Hadron production by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>annihilation at center-of-mass energies between 2.6 and 7.8 GeV. II. Jet structure and related inclusive distributions

Hanson, G.; Alam, M. S.; Boyarski, A. M.; Breidenbach, M.; Bulos, F.; Dakin, J.T.; Dorfan, J.; Feldman, G. J.; Fischer, G.; Fryberger, D.; Hartill, D. L.; Jaros, J. A.; Jean‐Marie, B.; Larsen, R. R.; Lüth, V.; Lynch, H. L.; Lyon, D.; Morehouse, C. C.; Paterson, J. M.; Перл, М.; Peruzzi, I.; Piccolo, M.; Pun, T. P.; Rapidis, P. A.; Richter, B.; Schindler, R.H.; Schwitters, R. F.; Siegrist, J.; Tanenbaum, W.; Vannucci, F.; Abrams, G. S.; Briggs, D.; Carithers, W.; Chinowsky, W.; Cooper, S.; DeVoe, R.; Friedberg, C. E.; Goldhaber, G.; Hollebeek, R. J.; Johnson, A. D.; Kadyk, J. A.; Litke, A. M.; Madaras, R. J.; Nguyen, H. K.; Pierre, F.; Sadoulet, B.; Trilling, G. H.; Whitaker, J. S.; Winkelmann, F.C.; Wiss, J.

doi:10.1103/physrevd.26.991

Cited by 24 publications

(7 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Distributions of Sphericity values and angular distributions of jet directions given by the Sphericity axis were compared with jet model and phase space Monte Carlo simulations. This evidence was further supported in [144][145][146]. QCD as the field theory of quark interactions predicts the existence of gluons as intermediate gauge bosons analogous to the photons of QED.…”

Section: Highlights Of Qcd Before the Lep Aerasupporting

confidence: 58%

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Kluth¹

2006

Rep. Prog. Phys.

107

View full text Add to dashboard Cite

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.

show abstract

Section: Highlights Of Qcd Before the Lep Aerasupporting

confidence: 58%

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Kluth¹

2006

Rep. Prog. Phys.

107

View full text Add to dashboard Cite

show abstract

“…It should be noticed that all these happened at the time when Quantum Chromodynamics (QCD) was emerging [46,47] (see also Ref. [48] for the development of QCD) and asymptotic freedom was just discovered [49,50], but well before the experimental discovery of jets [51,52]. Of course now the well-known concept of Quark and Gluon Plasma (QGP) [53] was even not existing among the community.…”

Section: Early Daysmentioning

confidence: 99%

“…locity gradient of the expanding system. The longitudinal velocity gradient in a high energy nuclear collision decreases with time as 1/τ [52]. Therefore, the magnitude of R long is proportional to the total duration of the longitudinal expansion, i.e.…”

Section: Direct Photons and Pion Femtoscopy Measurementsmentioning

confidence: 99%

Hydrodynamic approaches in relativistic heavy ion reactions

Souza

Koide²,

Kodama³

2016

Progress in Particle and Nuclear Physics

190

208

View full text Add to dashboard Cite

We review several facets of the hydrodynamic description of the relativistic heavy ion collisions, starting from the historical motivation to the present understandings of the observed collective aspects of experimental data, especially those of the most recent RHIC and LHC results. In this report, we particularly focus on the conceptual questions and the physical foundations of the validity of the hydrodynamic approach itself. We also discuss recent efforts to clarify some of the points in this direction, such as the various forms of derivations of relativistic hydrodynamics together with the limitations intrinsic to the traditional approaches, variational approaches, known analytic solutions for special cases, and several new theoretical developments. Throughout this review, we stress the role of course-graining procedure in the hydrodynamic description and discuss its relation to the physical observables through the analysis of a hydrodynamic mapping of a microscopic transport model. Several questions to be answered to clarify the physics of collective phenomena in the relativistic heavy ion collisions are pointed out.

show abstract

“…To give credence to the latter assumption, we observe that in the annihilation process e + e − → hX, experimental data [24,25] beyond z ≈ 0.5 at W = 3 GeV (W ′ = 1.94 GeV) were historically described in terms of fragmentation functions. The region extends to z ≥ 0.2 for W = 4.8 GeV (W ′ = 2.84 GeV) and to z ≥ 0.1 for W = 7.4 GeV (W ′ = 4.14 GeV).…”

Section: B Factorizationmentioning

confidence: 99%

Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Asaturyan¹,

Ent²,

Mkrtchyan³

et al. 2012

Phys. Rev. C

View full text Add to dashboard Cite

A large set of cross sections for semi-inclusive electroproduction of charged pions (π ± ) from both proton and deuteron targets was measured. The data are in the deep-inelastic scattering region with invariant mass squared W 2 > 4 GeV 2 (up to ≈ 7 GeV 2 ) and range in four-momentum transfer squared 2 < Q 2 < 4 (GeV/c) 2 , and cover a range in the Bjorken scaling variable 0.2 < x < 0.6. The fractional energy of the pions spans a range 0.3 < z < 1, with small transverse momenta with respect to the virtual-photon direction, P 2 t < 0.2 (GeV/c) 2 . The invariant mass that goes undetected, Mx or W ′ , is in the nucleon resonance region, W ′ < 2 GeV. The new data conclusively show the onset of quark-hadron duality in this process, and the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark → pion production mechanisms. The x, z and P 2 t dependences of several ratios (the ratios of favored-unfavored fragmentation functions, charged pion ratios, deuteron-hydrogen and aluminum-deuteron ratios for π + and π − ) have been studied. The ratios are found to be in good agreement with expectations based upon a high-energy quark-parton model description. We find the azimuthal dependences to be small, as compared to exclusive pion electroproduction, and consistent with theoretical expectations based on tree-level factorization in terms of transverse-momentum-dependent parton distribution and fragmentation functions. In the context of a simple model, the initial transverse momenta of d quarks are found to be slightly smaller than for u quarks, while the transverse momentum width of the favored fragmentation function is about the same as for the unfavored one, and both fragmentation widths are larger than the quark widths.

show abstract

Hadron production bye+e−annihilation at center-of-mass energies between 2.6 and 7.8 GeV. II. Jet structure and related inclusive distributions

Cited by 24 publications

References 49 publications

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Hydrodynamic approaches in relativistic heavy ion reactions

Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Contact Info

Product

Resources

About

Hadron production bye+e−annihilation at center-of-mass energies between 2.6 and 7.8 GeV. II. Jet structure and related inclusive distributions

Cited by 24 publications

References 49 publications

Tests of quantum chromo dynamics at e+e− colliders

Tests of quantum chromo dynamics at e+e− colliders

Hydrodynamic approaches in relativistic heavy ion reactions

Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Contact Info

Product

Resources

About

Tests of quantum chromo dynamics at e⁺e⁻ colliders

Tests of quantum chromo dynamics at e⁺e⁻ colliders