/ Experiment-HEP hep-ex/0106012

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

Affolder, Anthony Allen ; Akimoto, H. ; Akopian, A. ; Albrow, Michael G. ; Amaral, P. ; Amidei, Dante E. ; Anikeev, K. ; Antos, J. ; Apollinari, G. ; Arisawa, T. ; Artikov, A. ; Asakawa, T. ; Ashmanskas, William Joseph ; Azfar, F. ; Azzi-Bacchetta, P. ; Bacchetta, Nicola ; Bachacou, Henri ; Bailey, S. ; de Barbaro, Pawel ; Barbaro-Galtieri, Angela ; Barnes, V.E. ; Barnett, Bruce A. ; Baroiant, S. ; Barone, M. ; Bauer, G.

Published in: Phys.Rev.
Year: 2002
Vol.: D65
Page No: 052006
Pages: 40

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 85pb of ppbar 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, mu and tau), and additional b quarks. We find no evidence for any anomalous production of gamma-b or gamma-b+X events. We present limits on two supersymmetric models: a model where the photon is produced in the decay chi2->gamma chi1, and a model where the photon is produced in the neutralino decay into the Gravitino LSP, chi1 -> gamma G. We also present our limits in a model-independent form and test methods of applying model-independent limits.

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