Search for heavy, long-lived neutralinos that decay to photons at CDF II using photon timing
- Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)
We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via {chi}-tilde{sub 1}{sup 0}{yields}{gamma}G-tilde in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570{+-}34 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV, we select {gamma}+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. We find 2 events, consistent with the background estimate of 1.3{+-}0.7 events. While our search strategy does not rely on model-specific dynamics, we set cross section limits and place the world-best 95% C.L. lower limit on the {chi}-tilde{sub 1}{sup 0} mass of 101 GeV/c{sup 2} at {tau}{sub {chi}}-tilde{sub 1{sup 0}}=5 ns.
- OSTI ID:
- 21250589
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 3; Other Information: DOI: 10.1103/PhysRevD.78.032015; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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