NLO QCD corrections to Higgs pair production including dimension-6 operators

Gröber, Ramona; Mühlleitner, Margarete; Spira, M.; Streicher, J.

doi:10.1007/jhep09(2015)092

Cited by 90 publications

(87 citation statements)

References 67 publications

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“…While no evidence for double-Higgs production is observed, a 95% confidence level (CL) upper limit of 0.69 pb is set on the production cross section, which is about 70 times above the SM expectation of (9.9 ± 1.3) fb [10]. To derive a bound onc 6 , we use the MadGraph5 aMC@NLO [48] implementation of cross section computations for loop-induced processes [49] as well as HPAIR [50,51].…”

Section: Constraints From Double-higgs Productionmentioning

confidence: 99%

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

Gorbahn

Haisch

2016

J. High Energ. Phys.

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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 hγγ 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 → 2h. 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.

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Section: Constraints From Double-higgs Productionmentioning

confidence: 99%

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

Gorbahn

Haisch

2016

J. High Energ. Phys.

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“…However, as we will discuss, for the parameters we study (jc ghd j < 40), LHC Higgs production is unaffected at leading order by the addition of a chromomagnetic dipole. Therefore, for the purpose of designing searches for an anomalous b-quark chromomagnetic dipole, we omit percentage-level QCD corrections to Higgs production [53][54][55][56][57][58][59][60][61].…”

Section: Figmentioning

confidence: 99%

Boosted Higgs bosons from chromomagneticb’s:bb¯hat high luminosity

et al. 2016

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This paper examines detection prospects and constraints on the chromomagnetic dipole operator for the bottom quark. This operator has a flavor, chirality and Lorentz structure that is distinct from other dimension-6 operators considered in Higgs coupling studies. Its nonstandard Lorentz structure results in boosted bbh events, providing a rate-independent signal of new physics. To date, we find this operator is unconstrained by pp → h þ jets and pp →bb searches: for order-1 couplings the permitted cutoff Λ for this operator can be as low as Λ ∼ 1 TeV. We show how to improve this bound with collider cuts that allow a b-tagged Higgs-plus-dijet search in the Higgs-to-diphoton decay channel to exclude cutoffs as high as ∼6 TeV at 2σ with 3 ab −1 of luminosity at the 14 TeV LHC. Cuts on the p T of the Higgs are key to this search, because the chromomagnetic dipole yields a nonstandard fraction of boosted Higgses.

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“…Figure 3 can also be obtained by using the results of ref. [103]. Note however, that the effects of heavy top and bottom partners in the effective field theory computation of ref.…”

Section: Jhep06(2016)080mentioning

confidence: 93%

“…They have been provided in the large loop particle mass limit for the singlet-extended SM [71], for the 2-Higgs-doublet model [60] and for the MSSM [10,77]. 4 In the same limit, the NLO QCD corrections including dimension-6 operators have been computed in [103]. In this work, we calculate for the first time the NLO QCD corrections in the large loop particle mass limit for models with vector-like fermions such as composite Higgs models.…”

Section: Jhep06(2016)080mentioning

confidence: 99%

Signs of composite Higgs pair production at next-to-leading order

Gröber

Mühlleitner

Spira

2016

J. High Energ. Phys.

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Abstract:In composite Higgs models the Higgs boson arises as a pseudo-Goldstone boson from a strongly-interacting sector. Fermion mass generation is possible through partial compositeness accompanied by the appearance of new heavy fermionic resonances. The Higgs couplings to the Standard Model (SM) particles and between the Higgs bosons themselves are modified with respect to the SM. Higgs pair production is sensitive to the trilinear Higgs self-coupling but also to anomalous couplings like the novel 2-Higgs-2-fermion coupling emerging in composite Higgs models. The QCD corrections to SM Higgs boson pair production are known to be large. In this paper we compute, in the limit of heavy loop particle masses, the next-to-leading order (NLO) QCD corrections to Higgs pair production in composite Higgs models without and with new heavy fermions. The relative QCD corrections are found to be almost insensitive both to the compositeness of the Higgs boson and to the details of the heavy fermion spectrum, since the leading order cross section dominantly factorizes. With the obtained results we investigate the question if, taking into account Higgs coupling constraints, new physics could first be seen in Higgs pair production. We find this to be the case in the high-luminosity option of the LHC for composite Higgs models with heavy fermions. We also investigate the invariant mass distributions at NLO QCD. While they are sensitive to the Higgs non-linearities and hence anomalous couplings, the influence of the heavy fermions is much less pronounced.

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NLO QCD corrections to Higgs pair production including dimension-6 operators

Cited by 90 publications

References 67 publications

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

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

Boosted Higgs bosons from chromomagneticb’s:bb¯hat high luminosity

Signs of composite Higgs pair production at next-to-leading order

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