Electroweak oblique parameters as a probe of the trilinear Higgs boson self-interaction

Kribs, Graham D.; Maier, Andreas; Rzehak, Heidi; Spannowsky, Michael; Waite, Philip

Abstract

We calculate the two-loop contributions from a modified trilinear Higgs self-interaction, κλλSMvh3, to the electroweak oblique parameters S and T. Using the current bounds on S and T from electroweak measurements, we find the 95% C.L. constraint on the modified trilinear coupling to be −14.0≤κλ≤17.4. The largest effects on S and T arise from two insertions of the modified trilinear coupling that result in T/S≃−3/2; remarkably, this is nearly parallel to the axis of the tightest experimental constraint in the S-T plane. No contributions to S and T arise from a modified Higgs quartic coupling at two-loop order. These calculations utilized a gauge-invariant parameterization of the trilinear Higgs coupling in terms of higher dimensional operators (H†H)n with n≥3. Interestingly, the bounds on κλ that we obtain are comparable to constraints from di-Higgs production at the LHC as well as recent bounds from single Higgs production at the LHC.

Citation

Kribs, G. D., Maier, A., Rzehak, H., Spannowsky, M., & Waite, P. (2017). Electroweak oblique parameters as a probe of the trilinear Higgs boson self-interaction. Physical Review D, 95(9), Article 093004. https://doi.org/10.1103/physrevd.95.093004

• Journal Article Type: Article
• Online Publication Date: May 30, 2017
• Publication Date: May 30, 2017
• Deposit Date: Jun 19, 2017
• Publicly Available Date: Jun 30, 2017
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 95
• Issue: 9
• Article Number: 093004
• DOI: https://doi.org/10.1103/physrevd.95.093004
• Public URL: https://durham-repository.worktribe.com/output/1376852