Off-shell Higgs production at the LHC as a probe of the trilinear Higgs coupling

Abstract

In the context of the Standard Model effective field theory (SMEFT) we examine the constraints on the trilinear Higgs coupling that originate from off-shell Higgs production in proton-proton collisions. Our calculation of the $gg\to h^{\ast }\to ZZ\to 4\ell$ process includes two-loop corrections to gluon-gluon-fusion Higgs production and one-loop corrections to the Higgs propagator and its decay. Employing a matrix-element based kinematic discriminant we determine the reach of LHC Run 3 and the high-luminosity option of the LHC in constraining the relevant SMEFT Wilson coefficients. We present constraints that are not only competitive with but also complementary to the projected indirect limits that one expects to obtain from inclusive measurements of single-Higgs production processes at future LHC runs.

29 pages, 9 figures, 3 tables; extended version including a new appendix as accepted for publication in JHEP

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Cited by in corpus (5)

• Charting the Higgs self-coupling boundaries
• A new evaluation of the $HZZ$ coupling: direct bounds on anomalous contributions and $CP$ violating effects via a new asymmetry
• Probing Higgs portals with matrix-element based kinematic discriminants in $ZZ\to 4\ell$ production
• Higgs probes of top quark contact interactions and their interplay with the Higgs self-coupling
• Constraining the Higgs potential using multi-Higgs production