Irreducible background and interference effects for Higgs-boson production in association with a top-quark pair

Denner, Ansgar; Feger, Robert; Scharf, Andreas

doi:10.1007/jhep04(2015)008

Cited by 25 publications

(31 citation statements)

References 57 publications

(55 reference statements)

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“…(5.39), we call the (infinite) set of complex numbers: We further observe that, given eqs. (5.33)-(5.38), T has a zero winding number 19 around the origin. This implies that the final, analytically-continued form of B 0 will feature either first-or second-(both positive and negative) Riemann sheet logarithms.…”

Section: Definition Of Mass and Wavefunction Uv Counterterms In The Cmentioning

confidence: 99%

The automation of next-to-leading order electroweak calculations

Frederix

Frixione

Hirschi

et al. 2018

J. High Energ. Phys.

250

327

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We present the key features relevant to the automated computation of all the leading-and next-to-leading order contributions to short-distance cross sections in a mixed-coupling expansion, with special emphasis on the first subleading NLO term in the QCD+EW scenario, commonly referred to as NLO EW corrections. We discuss, in particular, the FKS subtraction in the context of a mixed-coupling expansion; the extension of the FKS subtraction to processes that include final-state tagged particles, defined by means of fragmentation functions; and some properties of the complex mass scheme. We combine the present paper with the release of a new version of MadGraph5 aMC@NLO, capable of dealing with mixed-coupling expansions. We use the code to obtain illustrative inclusive and differential results for the 13-TeV LHC.

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Section: Definition Of Mass and Wavefunction Uv Counterterms In The Cmentioning

confidence: 99%

The automation of next-to-leading order electroweak calculations

Frederix

Frixione

Hirschi

et al. 2018

J. High Energ. Phys.

250

327

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“…Additionally, top quarks and W , and Z bosons are treated as unstable intermediate particles. Offshell effects for the top quark are small for inclusive observables and of the order of Γ t /m t ≈ 1%, as has been found in various calculations [6,[8][9][10][11][30][31][32]. However, for certain observables off-shell effects can have a larger impact and can affect searches for the Higgs boson [33] .…”

Section: Pos(lhcp2016)159mentioning

confidence: 90%

Top quark pair production in association with a jet with NLO QCD off-shell effects

Kraus¹

2016

Proceedings of Fourth Annual Large Hadron Collider Physics — PoS(LHCP2016)

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A short summary of a NLO QCD calculation for the top-quark pair production with a jet in the dilepton decay channel is presented. The calculation takes into account all double, single, non-resonant and interference contributions. Thus, NLO QCD corrections are computed for the process pp → e + ν e µ −ν µ bb j + X. This calculation provides the first complete description, which overcomes the narrow width approximation for tt j process in the dilepton decay channel. Results for the total cross section and differential distributions for the LHC at √ s = 8 TeV are shown.

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“…of Eq. (3.18) we defined two new functions, one of them 19) in which the summation over i and b is explicit. The definition of if is analogous.…”

Section: W-pair Production In Lepton/hadron/photon Collisionsmentioning

confidence: 99%

“…[18] the concept of a PA was carried to the next-tonext-to-leading-order level and applied to the mixed QCDelectroweak corrections of O(α s α). Applications of the PA to processes with more than two resonances only exist for leading-order (LO) predictions (see, e.g., [19]). …”

Section: Introductionmentioning

confidence: 99%

Non-factorizable photonic corrections to resonant production and decay of many unstable particles

Dittmaier¹,

Schwan²

2016

Eur. Phys. J. C

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Electroweak radiative corrections to the production of high-multiplicity final states with several intermediate resonances in most cases can be sufficiently well described by the leading contribution of an expansion about the resonance poles. In this approach, also known as pole approximation, corrections are classified into separately gauge-invariant factorizable and non-factorizable corrections, where the former can be attributed to the production and decay of the unstable particles on their mass shell. The remaining non-factorizable corrections are induced by the exchange of soft photons between different production and decay subprocesses. We give explicit analytical results for the non-factorizable photonic virtual corrections to the production of an arbitrary number of unstable particles at the one-loop level and, thus, present an essential building block in the calculation of nextto-leading-order electroweak corrections in pole approximation. The remaining virtual factorizable corrections can be obtained with modern automated one-loop matrix-element generators, while the evaluation of the corresponding real photonic corrections can be evaluated with full matrix elements by multi-purpose Monte Carlo generators. Our results can be easily modified to non-factorizable QCD corrections, which are induced by soft-gluon exchange.

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Irreducible background and interference effects for Higgs-boson production in association with a top-quark pair

Cited by 25 publications

References 57 publications

The automation of next-to-leading order electroweak calculations

The automation of next-to-leading order electroweak calculations

Top quark pair production in association with a jet with NLO QCD off-shell effects

Non-factorizable photonic corrections to resonant production and decay of many unstable particles

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