Di-Higgs boson peaks and top valleys: Interference effects in Higgs sector extensions

Basler, P., Dawson, S., Englert, C. and Muhlleitner, M. (2020) Di-Higgs boson peaks and top valleys: Interference effects in Higgs sector extensions. Physical Review D, 101, 015019. (doi: 10.1103/PhysRevD.101.015019)

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In models with extended scalars and CP violation, resonance searches in double Higgs final states stand in competition with related searches in top quark final states as optimal channels for the discovery of beyond the Standard Model (BSM) physics. This complementarity is particularly relevant for benchmark scenarios that aim to highlight multi-Higgs production as a standard candle for the study of BSM phenomena. In this paper, we compare interference effects in t¯t final states with correlated phenomena in double Higgs production in the complex singlet and the complex two-Higgs-doublet models. Our results indicate that the BSM discovery potential in di-Higgs searches can be underestimated in comparison to t¯t resonance searches. Top pair final states are typically suppressed due to destructive signal-background interference, while hh final states can be enhanced due to signal-signal interference. For parameter choices where the two heavy Higgs resonances are well separated in mass, top final states are suppressed relative to the naive signal expectation, while estimates of the production cross section times branching ratio remain accurate at the O(10%) level for double Higgs final states.

Item Type:Articles
Additional Information:P. B. acknowledges financial support by the Graduiertenkolleg GRK 1694: Elementarteilchenphysik bei höchster Energie und höchster Präzision. M. M. acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Grant No. 396021762—TRR 257. S. D. is supported by the U.S. Department of Energy under Grant No. de-sc0012704. C. E. is supported by the UK Science and Technology Facilities Council (STFC) under Grant No. ST/P000746/1. This work was supported by the Munich Institute for Astro- and Particle Physics (MIAPP) of the DFG Excellence Cluster Origins (www.origins-cluster.de).
Glasgow Author(s) Enlighten ID:Englert, Professor Christoph
Authors: Basler, P., Dawson, S., Englert, C., and Muhlleitner, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN (Online):2470-0029
Published Online:28 January 2020
Copyright Holders:Copyright © 2020 American Physical Society
First Published:First published in Physical Review D 101:015019
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173809Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience and Technology Facilities Council (STFC)ST/P000746/1P&S - Physics & Astronomy