Search for New Physics with a Single Top Quark Signature in the Boosted All Hadronic Final State
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Date
2015-02-20
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Johns Hopkins University
Abstract
We present two searches for massive resonances decaying with a single top-quark signature.
First, we present a search for the W' boson decaying to a top and bottom quark, then a search for the singly produced b*
quark decaying to a top quark and W boson.
The data analysed for these searches corresponds to an integrated luminosity of 19.7 inverse femptobarns collected by the CMS detector in proton-proton collisions at a collision energy of 8 TeV.
The use of cutting edge jet substructure algorithms allows the top quark jet to be distinguished from standard model hadronic jet backgrounds and is the central feature of these analyses.
We set 95% C.L. limits on the production cross section of a right-handed W' boson,
together with constraints on the left and right-handed couplings of the W' boson to quarks. The production of a right-handed W' boson with a mass below
2.02 TeV decaying to an all-hadronic final state is excluded. This mass limit increases to 2.15 TeV when both all-hadronic
and semileptonic decays are considered.
Additionally, limits on the production cross section of the right-handed, left-handed, and vectorlike b* quark boson are obtained.
The masses of the left-handed, right-handed and vectorlike b*-quark states are excluded in the range of 880-1390 GeV, 820-1430 GeV, and 800-1530 GeV respectively when considering the all-hadronic channel only.
The masses of the left-handed, right-handed and vectorlike b*-quark states are excluded below 1390, 1420 and 1520 GeV when considering the combined all-hadronic, semileptonic, and dileptonic channels.
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Keywords
physics, LHC