t $ \bar{\mathrm{t}} $ W± + t $ \bar{\mathrm{t}} $ Z hadroproduction at NLO accuracy in QCD with Parton Shower and Hadronization effects

Garzelli, Maria Vittoria; Kardos, Ádám; Papadopoulos, Costas G.; Trocsanyi, Z. L.

doi:10.1007/jhep11(2012)056

Cited by 181 publications

(201 citation statements)

References 30 publications

Supporting

Mentioning

192

Contrasting

Order By: Relevance

“…Processes that explicitly involve b-quarks in the final state, and process e.13, are calculated in the four-flavour scheme, while all of the others are in the five-flavour scheme. Results are available in the literature for W bb [68,[309][310][311][312], Zbb [68,311,313], ttγ [314], ttZ [68,315,316,363,364], ttW [68,316,317] production. For the majority of the processes in this table, NLO corrections are calculated in this work for the first time.…”

Section: Jhep07(2014)079mentioning

confidence: 99%

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

Alwall

Frederix

Frixione

et al. 2014

J. High Energ. Phys.

6,069

5,572

View full text Add to dashboard Cite

We discuss the theoretical bases that underpin the automation of the computations of tree-level and next-to-leading order cross sections, of their matching to parton shower simulations, and of the merging of matched samples that differ by light-parton multiplicities. We present a computer program, MadGraph5 aMC@NLO, capable of handling all these computations -parton-level fixed order, shower-matched, merged -in a unified framework whose defining features are flexibility, high level of parallelisation, and human intervention limited to input physics quantities. We demonstrate the potential of the program by presenting selected phenomenological applications relevant to the LHC and to a 1-TeV e + e − collider. While next-to-leading order results are restricted to QCD corrections to SM processes in the first public version, we show that from the user viewpoint no changes have to be expected in the case of corrections due to any given renormalisable Lagrangian, and that the implementation of these are well under way.

show abstract

Section: Jhep07(2014)079mentioning

confidence: 99%

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

Alwall

Frederix

Frixione

et al. 2014

J. High Energ. Phys.

6,069

5,572

View full text Add to dashboard Cite

show abstract

“…The total predictions of these MC samples are rescaled to match NLO predictions from Refs. [53,54] and Ref. [55], respectively.…”

Section: B Background Samplesmentioning

confidence: 99%

Measurements ofW±Zproduction cross sections inppcollisions ats=8<

Aad¹,

Abbott²,

Abdallah³

et al. 2016

Phys. Rev. D

View full text Add to dashboard Cite

This paper presents measurements of W AE Z production in pp collisions at a center-of-mass energy of 8 TeV. The gauge bosons are reconstructed using their leptonic decay modes into electrons and muons. The data were collected in 2012 by the ATLAS experiment at the Large Hadron Collider and correspond to an integrated luminosity of 20.3 fb −1 . The measured inclusive cross section in the detector fiducial region is σ W AE Z→l 0 νll ¼ 35.1 AE 0.9ðstatÞ AE 0.8ðsysÞ AE 0.8ðlumiÞ fb, for one leptonic decay channel. In comparison, the next-to-leading-order Standard Model expectation is 30.0 AE 2.1 fb. Cross sections for W þ Z and W − Z production and their ratio are presented as well as differential cross sections for several kinematic observables. Limits on anomalous triple gauge boson couplings are derived from the transverse mass spectrum of the W AE Z system. From the analysis of events with a W and a Z boson associated with two or more forward jets an upper limit at 95% confidence level on the W AE Z scattering cross section of 0.63 fb, for each leptonic decay channel, is established, while the Standard Model prediction at next-to-leading order is 0.13 AE 0.01 fb. Limits on anomalous quartic gauge boson couplings are also extracted.

show abstract

“…Finally, uncertainties of 30% and of 50% are assigned to the cross sections of tt + W and of tt + Z production, respectively [55,74].…”

Section: Jhep10(2013)189mentioning

confidence: 99%

Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in $ \sqrt{s}=8 $ TeV pp collisions with the ATLAS detector

Aad¹,

Abajyan²,

Abbott³

et al. 2013

J. High Energ. Phys.

134

129

View full text Add to dashboard Cite

Abstract:The results of a search for pair production of supersymmetric partners of the Standard Model third-generation quarks are reported. This search uses 20.1 fb −1 of pp collisions at √ s = 8 TeV collected by the ATLAS experiment at the Large Hadron Collider. The lightest bottom and top squarks (b 1 andt 1 respectively) are searched for in a final state with large missing transverse momentum and two jets identified as originating from b-quarks. No excess of events above the expected level of Standard Model background is found. The results are used to set upper limits on the visible cross section for processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of the third-generation squarks are derived in phenomenological supersymmetric R-parityconserving models in which either the bottom or the top squark is the lightest squark. Thẽ b 1 is assumed to decay viab 1 → bχ 0 1 and thet 1 viat 1 → bχ ± 1 , with undetectable products of the subsequent decay of theχ ± 1 due to the small mass splitting between theχ ± 1 and theχ 0 1 . Keywords: Hadron-Hadron Scattering, SupersymmetryOpen Access, Copyright CERN, for the benefit of the ATLAS collaboration The ATLAS collaboration 24 IntroductionSupersymmetry (SUSY) [1][2][3][4][5][6][7][8][9] provides an extension of the Standard Model (SM) that solves the hierarchy problem [10][11][12][13] by introducing supersymmetric partners of the known bosons and fermions. In the framework of the R-parity-conserving minimal supersymmetric extension of the SM (MSSM) [14][15][16][17][18], SUSY particles are produced in pairs and the lightest supersymmetric particle (LSP) is stable, providing a possible candidate for dark matter. In a large variety of models, the LSP is the lightest neutralino (χ 0 1 ). The coloured superpartners of quarks and gluons, the squarks (q) and the gluinos (g), if not too heavy, would be produced in strong interaction processes at the Large Hadron Collider (LHC) [19] and decay via cascades ending with the LSP. The undetected LSP would result in missing transverse momentum while the rest of the cascade would yield final states with multiple jets and possibly leptons.A study of the expected SUSY particle spectrum derived from naturalness considerations [20, 21] suggests that the supersymmetric partners of the third-generation SM quarks are the lightest coloured supersymmetric particles. This may lead to the lightest bottom squark (sbottom,b 1 ) and top squark (stop,t 1 ) mass eigenstates being significantly lighter than the other squarks and the gluinos. As a consequence,b 1 andt 1 could be pair-produced with relatively large cross sections at the LHC.-1 - JHEP10(2013)189Two possible sets of SUSY mass spectra are considered in this paper. In the first set of scenarios, the lightest sbottom is the only coloured sparticle contributing to the production processes and it only decays viab 1 → bχ 0 1 . In the second set, the lightest stop is the only coloured sparticle allowed in the production processes and it decays exclusively...

show abstract

t $ \bar{\mathrm{t}} $ W± + t $ \bar{\mathrm{t}} $ Z hadroproduction at NLO accuracy in QCD with Parton Shower and Hadronization effects

Cited by 181 publications

References 30 publications

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

Measurements ofW±Zproduction cross sections inppcollisions ats=8<

Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in $ \sqrt{s}=8 $ TeV pp collisions with the ATLAS detector

Contact Info

Product

Resources

About