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We have performed a search for radiative b-hadron decays using events produced in pp̄ collisions at √s=1.8 TeV and collected by the Collider Detector at Fermilab. The decays we considered were B̄d0 →K̄*0(→K -π+)γ, B̄s0→φ (→K+K-)γ, Λb0→Λ(→pπ-)γ, and their charge conjugates. Two independent methods to identify photons from such decays were employed. In the first method, the photon was detected in the electromagnetic calorimeter. In the second method, the photon was identified by an electron-positron pair produced through the external photon conversion before the tracking detector volume. By combining the two methods we obtain upper limits on the branching fractions for the B̄d0, B̄s0, and Λb0 radiative decays which, at the 95% confidence level, are found to be B(B̄ d0→K̄*0γ)<1. 4×10-4, B(B̄s0→φγ) <1.6×10-4, and B(Λb0→Λγ)<1.9×10-3. © 2002 The American Physical Society

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Search for radiativeb-hadron decays inpp¯collisions at