Search for pair production of heavy top-like quarks decaying to a high-pT W boson and a b quark in the lepton plus jets final state at sqrts=7 TeV with the ATLAS detector

ATLAS, Collaboration; Agustoni, Marco; Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Weber, Michael (2013). Search for pair production of heavy top-like quarks decaying to a high-pT W boson and a b quark in the lepton plus jets final state at sqrts=7 TeV with the ATLAS detector. Physics letters. B, 718(4-5), pp. 1284-1302. Elsevier 10.1016/j.physletb.2012.11.071

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A search is presented for production of a heavy up-type quark (t') together with its antiparticle, assuming a significant branching ratio for subsequent decay into a W boson and a b quark. The search is based on 4.7 fb(-1) of pp collisions root s = 7 TeV recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton + jets final state, characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum and at least three jets. The analysis strategy relies on the substantial boost of the W bosons in the t'(t') over bar signal when m(t') greater than or similar to 400 GeV. No significant excess of events above the Standard Model expectation is observed and the result of the search is interpreted in the context of fourth-generation and vector-like quark models. Under the assumption of a branching ratio BR(t' -> W b) = I, a fourth-generation t' quark with mass lower than 656 GeV is excluded at 95% confidence level. In addition, in light of the recent discovery of a new boson of mass similar to 126 GeV at the LHC, upper limits are derived in the two-dimensional plane of BR(t' -> Wb) versus BR(t' -> Ht), where H is the Standard Model Higgs boson, for vector-like quarks of various masses.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Agustoni, Marco; Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kruker, Tobias; Marti, Lukas; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

0370-2693

Publisher:

Elsevier

Language:

English

Submitter:

Andrea Stettler

Date Deposited:

17 Sep 2014 11:15

Last Modified:

09 Jan 2015 06:22

Publisher DOI:

10.1016/j.physletb.2012.11.071

Web of Science ID:

000314554300014

ArXiv ID:

1210.5468v1

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.58467

URI:

https://boris.unibe.ch/id/eprint/58467

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