Measurement Of Charged Particle Multiplicities In Gluon And Quark Jets In Proton Anti Proton Collisions At S1 2 PDF Download
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Total Pages | : 7 |
Release | : 2004 |
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Download Measurement of Charged Particle Multiplicities in Gluon and Quark Jets in Proton Anti-proton Collisions at S**1/2 Book in PDF, ePub and Kindle
The authors report the first model independent measurement of charged particle multiplicities in quark and gluon jets, N{sub q} and N{sub g}, produced at the Tevatron in p{bar p} collisions with center-of-mass energy 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies 41 and 53 GeV by counting charged particle tracks in cones with opening angle of [theta]{sub c} = 0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q = E{sub jet}[theta]{sub c} varies in the range from 12 GeV to 25 GeV. At Q = 19 GeV, the ratio of multiplicities r = N{sub g}/N{sub q} is found to be 1.64 ± 0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with re-summed perturbative QCD calculations.
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Total Pages | : 7 |
Release | : 2004 |
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Download Measurement of Charged Particle Multiplicities in Gluon and Quark Jets in Proton Anti-proton Collisions at S**ư Book in PDF, ePub and Kindle
The authors report the first model independent measurement of charged particle multiplicities in quark and gluon jets, N{sub q} and N{sub g}, produced at the Tevatron in p{bar p} collisions with center-of-mass energy 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies 41 and 53 GeV by counting charged particle tracks in cones with opening angle of?{sub c} = 0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q = E{sub jet}?{sub c} varies in the range from 12 GeV to 25 GeV. At Q = 19 GeV, the ratio of multiplicities r = N{sub g}/N{sub q} is found to be 1.64 ± 0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with re-summed perturbative QCD calculations.
Author | : Alexandre P. Pronko |
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Total Pages | : |
Release | : 2005 |
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Download Fragmentation of Quark and Gluon Jets in Proton-antiproton Collisions at Center-of-mass Energy of 1.8 TeV Book in PDF, ePub and Kindle
ABSTRACT: We report the first model independent measurement of charged particle multiplicities in quark and gluon jets, Nq_ and Ng_, produced at the Tevatron in proton-antiproton collisions with center-of-mass energy 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies 41 and 53 GeV by counting charged particle tracks in cones with opening angle of thetac_=0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q=Ej_et*thetac_ varies in the range from 12 GeV to 25 GeV. At Q=19.2 GeV, the ratio of multiplicities r=Ng_/Nq_ is found to be 1.64"0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with re-summed perturbative QCD calculations and are consistent with recent ee− measurements.
Author | : Peter A. Carruthers |
Publisher | : World Scientific |
Total Pages | : 714 |
Release | : 1988 |
Genre | : Science |
ISBN | : 9789971505585 |
Download Hadronic Multiparticle Production Book in PDF, ePub and Kindle
http://www.worldscientific.com/worldscibooks/10.1142/0492
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Total Pages | : 23 |
Release | : 2016 |
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Download Measurement of the Charged-particle Multiplicity Inside Jets from $$\sqrt{s} Book in PDF, ePub and Kindle
The number of charged particles inside jets is a widely used discriminant for identifying the quark or gluon nature of the initiating parton and is sensitive to both the perturbative and non-perturbative components of fragmentation. This paper presents a measurement of the average number of charged particles with pT > 500 MeV inside high-momentum jets in dijet events using 20.3 fb-1 of data recorded with the ATLAS detector in pp collisions at √s=8 TeV collisions at the LHC. The jets considered have transverse momenta from 50 GeV up to and beyond 1.5 TeV . The reconstructed charged-particle track multiplicity distribution is unfolded to remove distortions from detector effects and the resulting charged-particle multiplicity is compared to several models. Lastly, quark and gluon jet fractions are used to extract the average charged-particle multiplicity for quark and gluon jets separately.
Author | : Robert Michael Snihur |
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Release | : 2000 |
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Download Subjet Multiplicity of Quark and Gluon Jets Reconstructed with the K̳ Algorithm in P−p Collisions Book in PDF, ePub and Kindle
This thesis presents some of the first experimental results of the k⊥ jet algorithm at a hadron collider. Gluon jets dominate the final state of proton-antiproton (pp¯) collisions at high center-of-mass energies ( s = 1800 GeV). Quark jets make up a significant fraction of the jet cross section only at high jet transverse momentum pT or low s . For fixed pT, we compare jets at s = 1800 GeV to s = 630 GeV, and interpret differences in terms of differing contributions from gluon and quark jets. We define jets with a successive combination algorithm based on relative transverse momenta ( k⊥ ). To study jet structure, the k⊥ algorithm is then applied within the jet to resolve subjets. We measure the number of subjets within mixed quark and gluon jet samples at s = 1800 and 630 GeV. A simple method is used to extract measurements of pure quark and gluon jet samples separately. The method requires knowledge of the relative mix of quarks and gluons in the two s samples, which we derive from Monte Carlo and a detailed detector simulation. The number of subjets emitted in gluon jets is measured to be approximately twice that in quark jets.
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Release | : 2013 |
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Download Search for the Production of ZW and ZZ Boson Pairs Decaying Into Charged Leptons and Jets in Proton-antiproton Collisions at Sqrt[s] Book in PDF, ePub and Kindle
We present a measurement of the production cross section for ZW and ZZ boson pairs in final states with a pair of charged leptons, from the decay of a Z boson, and at least two jets, from the decay of a W or Z boson, using the full sample of proton-antiproton collisions recorded with the CDF II detector at the Tevatron, corresponding to 8.9 fb(̂-1) of integrated luminosity. We increase the sensitivity to vector boson decays into pairs of quarks using a neural network discriminant that exploits the differences between the spatial spread of energy depositions and charged-particle momenta contained within the jet of particles originating from quarks and gluons. Additionally, we employ new jet energy corrections to Monte Carlo simulations that account for differences in the observed energy scales for quark and gluon jets. The number of signal events is extracted through a simultaneous fit to the dijet mass spectrum in three classes of events: events likely to contain jets with a heavy-quark decay, events likely to contain jets originating from light quarks, and events that fail these identification criteria. We determine the production cross section to be 2.5 +2.0 -1.0 pb (
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Total Pages | : 716 |
Release | : 1990 |
Genre | : Nuclear physics |
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Download High Energy Physics Index Book in PDF, ePub and Kindle
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Total Pages | : 648 |
Release | : 1988 |
Genre | : Power resources |
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Download Energy Research Abstracts Book in PDF, ePub and Kindle
Author | : Clara Elizabeth Kuehn |
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Total Pages | : 484 |
Release | : 1984 |
Genre | : Pions |
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Download Measurement of the Leading Charged Particle Charge Ratios in High Transverse Momentum Proton-proton and Pion-proton Collisions Book in PDF, ePub and Kindle