Indirect probes of the trilinear Higgs coupling: gg → h and h → γγ

A bstract In the framework of the Standard Model effective field theory, we examine the indirect constraints on the trilinear Higgs coupling λ that arise from Higgs production in gluon-gluon-fusion and diphoton Higgs decays. We calculate 2-loop contributions to the gg → h and h → γγ amplitudes that...

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Bibliographic Details
Published in:The journal of high energy physics 2016-10, Vol.2016 (10), Article 94
Main Authors: Gorbahn, Martin, Haisch, Ulrich
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Elementary Particles
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
String Theory
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Summary:A bstract In the framework of the Standard Model effective field theory, we examine the indirect constraints on the trilinear Higgs coupling λ that arise from Higgs production in gluon-gluon-fusion and diphoton Higgs decays. We calculate 2-loop contributions to the gg → h and h → γγ amplitudes that are affected by modifications of the trilinear Higgs-boson vertex. Based on our new results, we analyse the sensitivity of present and future measurements of the hgg and h γγ couplings to shifts in λ. Under the assumption that O 6 = −λ ( H † H ) 3 is the only dimension-6 operator that alters the trilinear Higgs interactions, we find that at present the considered loop-level probes provide stronger constraints than pp → 2 h . At future high-energy colliders indirect O 5 determinations of the trilinear Higgs coupling may be possible, making precision measurements of gg → h and h → γγ a useful addition to direct extractions of λ through double-Higgs production.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP10(2016)094