Search for W ' -> tb -> qqbb decays in pp collisions at root s=8 TeV with the ATLAS detector
Number of Authors: 2892
2015 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, no 4, 165Article in journal (Refereed) Published
A search for a massive W' gauge boson decaying to a top quark and a bottom quark is performed with the ATLAS detector in pp collisions at the LHC. The datasetwas taken at a centre-of-mass energy of root 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 W' 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 W' -> tb cross section times branching ratio ranging from 0.16 pb to 0.33 pb for left-handed W' bosons, and ranging from 0.10 pb to 0.21 pb for W' bosons with purely righthanded couplings. Upper limits at 95% confidence level are set on the W'-boson coupling to tb as a function of the W' mass using an effective field theory approach, which is independent of details of particular models predicting a W' boson.
Place, publisher, year, edition, pages
2015. Vol. 75, no 4, 165
IdentifiersURN: urn:nbn:se:uu:diva-258560DOI: 10.1140/epjc/s10052-015-3372-2ISI: 000355671700005OAI: oai:DiVA.org:uu-258560DiVA: diva2:841935
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3372-22015-07-152015-07-152015-07-15Bibliographically approved