Event shapes in e<sup>+</sup>e<sup> </sup>annihilation and deep inelastic scattering

Dasgupta, Mrinal; Salam, Gavin P.

doi:10.1088/0954-3899/30/5/r01

Cited by 160 publications

(243 citation statements)

References 243 publications

(429 reference statements)

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“…This form of matching is referred to as ln(R)-matching. Other forms of matching are possible with small differences in the treatment of higher order terms [30,34,35]. An important difference between the ln(R)-matching and other matching schemes is that in the other schemes the coefficients C 1 and C 2 and in some cases G 21 must be known explicitly.…”

Section: Fixed Order Predictionsmentioning

confidence: 99%

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Tests of quantum chromo dynamics at e⁺e⁻ colliders

Kluth¹

2006

Rep. Prog. Phys.

107

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Abstract.The current status of tests of the theory of strong interactions, Quantum Chromo Dynamics (QCD), with data from hadron production in e + e − annihilation experiments is reviewed. The LEP experiments ALEPH, DELPHI, L3 and OPAL have published many analyses with data recorded on the Z 0 resonance at √ s = 91.2 GeV and above up to √ s > 200 GeV. There are also results from SLD at √ s = 91.2 GeV and from reanalysis of data recorded by the JADE experiment at 14 ≤ √ s ≤ 44 GeV. The results of studies of jet and event shape observables, of particle production and of quark gluon jet differences are compared with predictions by perturbative QCD calculations. Determinations of the strong coupling constant α S (m Z 0 ) from jet and event shape observables, scaling violation and fragmentation functions, inclusive observables from Z 0 decays, hadronic τ decays and hadron production in low energy e + e − annihilation are discussed. Updates of the measurements are performed where new data or improved calculations have become available. The best value of α S (m Z 0 ) is obtained from an average of measurements using inclusive observables calculated in NNLO QCD: α S (m Z 0 ) = 0.1211 ± 0.0021 where the error is dominated by theoretical systematic uncertainties. The other measurements of α S (m Z 0 ) are in good agreement with this value. Finally, investigations of the gauge structure of QCD are summarised and the best values for the colour factors are determined: C A = 2.89 ± 0.21 C F = 1.30 ± 0.09 with errors dominated by systematic uncertainties and in good agreement with the expectation from QCD with the SU(3) gauge symmetry.

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Section: Fixed Order Predictionsmentioning

confidence: 99%

“…In order to force the NLLA terms to vanish at the upper kinematic limit y max of an observable y the so-called modified matching is used [30,35]. The modified matching consists of replacing L = ln(1/y) by L ′ = ln(1 + 1/y − 1/y max ).…”

Section: Fixed Order Predictionsmentioning

confidence: 99%

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Kluth¹

2006

Rep. Prog. Phys.

107

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“…High-quality data, primarily from LEP measurements at the Z-pole, open up an opportunity to perform very accurate studies in jet physics [32]. Since, by now, gross features of QCD are well understood, the interest shifts towards subtle details which can be revealed only through dealing with complicated final states and improving the accuracy of theoretical predictions.…”

Section: Introductionmentioning

confidence: 99%

NLO QCD corrections to five-jet production at LEP and the extraction of α s (M Z )

Frederix

Frixione

Melnikov

et al. 2010

J. High Energ. Phys.

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Abstract:The highest exclusive jet multiplicity studied at LEP experiments is five. In this paper we compute the next-to-leading order QCD corrections to e + e − annihilation to five jets, essentially closing the (pure) perturbative QCD studies of exclusive jetty final states at LEP. We compare fixed-order perturbative results with ALEPH data. We estimate hadronization corrections to five-jet observables using the event generator SHERPA, which employs the CKKW procedure to combine a reliable perturbative treatment of highmultiplicity jet final states with parton showers. We show that a competitive value of the strong coupling constant α s (M Z ) = 0.1156 +0.0041 −0.0034 can be extracted from the distribution of the five-jet resolution parameter and the five-jet rate at LEP1 and LEP2.

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“…Another important aspect of QCD phenomenology is the all-order resummation of particular classes of observables or processes, beyond the leading-logarithmic (LL) accuracy, which is typical for parton showers. Event shapes in electron-positron, electron-proton and hadron-hadron collisions have been studied for a long time (see for instance [45,46] and references therein) and a general framework for resumming event shapes at next-to-leading logarithmic (NLL) accuracy was developed in refs. [47][48][49][50].…”

Section: Jhep02(2015)106mentioning

confidence: 99%

Soft evolution of multi-jet final states

Gerwick

Schumann

Höche

et al. 2015

J. High Energ. Phys.

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We present a new framework for computing resummed and matched distributions in processes with many hard QCD jets. The intricate color structure of soft gluon emission at large angles renders resummed calculations highly non-trivial in this case. We automate all ingredients necessary for the color evolution of the soft function at next-toleading-logarithmic accuracy, namely the selection of the color bases and the projections of color operators and Born amplitudes onto those bases. Explicit results for all QCD processes with up to 2 → 5 partons are given. We also devise a new tree-level matching scheme for resummed calculations which exploits a quasi-local subtraction based on the Catani-Seymour dipole formalism. We implement both resummation and matching in the Sherpa event generator. As a proof of concept, we compute the resummed and matched transverse-thrust distribution for hadronic collisions.

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Event shapes in e⁺eannihilation and deep inelastic scattering

Abstract: Abstract. This article reviews the status of event-shape studies in e + e − annihilation and DIS. It includes discussions of perturbative calculations, of various approaches to modelling hadronisation and of comparisons to data.

Cited by 160 publications

References 243 publications

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Tests of quantum chromo dynamics at e⁺e⁻ colliders

NLO QCD corrections to five-jet production at LEP and the extraction of α s (M Z )

Soft evolution of multi-jet final states

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Event shapes in e+e annihilation and deep inelastic scattering

Abstract: Abstract. This article reviews the status of event-shape studies in e + e − annihilation and DIS. It includes discussions of perturbative calculations, of various approaches to modelling hadronisation and of comparisons to data.

Cited by 160 publications

References 243 publications

Tests of quantum chromo dynamics at e+e− colliders

Tests of quantum chromo dynamics at e+e− colliders

NLO QCD corrections to five-jet production at LEP and the extraction of α s (M Z )

Soft evolution of multi-jet final states

Contact Info

Product

Resources

About

Event shapes in e⁺eannihilation and deep inelastic scattering

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Tests of quantum chromo dynamics at e⁺e⁻ colliders