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On-shell interference effects in Higgs boson final states.

Englert, Christoph and Low, Ian and Spannowsky, Michael (2015) 'On-shell interference effects in Higgs boson final states.', Physical review D., 91 (7). 074029.


Top quark loops in Higgs production via gluon fusion at large invariant final state masses can induce important interference effects in searches for additional Higgs bosons as predicted in, e.g., Higgs portal scenarios and the minimal supersymmetric Standard Model when the heavy scalar is broad or the final state resolution is poor. Currently, the limit setting as performed by both ATLAS and CMS is based on injecting a heavy Higgs-like signal neglecting interference effects. In this paper, we perform a study of such “on-shell” interference effects in p p → Z Z and find that they lead to a ≲ O ( 30 % ) width scheme-dependent modification of the signal strength. Including the continuum contributions to obtain, e.g., the full p p → Z Z → 4 ℓ final state, this modification is reduced to the 10% level in the considered intermediate mass range.

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Publisher statement:Reprinted with permission from the American Physical Society: Englert, Christoph, Low, Ian & Spannowsky, Michael (2015). On-shell interference effects in Higgs boson final states. Physical Review D 91(7): 074029. © 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:No date available
Date deposited:31 May 2018
Date of first online publication:29 April 2015
Date first made open access:No date available

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