Study of ttbb and ttW background modelling for ttH analyses

(2) University at Freiburg Germany; (3) Karlsruhe Institut of Technology KIT Germany; (4) University of Sussex Great Britain; (5) Instituto de F\'isica Corpuscular Consejo Superior de Investigaciones Cient\'ificas Spain; (6) University at Hamburg Germany; (7) Institute of High Energy Physics; Andrea Knue (2); Andrej Saibel (5); China); Chinese Academy of Sciences

Study of ttbb and ttW background modelling for ttH analyses

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arxiv 2301.11670 v1 pith:VPU7KF6C submitted 2023-01-27 hep-ex hep-ph

Lars Ferencz (1) , Kirill Grevtsov (1) , Judith Katzy (1) , Andrea Knue (2) , Jan van der Linden (3) , Josh McFayden (4) , Gianna Moenig (4) , Emanuel Pfeffer (3)

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Andrej Saibel (5) Matthias Schroeder (3) Joshuha Thomas-Wilsker (7) ((1) Deutsches Elektron Synchroton DESY Germany (2) University at Freiburg Germany (3) Karlsruhe Institut of Technology KIT Germany (4) University of Sussex Great Britain (5) Instituto de Física Corpuscular Consejo Superior de Investigaciones Científicas Spain (6) University at Hamburg Germany (7) Institute of High Energy Physics Chinese Academy of Sciences China)

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This note presents Monte Carlo generator comparisons of the ttbb and ttW processes at particle level. The aim is to compare the modelling of important backgrounds to ttH measurements in multi-lepton final states and in the ttH(H->bb) decay channel and the treatment of the associated theory uncertainties for a combination of the full Run-2 ttH results from ATLAS and CMS. As a first step, modelling and theory uncertainties as used in ATLAS an CMS are compared in the relevant analysis regions. Significant differences in the treatment of systematic uncertainties between the experiments have been observed in ttbb and ttW. As a first step, ATLAS and CMS agreed on a common reference value of the inclusive ttW cross section to allow direct comparisons between experiments.

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