S.A. mlemeshko(a)cfa.harvard.edu http://sites.google.com/site/mishalemeshko/ Tel. +1 (617) 496-7610 Fax +1 (617) 496-7668