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

Kribs, Graham D. and Maier, Andreas and Rzehak, Heidi and Spannowsky, Michael and Waite, Philip (2017) 'Electroweak oblique parameters as a probe of the trilinear Higgs boson self-interaction.', Physical review D., 95 (9). 093004.


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.

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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review D 95, 093004 © (2017) 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:No date available
Date deposited:30 June 2017
Date of first online publication:30 May 2017
Date first made open access:30 June 2017

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