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In a search for new phenomena in a signature suppressed in the standard modelof elementary particles (SM), we compare the inclusive production of eventscontaining a lepton, a photon, significant transverse momentum imbalance (MET),and a jet identified as containing a b-quark, to SM predictions. The searchuses data produced in proton-antiproton collisions at 1.96 TeV corresponding to1.9 fb-1 of integrated luminosity taken with the CDF detector at the FermilabTevatron. We find 28 lepton+photon+MET+b events versus an expectation of31.0+4.1/-3.5 events. If we further require events to contain at least threejets and large total transverse energy, simulations predict that the largest SMsource is top-quark pair production with an additional radiated photon,ttbar+photon. In the data we observe 16 ttbar+photon candidate events versus anexpectation from SM sources of 11.2+2.3/-2.1. Assuming the difference betweenthe observed number and the predicted non-top-quark total is due to SM topquark production, we estimate the ttg cross section to be 0.15 +- 0.08 pb.

Searching the Inclusive Lepton + Photon + Missing ET + b-quark Signature for Radiative Top Quark Decay and Non-Standard-Model Processes