NLO matching for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">t</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi mathvariant="normal">t</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover><mml:mi mathvariant="normal">b</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi mathvariant="normal">b</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:math> produc

Cascioli, F.; Maierhöfer, Philipp; Moretti, N.; Pozzorini, Stefano; Siegert, F.

doi:10.1016/j.physletb.2014.05.040

Cited by 67 publications

(40 citation statements)

References 14 publications

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“…A 30 % normalisation uncertainty is assigned to each of the tt+HF background compo- nents (tt + b, tt + bb, tt + B, tt + c, tt + cc, tt + C), and taken to be uncorrelated among them. These uncertainties are expected to be conservative given the recent progress in NLO predictions for tt production with up to two jets merged with a parton shower [76], as well as NLO predictions for tt +≥1b production in the 4F scheme matched to a parton shower [77]. Cross section uncertainties for tt W , tt Z and tth SM backgrounds are taken to be 30 % for each process.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

Probing a light CP-odd scalar in di-top-associated production at the LHC

et al. 2015

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CP-odd scalars are an integral part of many extensions of the Standard Model. Recently, electroweak-scale pseudoscalars have received increased attention in explaining the diffuse gamma-ray excess from the Galactic Centre. Elusive due to absence of direct couplings to gauge bosons, these particles receive only weak constraints from direct searches at LEP or searches performed during the first LHC runs. We investigate the LHC's sensitivity in probing a CP-odd scalar in the mass range 20 ≤ m A ≤ 100 GeV via di-top-associated production using jet-substructure-based reconstruction techniques. We parameterise the scalar's interactions using a simplified model approach and relate the obtained upper limits to couplings within type-I and type-II 2HDMs as well as the NMSSM. We find that in di-top-associated production, experiments at the LHC can set tight limits on CP-odd scalars that fit the Galactic Centre excess. However, direct sensitivity to light CP-odd scalars from the NMSSM remains challenging.

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Section: Systematic Uncertaintiesmentioning

confidence: 99%

Probing a light CP-odd scalar in di-top-associated production at the LHC

et al. 2015

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“…Predictions for top-quark pair production in association with up to two jets are available at the next-to-leading order (NLO) [3][4][5][6][7][8], and NLO calculations for inclusive top-quark pair production and in association with up to one or two jets were matched to parton showers in order to provide predictions at the particle level [9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Next-to-leading order QCD predictions for top-quark pair production with up to three jets

et al. 2017

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We present theoretical predictions for the production of top-quark pairs with up to three jets at the next-to leading order in perturbative QCD. The relevant calculations are performed with Sherpa and OpenLoops. To address the issue of scale choices and related uncertainties in the presence of multiple scales, we compare results obtained with the standard scale H T /2 at fixed order and the MiNLO procedure. Analyzing various cross sections and distributions for tt + 0, 1, 2, 3 jets at the 13 TeV LHC we find a remarkable overall agreement between fixed-order and MiNLO results. The differences are typically below the respective factor-two scale variations, suggesting that for all considered jet multiplicities missing higher-order effects should not exceed the ten percent level.

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“…In the actual analysis the LO þ PS ttbb simulation is improved by a constant K-factor of 1.65. As can be seen from Table I, this reduces the discrepancy between LO þ PS and S-MC@NLO predictions to about 10% or less in the three considered subsamples, while the intrinsic scale uncertainty of the S-MC@NLO prediction is around 20%-30% [57]. We have checked that such good agreement between rescaled LO þ PS and S-MC@NLO predictions holds also for a number of distributions.…”

Section: Signal and Background Cross Sections And Event Generationmentioning

confidence: 57%

“…As a precise benchmark for the irreducible ttbb background we have performed an S-MC@NLO simulation of ttbb production in the 4F scheme [57]. The finite b-quark mass in the 4F scheme avoids collinear g → bb singularities and permits us to cover the full b-quark phase space.…”

Section: Signal and Background Cross Sections And Event Generationmentioning

confidence: 99%

“…Thus it provides a NLO accurate description of tt þ b-jet final states with b-jet multiplicity N b ≥ 1 and N b ≥ 2. As in [57], for the factorization and resummation scale we use μ F ¼ μ Q ¼ ðE T;t þ E T;t Þ=2, and the renormalization scale is related to the top-and bottom-quark transverse energies by μ 4 R ¼ Π i¼t;t;b;b E T;i , where all transverse energies are defined at parton level.…”

Section: Signal and Background Cross Sections And Event Generationmentioning

confidence: 99%

See 1 more Smart Citation

Measuring the signal strength intt¯HwithH→bb
Moretti
¹
,
Petrov
²
,
Pozzorini
³

et al. 2016
Phys. Rev. D
13
0
13
0
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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. A precise measurement of the Higgs boson couplings to bottom and top quarks is of paramount importance during the upcoming LHC runs. We present a comprehensive analysis for the Higgs production process in association with a semileptonically decaying top-quark pair and subsequent Higgs boson decay into bottom quarks. Due to the highly complex final state and large Standard Model backgrounds, measuring the signal strength in this process is known to be challenging. To maximize the sensitivity, we analyze different, statistically independent, phase space regions, where one or more of the heavy resonances are boosted. This allows us to employ jet substructure techniques, which help to reduce large tt þ X backgrounds. We find that combining several ttHðbbÞ phase space regions will allow one to measure deviations of the Standard Model signal strength of order 20% with 3 ab −1 .

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NLO matching for tt¯bb¯ produc

Cited by 67 publications

References 14 publications

Probing a light CP-odd scalar in di-top-associated production at the LHC

Probing a light CP-odd scalar in di-top-associated production at the LHC

Next-to-leading order QCD predictions for top-quark pair production with up to three jets

Measuring the signal strength intt¯HwithH→bb
Moretti
¹
,
Petrov
²
,
Pozzorini
³

et al. 2016
Phys. Rev. D
13
0
13
0
View full text Add to dashboard Cite

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NLO matching for tt¯bb¯ produc

Cited by 67 publications

References 14 publications

Probing a light CP-odd scalar in di-top-associated production at the LHC

Probing a light CP-odd scalar in di-top-associated production at the LHC

Next-to-leading order QCD predictions for top-quark pair production with up to three jets

Measuring the signal strength intt¯HwithH→bbMoretti1, Petrov2, Pozzorini3 et al. 2016Phys. Rev. D130130View full textAdd to dashboardCite

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About

Measuring the signal strength intt¯HwithH→bb
Moretti
¹
,
Petrov
²
,
Pozzorini
³

et al. 2016
Phys. Rev. D
13
0
13
0
View full text Add to dashboard Cite