Searches for new physics in events with a photon and b-quark jet at CDF

Authors

T. Affolder, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Collider Detector at Fermilab Collaboration

Date of this Version

3-1-2002

Comments

Published by American Physical Society. Phys. Rev. D 65, 052006 (2002). http://prd.aps.org. Copyright © 2002 American Physical Society. Permission to use.

Abstract

We 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^-1 of p̅p 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, μ and τ ), and additional b quarks. We find no evidence for any anomalous production of γb or γb+X events. We present limits on two supersymmetric models: a model where the photon is produced in the decay x̃₂⁰→ γx̃₁⁰, and a model where the photon is produced in the neutralino decay into the gravitino LSP, x̃₁⁰→γG̃ . We also present our limits in a modelindependent form and test methods of applying model-independent limits.