Professor Lorenzon works in medium and high-energy hadronic physics as a member of the Seaquest collaboration at Fermilab and the HERMES collaboration at DESY. He has served as a Deputy Spokesman for HERMES from 1997-1998. From 1995-2007, the HERMES experiment has provided fundamental new insights into the spin structure as well as into the general structure of the nucleon and how it is affected by the nuclear medium, using the 27.5 GeV HERA electron storage ring. For the Seaquest experiment, he is building the cryogenic targets and will study the antiquark distribution in the nucleon sea to gain a better understanding of the model that describes nucleons. The Drell/Yan experiment at Fermilab is tentatively scheduled for summer 2010.
He is involved in planning for two projects designed to study the nature of the dark energy that drives the accelerated expansion of the universe: the Joint Dark Energy Mission (JDEM) and the Dark Energy Survey (DES). The JDEM project is a very ambitious project to construct and operate a new 2-meter class wide-field space telescope to map the expansion history of the universe, reaching back two-thirds of the age of the universe. The DES is a project that is constructing a large new camera for the 4-meter telescope at the Cerro Tololo Inter-American Observatory in Chile. JDEM and DES will implement a supernovae and weak gravitational lensing program to place the strongest possible constraints on dark energy.
Furthermore, Professor Lorenzon is also engaged in a measurement to study physics beyond the standard model of elementary particle interactions with the Radon-EDM experiment. One important pursuit is the search for the CP-violating electric dipole moments of heavy atoms, a problem closely related to understanding the apparent cosmological dominance of matter over antimatter. In this work, physics at short range is studied using symmetry and precision measurement techniques accessible with spin polarized systems. Rare isotope, e.g. 223-Rn, are used because large enhancements are expected due to the octupole deformation of the nucleus.
Professor Lorenzon is a Fellow of the American Physical Society.
Measurement of Parton Distributions of Strange Quarks in the Nucleon From Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron, (A. Airapetian et al., HERMES Collaboration), Phys. Lett. B 666, 446 (2008).
Polarization and Relaxation Rates of Radon, (E.R. Tardiff et al., RadonEDM collaboration), Phys. Rev. C 77 052501(R), (2008).
Sub-Pixel Response Measurement of Near-Infrared Sensors, (N. Barron et al., Michigan NIR Laboratory), Publ. Astron. Soc. Pac. 119, 466 (2007).
Precise Determination of the Spin Structure Function g_1 of the Proton, Deuteron, and Neutron, (A. Airapetian et al., HERMES Collaboration), Phys. Rev. D 75, 012007 (2007).
Weak Lensing From Space I: Instrumentation and Survey Strategy, (J. Rhodes et al., SNAP Collaboration), Astropart. Phys. 20, 377 (2004).