PSAS 2012
International Conference on Precision Physics
of Simple Atomic Systems 2012
Eltville, Germany -
Information

Title:	Prof.
Family Name:	Adkins
First Name:	Greg
Gender:	male
E-Mail:	gadkinsfandm.edu
Affiliation for Badge:	Franklin & Marshall College
Institute:
Address (Street):	P.O. Box 3003
Postal Code, City:	Lancaster, 17604
Country:	United States
Phone:	1 717-371-8610
Fax:	1 717-358-4474
Arrival Date:	June 10
Departure Date:	June 15
Excursion with Conference Dinner:	Selected
Payment:	Bank transfer to GSI
Title:	Lorentz and CPT Violating Effects in Hydrogen and Positronium
Abstract:	The Standard Model Extension (SME) is an effective theory modeling the effect on standard physics of a more general high-energy fundamental theory. The effective interaction involves the usual quantum fields describing the photon, electron, etc., but with additional interactions containing a number of parameters. These novel interactions give rise to small violations of Lorentz and CPT symmetry. We have studied the effect of the SME on the energy levels of hydrogen and the decay properties of positronium. Hydrogen studies are interesting because the energy levels of hydrogen can be measured with great precision. We have found the SME corrections to the hydrogen energy levels at orders $\alpha^0$ and $\alpha^2$ times the SME parameters. Positronium is an exceptionally simple bound state. It is an eigenstate of C and of P composed of point-like electrons and positrons bound by the electromagnetic force with little contamination from the strong or weak interactions. We have studied the SME-mediated decays of positronium to the ``wrong'' number of photons, and have explored the contributions of the SME to photon correlations in the three-photon decay of orthopositronium.

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