CompHEP 4.4—automatic computations from Lagrangians to events

Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Edneral, V. F.; Ilyin, V.; Kryukov, Alexander; Savrin, V.; Семенов, А.; Sherstnev, A.

doi:10.1016/j.nima.2004.07.096

Cited by 589 publications

(510 citation statements)

References 37 publications

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“…there are several automated computer programs [135,136,128,137] that can, at leading order, calculate any process in the Standard Model and its most popular extensions. Given the scope of the LHC physics program and the benefits of improving the reliability of theoretical predictions, automating one-loop computations is considered to be an important goal in phenomenologically-oriented high-energy theory and it took about ten years of active research of many physicists to get close to accomplishing this goal.…”

Section: Discussionmentioning

confidence: 99%

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

et al. 2012

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The success of the experimental program at the Tevatron re-inforced the idea that precision physics at hadron colliders is desirable and, indeed, possible. The Tevatron data strongly suggests that one-loop computations in QCD describe hard scattering well. Extrapolating this observation to the LHC, we conclude that knowledge of many short-distance processes at next-to-leading order may be required to describe the physics of hard scattering. While the field of oneloop computations is quite mature, parton multiplicities in hard LHC events are so high that traditional computational techniques become inefficient. Recently new approaches based on unitarity have been developed for calculating one-loop scattering amplitudes in quantum field theory. These methods are especially suitable for the description of multi-particle processes in QCD and are amenable to numerical implementations. We present a systematic pedagogical description of both conceptual and technical aspects of the new methods.

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Section: Discussionmentioning

confidence: 99%

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

et al. 2012

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“…As these new generators evolve and undergo extensive testing and validation, they are expected to enter the production shortly and eventually supersede their FORTRAN predecessors. Some production was also done with MadGraph [37] (vector boson scattering), CHARYBDIS [38] (black hole event generation), and CompHep [39,40] (specific exotic physics models). Discussion of the generation of cavern background, beam halo, and beam gas events follow in Sects.…”

Section: Event Generation Overviewmentioning

confidence: 99%

The ATLAS Simulation Infrastructure

Aad¹,

Abbott²,

Abdallah³

et al. 2011

The Performance of the ATLAS Detector

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618

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The simulation software for the ATLAS Experiment at the Large Hadron Collider is being used for largescale production of events on the LHC Computing Grid. This simulation requires many components, from the generators that simulate particle collisions, through packages simulating the response of the various detectors and triggers. All of these components come together under the AT-LAS simulation infrastructure. In this paper, that infrastructure is discussed, including that supporting the detector description, interfacing the event generation, and combining the GEANT4 simulation of the response of the individual detectors. Also described are the tools allowing the software validation, performance testing, and the validation of the simulated output against known physics processes.

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“…using CompHEP 4.4 [22], interfaced with Pythia 6.4 [23] through the CPyth toolkit 2.0.6 [24]. Pythia has been run with power showers and including stop fragmentation and hadronization [25] before decayt 1 → c +χ 0 1 .…”

Section: Stops In the γ + E / T Channelmentioning

confidence: 99%

Light stop searches at the LHC in events with one hard photon or jet and missing energy

Carena

Freitas

Wagner

2008

J. High Energy Phys.

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Low energy supersymmetric models provide a solution to the hierarchy problem and also have the necessary ingredients to solve two of the most outstanding issues in cosmology: the origin of the baryon asymmetry and the source of dark matter. In the MSSM, weak scale generation of the baryon asymmetry may be achieved in the presence of light stops, with masses lower than about 130 GeV. Moreover, the proper dark matter density may be obtained in the stop-neutralino co-annihilation region, where the stop-neutralino mass difference is smaller than a few tens of GeV. Searches for scalar top quarks (stops) in pair production processes at the Tevatron and at the Large Hadron Collider (LHC) become very challenging in this region of parameters. At the LHC, however, light stops proceeding from the decay of gluino pairs may be identified, provided the gluino mass is smaller than about 900 GeV. In this article we propose an alternative method for stop searches in the co-annihilation region, based on the search for these particles in events with missing energy plus one hard photon or jet. We show that this method is quite efficient and, when complemented with ongoing Tevatron searches, allows to probe stop masses up to about 160 GeV, fully probing the region of parameters consistent with electroweak baryogenesis in the MSSM. * Very recently, however, it was proposed that the reach of the Tevatron for small mass differences could be extended by not requiring full reconstruction of the two charm jets [10].

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CompHEP 4.4—automatic computations from Lagrangians to events

Cited by 589 publications

References 37 publications

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

The ATLAS Simulation Infrastructure

Light stop searches at the LHC in events with one hard photon or jet and missing energy

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