Search for New Particles Decaying to b bbar in p pbar Collisions at sqrts=1.8 TeV

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We have used 87 pb-1 of data collected with the Collider Detector at Fermilab to search for new particles decaying to b bbar. We present model-independent upper limits on the cross section for narrow resonances which excludes the color-octet technirho in the mass interval 350 < M < 440 GeV/c². In addition, we exclude topgluons, predicted in models of topcolor-assisted technicolor, of width Gamma = 0.3 M in the mass range 280 < M < 670 GeV/c², of width Gamma = 0.5 M in the mass range 340 < M < 640 GeV/c², and of width Gamma = 0.7 M in the mass range 375 < M < 560 GeV/c².