Next-to-leading order corrections for $gg \to ZH$ with top quark mass dependence

Wang, Guoxing; Xu, Xiaofeng; Xu, Yongqi; Yang, Li Lin

doi:10.48550/arxiv.2107.08206

Cited by 4 publications

(8 citation statements)

References 45 publications

(62 reference statements)

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“…It should be remarked that our definition of the NLO contribution to gg → ZH process differs from the one employed in Refs. [28,29]. In those references, diagrams in which a Z boson is emitted from an open fermion line, which we denote as Z-radiated diagrams for brevity (see subsection 2.2), were not taken into account because they were assigned to uncalculated N 3 LO corrections to the Drell-Yan-like contribution.…”

Section: The Gg → Zh Channel At Nlomentioning

confidence: 99%

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On the NLO QCD Corrections to Gluon-Initiated ZH Production

Degrassi,

Gröber,

Vitti

et al. 2022

Preprint

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We compute the QCD corrections at next-to-leading order for the process gg → ZH, including both the virtual two-loop terms and real-emission contributions. The two-loop box diagrams in the virtual corrections are approximated analytically over the complete phase space, combining the results of an expansion in the limit of small transverse momentum and an expansion in the regime of high energy. We obtain both inclusive and differential results for the cross section. We find that the NLO QCD corrections are of the same size as the LO contribution up to ZH invariant masses close to 1 TeV, but they increase significantly when higher energies are considered, due to a class of real-emission diagrams in which the Z boson is radiated from an open quark line. Finally, we estimate the uncertainty due to the renormalization scheme used for the top-quark mass both on the total and differential cross section.

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Section: The Gg → Zh Channel At Nlomentioning

confidence: 99%

“…An approximation that retains the effects of the top-quark mass and that is accurate over the complete phase space has been presented in Ref. [28], whereas the very recent calculation of Ref. [29] relies on a combination of the Padé-improved high-energy expansion presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

On the NLO QCD Corrections to Gluon-Initiated ZH Production

Degrassi,

Gröber,

Vitti

et al. 2022

Preprint

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“…Other NNLO QCD calculations including an interface to a parton shower event generator have been presented in [20,21] and [22], where the latter includes decay corrections. The phenomenological impact of heavy quark loop contributions has been studied in [23][24][25][26][27]. For the V H + jet production mode, fixed-order NLO QCD computations for V H and V H + jet production have been merged in the context of parton showers to provide full NLO+PS simulations for these (on-shell) Higgs production modes [22,28].…”

Section: Introductionmentioning

confidence: 99%

VH + jet production in hadron-hadron collisions up to order $$ {\alpha}_{\mathrm{s}}^3 $$ in perturbative QCD

Gauld

Ridder

Glover

et al. 2022

J. High Energ. Phys.

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We present precise predictions for the hadronic production of an on-shell Higgs boson in association with a leptonically decaying gauge boson and a jet up to order $$ {\alpha}_{\mathrm{s}}^3 $$ α s 3 . We include the complete set of NNLO QCD corrections to both charged- and neutral-current Drell-Yan type contributions, as well as the previously known leading heavy quark loop induced contributions which involve a direct Higgs-quark coupling. As an application, we study a range of differential observables in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV for both the charged- and neutral-current production modes. For each Higgs production process, we assess the improvement in the theoretical uncertainty for both the exclusive (njet = 1) and inclusive (njet ≥ 1) jet categories. We find that the inclusion of the NNLO corrections to the Drell-Yan type contributions is essential in stabilising the predictions and in reducing the theoretical uncertainty for both inclusive and exclusive jet production for all three modes. This is particularly true in the kinematical regimes associated with low to medium values of the transverse momentum of the produced vector boson and where the differential cross sections are the largest. For the neutral-current process, we find that the heavy quark loop induced contributions have their largest phenomenological impact (an increase in the size of the NNLO corrections, a distortion of the distribution shape and an enlargement of the left over remaining uncertainties) in kinematical regions associated to large values of pT,Z (typically above 150 GeV) where the cross sections are smaller.

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“…iv) The evaluation via an expansion in terms of small external masses [23][24][25]. Here ŝ, t, m t are assumed to be the large energy scale while m H and m Z are considered to be the small ones.…”

Section: Introductionmentioning

confidence: 99%

Gluon Fusion Production at NLO: Merging the Transverse Momentum and the High-Energy Expansions

Bellafronte,

Degrassi,

Giardino

et al. 2022

Preprint

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The virtual corrections to gg → HH and gg → ZH are analytically evaluated combining an expansion in the small transverse momentum of the final particles with an expansion valid at high energies. The two expansion methods describe complementary regions of the phase space and we merge their results, extending the range of validity of both expansions using Padé approximants. We show that this approach can reproduce the available numerical results retaining the exact top quark mass dependence with an accuracy well below the 1% level. Our results allow a fast and flexible evaluation of the virtual corrections of the considered processes. Furthermore, they are available in different renormalisation schemes of the top quark mass.

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Next-to-leading order corrections for $gg \to ZH$ with top quark mass dependence

Cited by 4 publications

References 45 publications

On the NLO QCD Corrections to Gluon-Initiated ZH Production

On the NLO QCD Corrections to Gluon-Initiated ZH Production

VH + jet production in hadron-hadron collisions up to order $$ {\alpha}_{\mathrm{s}}^3 $$ in perturbative QCD

Gluon Fusion Production at NLO: Merging the Transverse Momentum and the High-Energy Expansions

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