We report results from a study of events with a leading antiproton of beam

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T. AFFOLDER et al.PHYSICAL REVIEW D 65 052006 052006-2We have searched for evidence of physics beyond the standard model in events that include an energetic photon and an energetic b-quark jet, produced in 85 pb Ϫ1 of p p collisions at 1.8 TeV at the Tevatron Collider at Fermilab. This signature, containing at least one gauge boson and a third-generation quark, could arise in the production and decay of a pair of new particles, such as those predicted by supersymmetry, leading to a production rate exceeding standard model predictions. We also search these events for anomalous production of missing transverse energy, additional jets and leptons (e, and ), and additional b quarks. We find no evidence for any anomalous production of ␥b or ␥bϩX events. We present limits on two supersymmetric models: a model where the photon is produced in the decay 2 0 →␥ 1 0 , and a model where the photon is produced in the neutralino decay into the gravitino LSP, 1 0 →␥G . We also present our limits in a modelindependent form and test methods of applying model-independent limits.

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The results of the searches for neutral Higgs boson production in the process e+e---+ Z* Ho are reported, focusing on Higgs boson masses below 70 GeV. The data sample consists of three million hadronic Z" decays collected by the L3 experiment at LEP from 1991 through 1994. No signal is found leading to a lower limit on the mass of the Standard Model Higgs boson of 60.2 GeV at 95% C.L.These results are also interpreted in the framework of the General Two Doublet Model and limits on the nonstandard Higgs boson production through the process e + -e 4 Z* ho are set. A lower limit of 66.7 GeV at 95% CL. is obtained for the case where the Higgs decays into an invisible final state.