GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and beyond

Cullen, G.; Deurzen, H. van; Greiner, Nicolas; Heinrich, G.; Luisoni, Gionata; Mastrolia, Pierpaolo; Mirabella, Edoardo; Ossola, Giovanni; Peraro, Tiziano; Schlenk, J.; Soden-Fraunhofen, J. F. von; Tramontano, Francesco

doi:10.1140/epjc/s10052-014-3001-5

Cited by 252 publications

(258 citation statements)

References 146 publications

(274 reference statements)

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“…The main technical challenge to obtaining results at NNLL accuracy is thus the calculation of the hard function to NLO, which unlike the soft function and soft anomalous dimension is process dependent. We carry out this calculation for the first time here, using a modified version of the one-loop providers GoSam [26,27], Openloops [28] and MadLoop [29]. Our result thus adds to the growing literature on hard functions for 2 → 3 processes, i.e.…”

Section: Jhep03(2016)124mentioning

confidence: 72%

“…Most of these tools are publicly available and many rely on reduction techniques operating at the integrand level, such as the Ossola-Papadopoulos-Pittau method [35]. For this reason we decided to carry out the calculation of the NLO hard function with three of these tools: GoSam [26,27], MadLoop [29] and Openloops [28]. All of these tools required a certain level of customization in order to make the calculation of the hard function possible.…”

Section: Jhep03(2016)124mentioning

confidence: 99%

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Associated production of a top pair and a Higgs boson beyond NLO

Broggio

Ferroglia

Pecjak³

et al. 2016

J. High Energ. Phys.

119

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We consider soft gluon emission corrections to the production of a top-antitop pair in association with a Higgs boson at hadron colliders. In particular, we present a softgluon resummation formula for this production process and gather all elements needed to evaluate it at next-to-next-to-leading logarithmic order. We employ these results to obtain approximate next-to-next-to-leading order (NNLO) formulas, and implement them in a bespoke parton-level Monte Carlo program which can be used to calculate the total cross section along with arbitrary differential distributions. We use this tool to study the phenomenological impact of the approximate NNLO corrections, finding that they increase the total cross section and the differential distributions which we evaluated in this work.

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Section: Jhep03(2016)124mentioning

confidence: 72%

Section: Jhep03(2016)124mentioning

confidence: 99%

Associated production of a top pair and a Higgs boson beyond NLO

Broggio

Ferroglia

Pecjak³

et al. 2016

J. High Energ. Phys.

119

View full text Add to dashboard Cite

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“…We use MadLoop/aMC@NLO [33] and GoSam [34] to generate the matrix elements of triple-Higgs production via gluon fusion. Then we use the VBFNLO code [35][36][37] to perform the phase space integration, where we set the parton distribution functions (PDFs) as CTEQ6L1 [38].…”

Section: The MC Simulationmentioning

confidence: 99%

Probing triple-Higgs productions via4b2γdecay channel at a 100 TeV hadron collider

et al. 2016

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The quartic self-coupling of the Standard Model Higgs boson can only be measured by observing the triple-Higgs production process, but it is challenging for the LHC Run 2 or ILC at a few TeV because of its extremely small production rate. In this paper, we present a detailed MC simulation study of the triple-Higgs production through gluon fusion at a 100 TeV hadron collider and explore the feasibility of observing this production mode. We focus on the decay channel HHH → bbbbγγ, investigating detector effects and optimizing the kinematic cuts to discriminate the signal from the backgrounds. Our study shows that in order to observe the Standard Model triple-Higgs signal, the integrated luminosity of a 100 TeV hadron collider should be greater than 1.8 × 10 4 ab −1 . We also explore the dependence of the cross section upon the trilinear (λ 3 ) and quartic (λ 4 ) self-couplings of the Higgs. We find that, through a search in the triple Higgs production, the parameters λ 3 and λ 4 can be restricted to the ranges [−1, 5] and [−20, 30], respectively. We also examine how new physics can change the production rate of triple-Higgs events. For example, in the singlet extension of the Standard Model, we find that the triple-Higgs production rate can be increased by a factor of O(10).

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“…Today, 2 → 4 processes at next-to-leading order (NLO) are state of the art [1][2][3][4][5], and even higher multiplicities are affordable [6]. Several tools for the automated calculation of NLO differential cross sections are available [7,8], including the merging with parton showers [9]. There has been also a lot of advances in next-to-next-to-leading order (NNLO) calculations [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

On the singular behaviour of scattering amplitudes in quantum field theory

Buchta

Chachamis

Draggiotis

et al. 2014

J. High Energ. Phys.

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Abstract:We analyse the singular behaviour of one-loop integrals and scattering amplitudes in the framework of the loop-tree duality approach. We show that there is a partial cancellation of singularities at the loop integrand level among the different components of the corresponding dual representation that can be interpreted in terms of causality. The remaining threshold and infrared singularities are restricted to a finite region of the loop momentum space, which is of the size of the external momenta and can be mapped to the phase-space of real corrections to cancel the soft and collinear divergences.

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GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and beyond

Cited by 252 publications

References 146 publications

Associated production of a top pair and a Higgs boson beyond NLO

Associated production of a top pair and a Higgs boson beyond NLO

Probing triple-Higgs productions via4b2γdecay channel at a 100 TeV hadron collider

On the singular behaviour of scattering amplitudes in quantum field theory

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