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David Rubin

Boyce D. McDaniel Professor of Physics
Director, Laboratory for Elementary-Particle Physics (LEPP)
(faculty bio)


Welcome to the website of the Laboratory for Elementary-Particle Physics at Cornell University. I would like to take this opportunity to share with you some of the activities going on at our lab, and to invite you to explore the information throughout this site.

Physicists at the Cornell Laboratory for Elementary Particle Physics (LEPP) study the fundamental building blocks of nature and the forces that govern them. At the energy frontier, LEPP experimentalists are collaborators on the CMS experiment at the Large Hadron Collider (LHC), searching for new particles in the collisions of multi TeV proton beams. In the debris of those collisions they search for clues to the origin of electroweak symmetry breaking, the existence of dark matter, and the hypothesized supersymmetric partners of the quarks and leptons. A couple of us are involved in experiments to test the Standard Model at the intensity frontier with precision measurements of muon g-2 and the electric dipole moment of the proton. Still others continue to sift through the proton - anti-proton colliding beam data from the Tevatron, for hints of new physics.

Meanwhile, LEPP accelerator scientists are anticipating the beam physics and developing the technology of the accelerator that will someday complement the LHC, a linear electron positron collider (ILC) or perhaps a muon collider. There is an active beam physics R&D program to explore the properties of the ultra-low emittance damping rings that will cool the particle/anti-particle beams in preparation for acceleration and finally collision at high energy. The 5 GeV electron/positron collider (CESR) at Wilson Lab, that is the laboratory for these studies, has been configured and instrumented as a damping ring test accelerator. The SRF group studies the basic phenomena and application of RF superconductivity for particle accelerators. Superconducting radio frequency cavities will be an essential ingredient of any lepton collider. LEPP physicists are also investigating the properties of high brightness electron sources. The ERL photoinjector is a testbed for developing new technical solutions and novel approaches.

The LEPP theory group pursues research on string theory, string cosmology, physics beyond the standard model, collider physics, flavor physics, lattice gauge theory, particle astrophysics, and applications of quantum field theory to condensed matter systems. LEPP theorists are anxiously awaiting analysis of the LHC data. Every search, whether it yields a new particle, or sets an upper limit, provides evidence leading to the emergence of some models, and the demise of others.

Work at LEPP is connected to other scientific fields through the Cornell High Energy Synchrotron Source (CHESS), an x-ray facility at CESR. Cornell accelerator physicists are developing the technology for an x-ray source called the Energy Recovery Linac (ERL) , which would be about 1000 times brighter than existing comparable facilities, and would have broad application in biology, geology, medical science and many other fields. With NSF support, the accelerator group is prototyping key elements, working toward the goal of constructing the ERL at Cornell.

David Rubin
Ithaca, NY
July, 2011