Experience with the L3 vertex drift chamber at LEP

Anderhub, H.; Beißel, F.; Betev, B. L.; Biland, A.; Böhm, A.; Bourilkov, D.; Camps, C.; Commichau, V.; Djambazov, L.; Göttlicher, P.; Hangarter, K.; Hofer, H.; Holzner, A.; Horisberger, U.; Kopp, A. K.; Leiste, R.; Lohmann, W.; Lustermann, W.; Mnich, J.; Paus, C.; Pohl, M.; Rahal, G.; Röser, U.; Sassowsky, M.; Schäfer, C.; Schmidt-Kärst, A; Schmitz, P.; Spickermann, T.; Straessner, A.; Suter, H.; Szczesny, H.; Viertel, G.; Vogt, H.; Gunten, H. P. Von; Waldmeier, S.; Weber, M.; Wienemann, P.

doi:10.1016/j.nima.2003.08.126

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…We have used data with an integrated luminosity of 47.97 pb −1 collected with the L3 detector [24][25][26][27] The primary trigger for e + e − → hadrons events require a total energy greater than 15 GeV in the calorimeters. This trigger is in logical OR with a trigger using the barrel scintillation counters and with a charged-track trigger.…”

Section: Event Selectionmentioning

confidence: 99%

Generalized event shape and energy flow studies in e+e− annihilation at $ \sqrt {s} = 91.2{ - }208.0 $ GeV

Achard¹,

Adriani²,

Aguilar-Benı́tez³

et al. 2011

J. High Energ. Phys.

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Abstract:We present results from a study of hadronic event structure in high energy e + e − interactions using the L3 detector at LEP. A new class of event shape distributions are measured at and above the Z boson pole for light quark (u, d, s, c) flavours. Energy flow correlations are studied for all hadronic events. Next-to-leading-log QCD calculations and QCD models with improved leading-log approximations are compared to data and good agreement is found at the Z-pole whereas some discrepancies are observed at higher centre-of-mass energies.

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Section: Event Selectionmentioning

confidence: 99%

Generalized event shape and energy flow studies in e+e− annihilation at $ \sqrt {s} = 91.2{ - }208.0 $ GeV

Achard¹,

Adriani²,

Aguilar-Benı́tez³

et al. 2011

J. High Energ. Phys.

Self Cite

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“…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.…”

Section: Global Event Shape Variablesmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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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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“…29). The octagonshaped solenoid had an effective length close to 12 m and a bore of 11.4 m, and could reach a field of 0.5 T. Close to the beam pipe, a Time Expansion Chamber served as main charged particle tracker, providing the reconstruction of the primary and secondary interaction points, the particle momentum and event multiplicity with a double track resolution better than 500 µm [36] (Fig. 30).…”

Section: General Purpose Detectors At Lepmentioning

confidence: 99%

From bubble chambers to electronic systems: 25 years of evolution in particle detectors at CERN (1979–2004)

Sauli

2004

Physics Reports

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The European Organization for Nuclear Research (CERN) celebrates in October 2004 its 50 th anniversary. A centre of excellence for elementary particle physics research, the laboratory has contributed to the development of advanced technologies for the construction of powerful accelerators and experiments. As a follow-up of the article published by this journal in 1980, on the occasion of CERN's 25 th anniversary, this contribution describes the developments of particle detectors and experimental setups that took place in the laboratory during the last twenty-five years.

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Experience with the L3 vertex drift chamber at LEP

Cited by 7 publications

References 12 publications

Generalized event shape and energy flow studies in e+e− annihilation at $ \sqrt {s} = 91.2{ - }208.0 $ GeV

Generalized event shape and energy flow studies in e+e− annihilation at $ \sqrt {s} = 91.2{ - }208.0 $ GeV

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

From bubble chambers to electronic systems: 25 years of evolution in particle detectors at CERN (1979–2004)

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