Limitations and opportunities of off-shell coupling measurements

Englert, Christoph; Spannowsky, Michael

doi:10.1103/physrevd.90.053003

Limitations and opportunities of off-shell coupling measurements

Englert, Christoph; Spannowsky, Michael

Authors

Christoph Englert

Professor Michael Spannowsky michael.spannowsky@durham.ac.uk
Director

Abstract

Indirect constraints on the total Higgs width Γh from correlating Higgs signal strengths with cross-section measurements in the off-shell region for p(g)p(g)→4ℓ production have received considerable attention recently, and the CMS Collaboration have published a first measurement. We revisit this analysis from a new physics and unitarity constraints perspective and conclude that limits on Γh obtained in this fashion are not reliable unless we make model-specific assumptions, which cannot be justified at the current stage of the LHC program. Relaxing the Γh interpretation, we discuss the merits of high invariant mass cross-section measurements in the context of Higgs CP analyses, higher-dimensional operator testing, and resolved new physics in the light of electroweak precision constraints beyond effective theory limitations. Furthermore, we show that a rather model-independent LHC constraint can be obtained from adapting the gg→4ℓ analysis to the weak boson fusion channels at lower statistical yield.

Citation

Englert, C., & Spannowsky, M. (2014). Limitations and opportunities of off-shell coupling measurements. Physical Review D, 90(5), Article 053003. https://doi.org/10.1103/physrevd.90.053003

Journal Article Type	Article
Acceptance Date	May 12, 2014
Online Publication Date	Sep 3, 2014
Publication Date	Sep 3, 2014
Deposit Date	Dec 12, 2014
Publicly Available Date	Apr 27, 2015
Journal	Physical Review D
Print ISSN	1550-7998
Electronic ISSN	1550-2368
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	90
Issue	5
Article Number	053003
DOI	https://doi.org/10.1103/physrevd.90.053003

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