Search for down-type fourth generation quarks with the ATLAS Detector in events with one lepton and hadronically decaying W bosons

ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Lugar: New York; Año: 2012 vol. 213 p. 1 - 23

0031-9007

This Letter presents a search for pair production of heavy down-type quarks decaying via b´->Wt in the lepton + jets channel, as b´b´->WtWt->bbWWWW->lvbbqqqqqq. In addition to requiring exactly one lepton, large missing transverse momentum and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04 fb^-1 from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480 GeV is excluded at the 95% confidence level.