Event generation with SHERPA 1.1

Gleisberg, T.; Höche, Stefan; Krauss, Frank; Schönherr, Marek; Schumann, Steffen; Siegert, F.; Winter, Jan

doi:10.1088/1126-6708/2009/02/007

Cited by 1,946 publications

(1,889 citation statements)

References 185 publications

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“…Further details of our calculation and implementation and checks can be found in [18]. Furthermore, we have cross-checked the LO and real emission contributions without subtraction term against Sherpa [22,23] and agreement at the per mille level was found for integrated cross sections.…”

Section: Calculational Setupmentioning

confidence: 89%

$$Z\gamma $$ Z γ production in association with two jets at next-to-leading order QCD

Campanario

Kerner²,

Ninh³

et al. 2014

Eur. Phys. J. C

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Next-to-leading order QCD corrections to the QCD-induced pp → l + l − γ j j + X and pp →ν l ν l γ j j + X processes are presented. The latter is used to find an optimal cut to reduce the contribution of radiative photon emission off the charged leptons in the first channel. As expected, the scale uncertainties are significantly reduced at NLO and the QCD corrections are phase-space dependent and important for precise measurements at the LHC.

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Section: Calculational Setupmentioning

confidence: 89%

$$Z\gamma $$ Z γ production in association with two jets at next-to-leading order QCD

Campanario

Kerner²,

Ninh³

et al. 2014

Eur. Phys. J. C

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“…The PYTHIA 6.426 [13] and MC@NLO 4.02 [14] Monte Carlo (MC) generators were used to model the DY signal. In addition, SHERPA 1.3.1 [15] was used to produce signal samples with up to three additional partons, and the final result of the analysis is compared to the generator-level predictions from all three programs. MC@NLO was also used to simulate the tt background, while HERWIG 6.520 [16] …”

Section: Simulated Samplesmentioning

confidence: 99%

Measurement of the high-mass Drell–Yan differential cross-section in pp collisions at s=7 TeV with the ATLAS detector

Aad¹,

Abajyan²,

Abbott³

et al. 2013

Physics Letters B

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This Letter reports a measurement of the high-mass Drell-Yan differential cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. Based on an integrated luminosity of 4.9 fb −1 , the differential cross-section in the Z /γ * → e + e − channel is measured with the ATLAS detector as a function of the invariant mass, m ee , in the range 116 < m ee < 1500 GeV, for a fiducial region in which both the electron and the positron have transverse momentum p T > 25 GeV and pseudorapidity |η| < 2.5.A comparison is made to various event generators and to the predictions of perturbative QCD calculations at next-to-next-to-leading order.© 2013 CERN. Published by Elsevier B.V. All rights reserved. IntroductionAt hadron colliders, the Drell-Yan (DY) process [1], proceeding at tree level via the s-channel exchange of a virtual photon or Z boson, can produce charged lepton pairs over a wide range of invariant mass. The differential cross-section as a function of the invariant mass is described by perturbative QCD (pQCD) calculations at next-to-next-to-leading order (NNLO). Given the simple experimental signature and the low backgrounds, a small experimental uncertainty can be achieved on the measured invariant mass distribution allowing for a precision test of pQCD. The mass spectrum is also sensitive to the parton distribution functions (PDFs), in particular to the poorly known distribution of antiquarks at large x [2], where x can be interpreted, at leading order, as the fraction of the proton momentum carried by the interacting parton. Additionally, the production of DY dilepton pairs is a source of background for other Standard Model (SM) measurements, and the mass spectrum may be modified by new physics phenomena giving rise to, e.g., narrow resonances or an excess of high-mass pairs inconsistent with the known PDFs.The differential cross-section for DY dilepton pair production in the high-mass range has been reported previously by the CMS [3], CDF [4] and D0 [5] Collaborations. With the ATLAS detector, total and differential cross-sections in a mass window of 66-116 GeV have been measured using the 2010 dataset [6]. In addition, searches for new physics in the high-mass range have been performed [7][8][9] and no deviations from the SM expectation were observed. This Letter reports an extension of these previous ✩ © CERN for the benefit of the ATLAS Collaboration.E-mail address: atlas.publications@cern.ch.analyses by providing a measurement of the DY cross-section, fully corrected for detector effects, in the dielectron channel as a function of the e + e − invariant mass, m ee , up to 1500 GeV. To minimise model-dependent theoretical uncertainties, the cross-section is not extrapolated to the full phase space but is reported in a phase space only slightly extended with respect to the fiducial acceptance of the e + and e − . The results are compared to NNLO pQCD calculations with next-to-leading-order (NLO) electroweak corrections from the FEWZ 3.1 [10,11] framework and to the predictions from ...

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“…While the cross section is calculable up to NLO in QCD with existing tools such as mcfm [90], it was seen in the √ s = 7 TeV measurements that the calculation of the Wγ cross section might underestimate the observed value significantly [107,108]. On the other hand, the matrix-element-based event generation with extra partons using sherpa [85] or MadGraph was found to reproduce the key kinematic features of the Vγ events well. Therefore, Wγ and Zγ data sets generated by MadGraph 5, as listed in Tab.…”

Section: Fake Muon Proxiesmentioning

confidence: 97%

“…There are numerous software packages that are capable of parton-shower simulation, such as pythia [83,84], sherpa [85], and herwig [86,87]. pythia 6.4 was used for all simulations in this thesis.…”

Section: Monte-carlo Event Generatorsmentioning

confidence: 99%

Search for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy

Iiyama¹

2017

Springer Theses

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This thesis presents a search for anomalous production of events with at least one photon, one electron or muon, and large missing transverse energy in proton-proton collisions at a center-of-mass energy of 8 TeV. A data set corresponding to an integrated luminosity of 19.7 fb −1 recorded in 2012 by the Compact Muon Solenoid detector at the CERN Large Hadron Collider is analyzed. The search is motivated by a class of supersymmetric extensions of the standard model with gauge-mediated supersymmetry breaking, which predicts decays of supersymmetric particles into a W boson, a photon, and highly energetic gravitinos, which are undetected and lead to a momentum imbalance in the plane transverse to the proton beams. The expected standard model background contributions of events featuring the same final state signature is estimated by separating the background processes into categories and applying estimation techniques tailored for each category. No excess of events with large missing transverse energy is observed beyond the expectations from standard model processes. The result of this search is interpreted as 95% confidence level upper limits on the production cross section of supersymmetric particles as well as generic new-physics particles in two simplified models. The cross section upper limits set by this search pose the most stringent constraint to date on the considered supersymmetric models.

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Event generation with SHERPA 1.1

Cited by 1,946 publications

References 185 publications

$$Z\gamma $$ Z γ production in association with two jets at next-to-leading order QCD

$$Z\gamma $$ Z γ production in association with two jets at next-to-leading order QCD

Measurement of the high-mass Drell–Yan differential cross-section in pp collisions at s=7 TeV with the ATLAS detector

Search for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy

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