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Limitations and opportunities of off-shell coupling measurements.

Englert, Christoph and Spannowsky, Michael (2014) 'Limitations and opportunities of off-shell coupling measurements.', Physical review D., 90 (5). 053003.


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.

Item Type:Article
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Publisher 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.
Date accepted:12 May 2014
Date deposited:27 April 2015
Date of first online publication:03 September 2014
Date first made open access:No date available

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