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Hbb? production in composite Higgs models

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摘要

New vectorlike quarks with electric charge 2/3 and -1/3 can be singly produced at hadron colliders through the exchange of a color octet vector resonance in models of strong electroweak symmetry breaking. We show that electroweak symmetry breaking effects can have a significant impact on the decay pattern of these new quarks. In particular, single production of charge -1/3 fermion resonances, mediated by a color octet vector resonance, typically results in an Hbb? final state with a sizeable cross section and very distinctive kinematics. We consider the leading H→bb? decay and show that the 4b signal can be very efficiently disentangled from the background: heavy octet masses of up to 3 TeV can be tested with the data already collected at the LHC and up to 5 TeV with an integrated luminosity of 100 fb-1 at √s=14 TeV. We also discuss the kinematical differences between the Hbb? production in models of strong electroweak symmetry breaking and supersymmetric models and the implications on the phenomenology of nonminimal composite Higgs models.

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