2013 Spring High Energy Particle Physics Seminar: Dr. Karen Bland

DateApril 15, 2013Time3:30 - 5:00 pm
LocationBaylor Sciences Building, Room A.202
Description
Karen Bland, Ph. D.
Baylor University

Search for Rare Z Decays into Two Reconstructed Photons at CDF

We report the most sensitive search to date for forbidden and exotic decays of the Z boson to a pair of photons, a pair of neutral mesons, or a neutral meson and a photon. The search is using the full CDF dataset corresponding to 10.0 fb-1 of integrated luminosity. The two decay products are reconstructed in the electromagnetic calorimeter, spanning a rapidity range of || < 1.1, and their momenta are used to reconstruct the invariant mass of the pair that is used to identify Z bosons. Bayesian 95% C.L. limits on the signal branching ratio are derived by fitting the signal and background expectations to the data in the Z-mass window of [80,102] GeV/c2. The observed branching ratio limits presented here are 1.66~10−5 for Z, 2.28~10−5 for Z0, and 1.73~10−5 for Z00. The Z and Z0 limits are more sensitive by factors of 3.1 and 2.3, respectively, than the most stringent Particle Data Group limits reported by experiments at the LEP collider. The Z00 branching ratio limit is the first limit reported in this decay mode.

For more information, please contact: Dr. Jay Dittmann 254-710- 2275

PublisherDepartment of Physics
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