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Search for new particles in final states with a boosted top quark and missing transverse momentum in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

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Aad, G 
Abbott, B 
Abeling, K 
Abicht, NJ 
Abidi, SH 


jats:titleAjats:scbstract</jats:sc> </jats:title>jats:pA search for events with one top quark and missing transverse momentum in the final state is presented. The fully hadronic decay of the top quark is explored by selecting events with a reconstructed boosted top-quark topology produced in association with large missing transverse momentum. The analysis uses 139 fbjats:supjats:italic−</jats:italic>1</jats:sup> of proton-proton collision data at a centre-of-mass energy of jats:inline-formulajats:alternativesjats:tex-math$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml=""> mml:msqrt mml:mis</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV recorded during 2015-2018 by the ATLAS detector at the Large Hadron Collider. The results are interpreted in the context of simplified models for Dark Matter particle production and the single production of a vector-like jats:italicT</jats:italic> quark. Without significant excess relative to the Standard Model expectations, 95% confidence-level upper limits on the corresponding cross-sections are obtained. The production of Dark Matter particles in association with a single top quark is excluded for masses of a scalar (vector) mediator up to 4jats:italic.</jats:italic>3 (2jats:italic.</jats:italic>3) TeV, assuming jats:italicm</jats:italic>jats:subjats:italicχ</jats:italic></jats:sub> = 1 GeV and the model couplings jats:italicλ</jats:italic>jats:subjats:italicq</jats:italic></jats:sub> = 0jats:italic.</jats:italic>6 and jats:italicλ</jats:italic>jats:subjats:italicχ</jats:italic></jats:sub> = 0jats:italic.</jats:italic>4 (jats:italica</jats:italic> = 0jats:italic.</jats:italic>5 and jats:italicg</jats:italic>jats:subjats:italicχ</jats:italic></jats:sub> = 1). The production of a single vector-like jats:italicT</jats:italic> quark is excluded for masses below 1jats:italic.</jats:italic>8 TeV assuming a coupling to the top quark jats:italicκ</jats:italic>jats:subjats:italicT</jats:italic></jats:sub> = 0jats:italic.</jats:italic>5 and a branching ratio for jats:italicT → Zt</jats:italic> of 25%.</jats:p>



5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences

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Journal of High Energy Physics

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Springer Science and Business Media LLC