Massive color-octet bosons and pairs of resonances at hadron colliders

Abstract

We analyze collider signatures of massive color-octet bosons whose couplings to quarks are suppressed. Gauge invariance forces the octets to couple at tree level only in pairs to gluons, with a strength set by the QCD gauge coupling. For a spin-1 octet, the cross section for pair production at hadron colliders is larger than that for a quark of equal mass. The octet decays into two jets, leading to a 4-jet signature with two pairs of jets forming resonances of the same mass. For a spin-0 octet the cross section is smaller, and the dominant decay is into b\bar{b}, or t\bar{t} if kinematically allowed. We estimate that discovery of spin-1 octets is possible for masses up to 330 GeV at the Tevatron, and 1 TeV at the LHC with 1 fb^{-1}, while the reach is somewhat lower for spin-0 octets.

5 pages, 3 ps figures. v2: minor changes, figures 3 and 4 replaced and references added; v3 (appeared in Phys. Lett. B): explanation of model expanded; added figure containing invariant mass distributions for signal and background at the LHC; reach for spin-0 octet reduced slightly by requiring at least 10 signal events

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