Jonathan L. Rosner
Professor, Physics Department, the Enrico Fermi Institute, and the College, University of Chicago
Ph.D., Physics, Princeton, 1965
Phone: (773) 702-7694
WWW: Web Site
Recent experiments at Fermilab and CERN and some non-accelerator experiments (including measurements of parity violation in atoms) have permitted tests of the theory of electroweak interactions with unprecedented accuracy. Studies are in progress to determine how these experiments shed light on new physics in the mass range of 100 GeV to several TeV.
A parallel line of investigation deals with the weak couplings of quarks to one another, as parametrized by the Cabibbo-Kobayashi-Maskawa (CKM) matrix. Various ways of learning these couplings more precisely are being studied. A key role is played by experiments on decays of mesons containing the "charm" and "bottom" (or "beauty") quarks. Present data on the violation of CP symmetry (the combination of charge and space inversion) in decays of these mesons are used to sharpen information on magnitudes and phases of CKM matrix elements and to search for new physics if and when inconsistencies are encountered.
Other topics being investigated include properties of systems involving one or more charm and bottom quarks, the nature of dark matter, the possibility that quarks and leptons have a composite structure, the role of neutrino masses in understanding fermion masses and couplings, the possibility of detecting new quarks and leptons with unusual quantum numbers as predicted in certain unified theories of the electroweak and strong interactions, and the experimental signatures of gauge theories beyond the standard SU(3) X SU(2) X U(1) electroweak-strong theory.
Rosner has performed an experiment to search for and study radio-frequency (RF) pulses accompanying cosmic ray air showers. He hopes to use experience in these studies to instrument the proposed Northern Hemisphere Auger Giant Air Shower Detector with the capability of RF pulse detection. Since 2003 he has been a member of the CLEO Collaboration studying electron-positron collisions at Cornell, with particular focus on the spectroscopy of heavy charm-anticharm and bottom-antibottom mesons.
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