Resolving gluon fusion loops at current and future hadron colliders

Azatov, Aleksandr; Grojean, Christophe; Salvioni, Ennio; paul, ayan

doi:10.1007/JHEP09(2016)123

Report/Journal Article

PUBDB-2016-04954

Resolving gluon fusion loops at current and future hadron colliders

Azatov, A. (Corresponding author) ; Grojean, C. (Corresponding author)DESY* ; paul, a. (Corresponding author) ; Salvioni, E. (Corresponding author)

2016
Springer Berlin

Journal of high energy physics 09, 123 (2016) [10.1007/JHEP09(2016)123]

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Please use a persistent id in citations: doi:10.1007/JHEP09(2016)123 doi:10.3204/PUBDB-2016-04954

Report No.: arXiv:1608.00977

Abstract: Inclusive Higgs measurements at the LHC have limited resolution on the gluon fusion loops, being unable to distinguish the long-distance contributions mediated by the top quark from possible short-distance new physics effects. Using an Effective Field Theory (EFT) approach we compare several proposed methods to lift this degeneracy, including t tbar h and boosted, off-shell and double Higgs production, and perform detailed projections to the High-Luminosity LHC and a future hadron collider. In addition, we revisit off-shell Higgs production. Firstly, we point out its sensitivity to modifications of the top-Z couplings, and by means of a general analysis we show that the reach is comparable to that of tree-level processes such as t tbar Z production. Implications for composite Higgs models are also discussed. Secondly, we assess the regime of validity of the EFT, performing an explicit comparison for a simple extension of the Standard Model containing one vector-like quark.

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