Giving top quark effective operators a boost

Englert, Christoph; Moore, Liam; Russell, Michael; Nordström, Karl

doi:10.1016/j.physletb.2016.10.021

Article
Report number	arXiv:1607.04304
Title	Giving top quark effective operators a boost
Author(s)	Englert, Christoph (Glasgow U. ; SUPA, UK) ; Moore, Liam (SUPA, UK ; Glasgow U. ; CERN) ; Nordström, Karl (Glasgow U. ; SUPA, UK ; U. Heidelberg, ITP) ; Russell, Michael (SUPA, UK ; Glasgow U. ; U. Heidelberg, ITP)
Publication	2016-12-10
Imprint	14 Jul 2016
Number of pages	7
Note	Comments: 9 pages, 5 figures Published version
In:	Phys. Lett. B 763 (2016) 9-15
DOI	10.1016/j.physletb.2016.10.021
Subject category	Particle Physics - Phenomenology
Abstract	We investigate the prospects to systematically improve generic effective field theory-based searches for new physics in the top sector during LHC run 2 as well as the high luminosity phase. In particular, we assess the benefits of high momentum transfer final states on top EFT-fit as a function of systematic uncertainties in comparison with sensitivity expected from fully-resolved analyses focusing on $t\bar t$ production. We find that constraints are typically driven by fully-resolved selections, while boosted top quarks can serve to break degeneracies in the global fit. This demystifies and clarifies the importance of high momentum transfer final states for global fits to new interactions in the top sector from direct measurements.
Copyright/License	arXiv nonexclusive-distrib. 1.0 publication: © 2016-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³

$Transverse momentum distributions for the reconstructed hadronic top quark candidate. The bars represent 30~\ifb of pseudodata with \sqrts = 13 \tev constructed with the SM-only hypothesis, while the shaded curves include the effects of four-quark operators with Wilson coefficients $C_i = 10 $ TeV$^{-2}$ for illustration. Details of the top quark reconstruction are described in the text.$ $Individual 95\%~bounds on the operators considered here, from the boosted analysis and the resolved fat jet analysis, and the combined constraint from both, assuming 20\%~systematics and 30~\ifb of data. We also show existing constraints from unfolded 8 TeV $p_T$ distributions published in~\cite{Khachatryan:2015oqa} and~\cite{Aad:2015mbv}, showing the sizeable improvement even for a modest luminosity gain.$ $Individual 95\%~bounds on the operators considered here, from the boosted analysis and the resolved fat jet analysis, and the combined constraint from both, assuming 20\%~systematics and 30~\ifb of data. We also show existing constraints from unfolded 8 TeV $p_T$ distributions published in~\cite{Khachatryan:2015oqa} and~\cite{Aad:2015mbv}, showing the sizeable improvement even for a modest luminosity gain.$ Show more plots

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