Experimental studies on multijet production ine + e ? annihilation at PETRA energies

Bartel, W.; Becker, L.; Felst, R.; Haidt, D.; Knies, G.; Krehbiel, H.; Laurikainen, P.; Magnussen, N.; Meinke, R.; Naroska, B.; Olsson, J. E.; Schmidt, D.; Dietrich, G.; Greenshaw, T.; Hagemann, J.; Heinzelmann, G.; Kado, H.; Kleinwort, C.; Kuhlen, M.; Petersen, A.; Ramcke, R.; Schneekloth, U.; Weber, G.; Ambrus, K.; Bethke, S.; Dieckmann, A.; Elsen, E.; Heintze, J.; Hellenbrand, K. H.; Komamiya, S.; Krogh, J. von; Rieseberg, H.; Schmitt, H. von der; Smolík, L.; Spitzer, J.; Wagner, A.; Zimmer, M.; Bowdery, C. K.; Finch, A. J.; Foster, F.; Hughes, G.; Nye, J. M.; Allison, J.; Barlow, R. J.; Chrin, J.; Duerdoth, I. P.; Loebinger, F. K.; Macbeth, A. A.; Mills, H. E.; Murphy, P. G.; Stephens, K.; Warming, P.; Glasser, R. G.; Hill, P.; Skard, J. A.; Wagner, S. R.; Zorn, G. T.; Cartwright, S. L.; Clarke, D.; Marshall, R.; Middleton, R. P.; Kawagoe, K.; Mäshimo, T.; Takeshita, T.; Yamada, S.

doi:10.1007/bf01410449

Cited by 393 publications

(39 citation statements)

References 14 publications

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“…All of these strongly logarithmically enhanced terms should be consistent with the exponential form. 4 Certain observables, notably JADE jet-resolution thresholds [33], for which the first logarithmically enhanced terms have been calculated [34,35], have been explicitly found to be inconsistent with exponentiation. So far no observable of this kind has been resummed, even at LL accuracy.…”

Section: Structure Of Results and Nature Of Approachmentioning

confidence: 99%

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Principles of general final-state resummation and automated implementation

Banfi

Salam

Zanderighi

2005

J. High Energy Phys.

273

620

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Next-to-leading logarithmic final-state resummed predictions have traditionally been calculated, manually, separately for each observable. In this article we derive NLL resummed results for generic observables. We highlight and discuss the conditions that the observable should satisfy for the approach to be valid, in particular continuous globalness and recursive infrared and collinear safety. The resulting resummation formula is expressed in terms of certain well-defined characteristics of the observable. We have written a computer program, caesar, which, given a subroutine for an arbitrary observable, determines those characteristics, enabling full automation of a large class of final-state resummations, in a range of processes.

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Section: Structure Of Results and Nature Of Approachmentioning

confidence: 99%

“…Of particular interest is the family of JADE algorithms [33] because it represents the only example of an observable for which the double logarithms have been found, analytically, not to exponentiate [34,35]. Taking the definition used in [34], the distance measure is…”

Section: D1 Jade Jet Algorithm: E-schemementioning

confidence: 99%

Principles of general final-state resummation and automated implementation

Banfi

Salam

Zanderighi

2005

J. High Energy Phys.

273

620

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“…The Jade algorithm [22] offered a further simplification, in that only the binary joining was retained, without preclustering or reassignment. The choice of distance measure was based on invariant mass, corresponding to what was available in most O(α 2 S ) calculations of the time [23].…”

Section: Jhep08(1998)001mentioning

confidence: 99%

New and old jet clustering algorithms for electron-positron events

Moretti¹,

Lönnblad²,

Sjöstrand³

1998

J. High Energy Phys.

106

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“…Jets are reconstructed using the JADE algorithm [26,27]. The value of the "closeness variable" at which the classification of an event changes from 2-jet to 3-jet is called the 3-jet resolution parameter .…”

Section: Jet Resolution Parametermentioning

confidence: 99%

Study of hadronic event shape in flavour tagged events in e+e- annihilation at "Equation missing" = 197 GeV

Mele

2008

PMC Phys A

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Results are presented from a study of the structure of hadronic events in high-energy e + e -interactions detected by the L3 detector at LEP. Various event shape distributions and their moments are measured at several energy points at and above the Z-boson mass. The event flavour is tagged by using the decay characteristics of b-hadrons. Measurements of distributions of event shape variables for all hadronic events, for light (u, d, s, c) and heavy (b) quark flavours are compared to several QCD models with improved leading log approximation: JETSET, HERWIG and ARIADNE. A good description of the data is provided by the models.PACS Codes: 12.38.Qk, 13.66.Bc IntroductionHadronic events produced in e + e -annihilation have been a powerful tool to test the predictions of Quantum Chromodynamics (QCD) [1][2][3][4][5]. Perturbative QCD successfully accounts for many aspects of the hadronic decays of the Z boson [6]. The primary quarks from Z-boson decays first radiate gluons, which in turn may split into quark or gluon pairs. The quark and gluons then fragment into observable hadrons. Perturbative QCD itself does not describe the fragmentation process. Instead several phenomenological models have been developed to describe fragmentation. These models provide a way to correct for the effects of fragmentation in the experimental data, which can then be compared with the perturbative QCD calculations directly.The event shape variables which characterize the global structure of hadronic events are among the simplest experimental measurements sensitive to the parameters of perturbative QCD and fragmentation models. This article reports on the measurement of event shapes for hadronic events collected at LEP by the L3 detector [7][8][9][10] at e + e -centre-of-mass energies  189 GeV.Similar analyses were reported by all LEP experiments [11][12][13][14][15].Heavy flavour production in e + e -annihilation can be studied by exploiting the characteristics of heavy flavour decays. In the present study, hadronic events are separated into heavy (b) and light (u, d, s, c) flavours, and event shape variables are separately measured for these final states. This allows to test the modelling of heavy flavour mass effects. Earlier and similar measurements, at lower centre-of-mass energies, are reported in References [11] and [16]. Global event shape variablesEvent shape variables, insensitive to soft and collinear radiation, are built from linear sums of measured particle momenta. They are sensitive to the amount of hard-gluon radiation. Six global event shape variables are measured here, using calorimetric and tracking information measured as described in References [7][8][9][10] and [11]. They are: thrust, scaled heavy jet mass, total and wide jet broadening, the C-parameter and the jet resolution parameter. These event-shape variables are defined below. ThrustThe global event-shape variable thrust, T, [17,18] is defined as where is the momentum vector of particle i. The thrust axis is the unit vector which maximizes the abov...

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Experimental studies on multijet production ine + e ? annihilation at PETRA energies

Cited by 393 publications

References 14 publications

Principles of general final-state resummation and automated implementation

Principles of general final-state resummation and automated implementation

New and old jet clustering algorithms for electron-positron events

Study of hadronic event shape in flavour tagged events in e+e- annihilation at "Equation missing" = 197 GeV

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