Search for heavy quarks decaying into a top quark and a W or Z boson using lepton + jets events in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports a search for heavy quarks decaying into top quarks and W or Z bosons in proton-proton collisions, setting mass exclusion limits up to 675 GeV based on CMS data at 7 TeV.

Contribution

The study provides the first experimental limits on heavy quark pair-production decaying into tW or tZ at 7 TeV using lepton + jets events.

Findings

No significant excess observed over standard model predictions.

Heavy quarks with masses below 675 GeV (tW) and 625 GeV (tZ) are excluded.

Results improve constraints on new heavy quark models.

Abstract

Results are presented from a search for the pair-production of heavy quarks, Q Q-bar, that decay exclusively into a top quark and a W or Z boson. The search is performed using a sample of proton-proton collisions at sqrt(s) = 7 TeV corresponding to an integrated luminosity of 5.0 inverse femtobarns, collected by the Compact Muon Solenoid experiment. The signal region is defined using a sample of events containing one electron or muon, missing transverse momentum, and at least four jets with large transverse momenta, where one jet is likely to originate from the decay of a bottom quark. No significant excess of events is observed with respect to the standard model expectations. Assuming a strong pair-production mechanism, quark masses below 675 (625) GeV decaying into tW (tZ) are excluded at the 95% confidence level.