Production of heavy Higgs bosons and decay into top quarks at the LHC

Bernreuther, W., Galler, P. , Mellein, C., Si, Z.-G. and Uwer, P. (2016) Production of heavy Higgs bosons and decay into top quarks at the LHC. Physical Review D, 93(3), 034032. (doi:10.1103/PhysRevD.93.034032)

Bernreuther, W., Galler, P. , Mellein, C., Si, Z.-G. and Uwer, P. (2016) Production of heavy Higgs bosons and decay into top quarks at the LHC. Physical Review D, 93(3), 034032. (doi:10.1103/PhysRevD.93.034032)

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Abstract

We investigate the production of heavy, neutral Higgs boson resonances and their decays to top-quark top-antiquark (t<span style="text-decoration: overline">t</span>) pairs at the Large Hadron Collider (LHC) at next-to-leading order (NLO) in the strong coupling of quantum chromodynamics (QCD). The NLO corrections to heavy Higgs boson production and the Higgs-QCD interference are calculated in the large mt limit with an effective K-factor rescaling. The nonresonant t<span style="text-decoration: overline">t</span> background is taken into account at NLO QCD including weak-interaction corrections. In order to consistently determine the total decay widths of the heavy Higgs bosons, we consider for definiteness the type-II two-Higgs-doublet extension of the standard model and choose three parameter scenarios that entail two heavy neutral Higgs bosons with masses above the t<span style="text-decoration: overline">t</span> threshold and unsuppressed Yukawa couplings to top quarks. For these three scenarios we compute, for the LHC operating at 13 TeV, the ttbar cross section and the distributions of the tt¯ invariant mass, of the transverse top-quark momentum and rapidity, and of the cosine of the Collins-Soper angle with and without the two heavy Higgs resonances. For selected M<sub>t<span style="text-decoration: overline">t</span></sub> bins we estimate the significances for detecting a heavy Higgs signal in the t<span style="text-decoration: overline">t</span> dileptonic and lepton plus jets decay channels.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Galler, Dr Peter
Authors: Bernreuther, W., Galler, P., Mellein, C., Si, Z.-G., and Uwer, P.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Particle Physics Theory
Journal Name:Physical Review D
Journal Abbr.:PRD
Publisher:American Physical Society
ISSN:1550-7998
ISSN (Online):1550-2368
Published Online:23 February 2016
Copyright Holders:Copyright © 2016 American Physical Society
First Published:First published in Physical Review D 93(3): 034032
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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