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Limitations and opportunities of off-shell coupling measurements

Englert, Christoph; Spannowsky, Michael

Limitations and opportunities of off-shell coupling measurements Thumbnail


Christoph Englert


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.


Englert, C., & Spannowsky, M. (2014). Limitations and opportunities of off-shell coupling measurements. Physical Review D, 90(5), Article 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


Published Journal Article (611 Kb)

Copyright Statement
Reprinted with permission from the American Physical Society: Physical Review D 90, 053003 © 2014 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.

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