A QCD analysis of the high energy e+e− data from PETRA

Ali, Ahmed; Pietarinen, E.; Krämer, G.; Willrodt, J.

doi:10.1016/0370-2693(80)90116-1

Cited by 176 publications

(31 citation statements)

References 21 publications

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“…In this and in a number of similar plots, the number of three-jet events is everywhere larger than that of four-jet events. Nevertheless, subtracting from the experimental data the qq and the qqg contributions according to the QCD model of Ali et al [63] there remains a total of 36 four-jet events, in good agreement with the expectation for four-jet events from the QCD model calculation.…”

Section: Four-jet Analysissupporting

confidence: 81%

“…The PLUTO Collaboration chooses that of Hoyer et al [62], while the TASSO Collaboration uses that of Ali et al [63], including in particular the improvements by Sander and Meyer on the Field-Feynman fragmentation [64] and the recent calculations of radiative corrections by Berends and Kleiss [65]. Since a, measures the quark-gluon coupling, the experimental data used must be those where the gluon plays a significant role.…”

Section: Tasso Methods Of Three-jet Analysismentioning

confidence: 99%

“…The first value may be compared with the PLUTO result It should be pointed out that in the QCD model of Ali et al [63], up to order of a i , all the bremsstrahlung diagrams are included but not the virtual correction diagrams. Hence we must emphasize that this value of a, should be taken within the context of the QCD model used.…”

Section: Tasso Methods Of Three-jet Analysismentioning

confidence: 99%

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Lignins as Components of Polymeric Composite Materials

Lyubeshkina¹

1983

Russ. Chem. Rev.

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Selected topics of recent experimental results from the high-energy electron-positron storage rings are presented. The topics include some of the T and charm physics from SPEAR, the upsilon physics from DORIS and CESR, and the 77 physics and quark and gluon physics from the PLUTO and TASSO Collaborations at PETRA. Related data from the JADE and MARK J Collaborations at PETRA are discussed in separate papers at this School.

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Section: Four-jet Analysissupporting

confidence: 81%

Section: Tasso Methods Of Three-jet Analysismentioning

confidence: 99%

Section: Tasso Methods Of Three-jet Analysismentioning

confidence: 99%

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Lignins as Components of Polymeric Composite Materials

Lyubeshkina¹

1983

Russ. Chem. Rev.

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“…It introduced an iterative recipe for the construction of realistic jets. By considering each outgoing parton separately, it became possible to write ''independent fragmentation'' generators for e + e − physics [161,162]. 14 These models soon became outdated since the independent fragmentation framework is not Lorentz invariant, is not safe under collinear emissions of partons, and also suffers from other deficiencies [163].…”

Section: Definition and Early Developmentsmentioning

confidence: 99%

General-purpose event generators for LHC physics

et al. 2011

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We review the physics basis, main features and use of general-purpose Monte Carlo event generators for the simulation of proton-proton collisions at the Large Hadron Collider. Topics included are: the generation of hard-scattering matrix elements for processes of interest, at both leading and next-to-leading QCD perturbative order; their matching to approximate treatments of higher orders based on the showering approximation; the parton and dipole shower formulations; parton distribution functions for event generators; non-perturbative aspects such as soft QCD collisions, the underlying event and diffractive processes; the string and cluster models for hadron formation; the treatment of hadron and tau decays; the inclusion of QED radiation and beyond-Standard-Model processes. We describe the principal features of the ARIADNE, Herwig++, PYTHIA 8 and SHERPA generators, together with the Rivet and Professor validation and tuning tools, and discuss the physics philosophy behind the proper use of these generators and tools. This review is aimed at phenomenologists wishing to understand better how parton-level predictions are translated into hadron-level events as well as experimentalists wanting a deeper insight into the tools available for signal and background simulation at the LHC.Comment: 226 pages, 30 figures, submitted to Physics Report

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“…The Field-Feynman scheme is used in the models of Hoyer et al 3S and Ali et al 30 to fragment partons produced by e+ e-annihilations. After using QeD perturbation theory to produce a primordial qq, qqg, qqgg or qqqq state, these models fragment each of the quarks and gluons independently.…”

mentioning

confidence: 99%

Comparison of three-jet and radiative two-jet events in electron-positron annihilation at 29 GeV

Sheldon¹

1986

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By comparing 3-jet (e+ e--+ qqg) and radiative 2-jet (e+ e--+ qq"Y) events from electron-positron annihilation, we have studied the local and global effects of the presence of a hard bremsstrahlung gluon in hadronic events. Detector and event selection efficiencies and biases affect these two kinds of events almost equally because they have very similar kinematics and topologies. Accurate comparisons of qqg and qq"Y events can therefore be made.Globally, we observe a depletion of hadrons in qqg events relative to qq"Y events on the opposite side of the event plane from the gluon, in the angular region between the q and q jets. This depletion is shown to be in agreement with the predictions of Quantum Chromo dynamics (QCD). The ,existence of this effect demonstrates that the presence of a gluon significantly alters the color forces and hence the fragmentation process in hadronic events.We also use these qq"Y and qqg events to compare low energy (4.5 Ge V) gluon and quark jets. Our data indicate that gluon jets have softer xp distributions than quark jets, while the transverse momentum distributions of these two types of jets are identical within our errors. Although we are unable to determine if the multiplicities of gluon (ng) and quark (nq) jets are different, the ratio ng / nq = 9/4 predicted asymptotically in QCD would not be consistent with our data.

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A QCD analysis of the high energy e+e− data from PETRA

Cited by 176 publications

References 21 publications

Lignins as Components of Polymeric Composite Materials

Lignins as Components of Polymeric Composite Materials

General-purpose event generators for LHC physics

Comparison of three-jet and radiative two-jet events in electron-positron annihilation at 29 GeV

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