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ZhETF, Vol. 147, No. 3, p. 410 (March 2015)
(English translation - JETP, Vol. 120, No. 3, March 2015 available online at )

Azatov A., Grojean C., Paul A., Salvioni E.

Received: July 22, 2014

DOI: 10.7868/S0044451015030039

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We study the off-shell Higgs data in the process pp\to h^{(*)} \to Z^{(\ast)}Z^{(\ast)}\to 4\ell, to constrain deviations of the Higgs couplings. We point out that this channel can be used to resolve the long- and short-distance contributions to Higgs production by gluon fusion and can thus be complementary to pp\to ht\bar t in measuring the top Yukawa coupling. Our analysis, performed in the context of effective field theory, shows that current data do not allow drawing any model-independent conclusions. We study the prospects at future hadron colliders, including the high-luminosity LHC and accelerators with higher energy, up to 100 TeV. The available QCD calculations and the theoretical uncertainties affecting our analysis are also briefly discussed. Contribution for the JETP special issue in honor of V. A. Rubakov's 60th birthday

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