On interference effects in top-philic decay chains

Atkinson, O., Englert, C. and Stylianou, P. (2021) On interference effects in top-philic decay chains. Physics Letters B, 821, 136618. (doi: 10.1016/j.physletb.2021.136618)

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Sizeable exotic Higgs boson production through gluon fusion via top quark loops is correlated with large Higgs decay probabilities into top quark final states, if these are kinematically accessible. It is known that gg→S→tt¯ is particularly susceptible to signal-background interference effects that can significantly impact discovery sensitivities. In such an instance, identifying more robust signatures to enhance the discovery sensitivity becomes necessary, shifting phenomenological focus to final states that show a reduced destructive signal-background interference. In this work, we discuss the phenomenological relevance of signal-signal and signal-background interference effects for decay chains. In particular, we identify asymmetric cascade decays in models of scalar extensions of the SM Higgs sector as new promising candidates. In parallel, characteristic interference patterns can provide a formidable tool for indirect CP spectroscopy of BSM sectors if a discovery is made in the future. This motivates associated searches at present and future colliders as robust discovery modes of new physics, in addition to serving as a sensitive tool for the reconstruction of the underlying UV electroweak potential.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Englert, Professor Christoph and Stylianou, Mr Panagiotis and Atkinson, Mr Oliver
Authors: Atkinson, O., Englert, C., and Stylianou, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters B
Publisher:Elsevier BV
ISSN (Online):1873-2445
Published Online:02 September 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Physics Letters B 821: 136618
Publisher Policy:Reproduced under a Creative Commons licence
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
313214STFC Glasgow Physics 2020 DTPDavid IrelandScience and Technology Facilities Council (STFC)ST/V506692/1P&S - Physics & Astronomy
306883Research in Particle Physics Theory - Phenomenology from lattice QCD and collider physicsChristine DaviesScience and Technology Facilities Council (STFC)ST/T000945/1P&S - Physics & Astronomy
308821STFC Glasgow 2019 DTPMartin HendryScience and Technology Facilities Council (STFC)ST/T506102/1P&S - Physics & Astronomy