Search for W' -> tb -> qqbb decays in pp collisions at root s=8 TeV with the ATLAS detector

Aad, G. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S and Abramowicz, H. and Abreu, H. and Abreu, R. and Abulaiti, Y. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Adelman, J. and Adomeit, S. and Adye, T. and Agatonovic-Jovin, T. and Aguilar-Saavedra, J. A. and Agustoni, M. and Ahlen, S. P. and Ahmadov, F. and Aielli, G. and Akerstedt, H. and Akesson, T. P. A. and Akimoto, G. and Akimov, A. V. and Alberghi, G. L. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Search for W' -> tb -> qqbb decays in pp collisions at root s=8 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 75 (4). ISSN 1434-6044

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Abstract

A search for a massive W0 gauge boson decaying to a top quark and a bottom quark is performed with the ATLAS detector in pp collisions at the LHC. The dataset was taken at a centre-of-mass energy of √ s = 8 TeV and corresponds to 20.3 fb−1 of integrated luminosity. This analysis is done in the hadronic decay mode of the top quark, where novel jet substructure techniques are used to identify jets from high-momentum top quarks. This allows for a search for high-mass W0 bosons in the range 1.5−3.0 TeV. b-tagging is used to identify jets originating from b-quarks. The data are consistent with Standard Model background-only expectations, and upper limits at 95% confidence level are set on the W0 → tb cross section times branching ratio ranging from 0.16 pb to 0.33 pb for left-handed W0 bosons, and ranging from 0.10 pb to 0.21 pb for W0 bosons with purely right-handed couplings. Upper limits at 95% confidence level are set on the W0 -boson coupling to tb as a function of the W0 mass using an effective field theory approach, which is independent of details of particular models predicting a W0 boson.

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