Multiparticle production and quantum chromodynamics

Dremin, I. M.

doi:10.1070/pu2002v045n05abeh001088

Cited by 12 publications

(5 citation statements)

References 148 publications

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“…According to (77), (78) the evolution from W τ [ρ] to W τ +∆τ [ρ] is generated by changes in the source ρ in the rapidity interval (τ, τ + ∆τ ), in which the quantum corrections in the considered LLA approximation are essential 8 . Note that the coordinate support of the source is correlated with longitudinal momenta of the modes that are integrated over.…”

Section: Nonlinear Evolution Equation: Derivationmentioning

confidence: 99%

“…The evolution (81) includes new virtual and real kernels ν and η. Explicit computations [32,33] lead to the following simple expressions for them: 8 For explicit discussion see also [37].…”

Section: Nonlinear Evolution Equation: α -Representationmentioning

confidence: 99%

“…Let us also stress that many aspects of multiparticle production are universal, so comparison with the results for e + − e − annihilation [6,7,8] or hadron collisions [9] is interesting and relevant. What is specific of nuclear collisions is a very large density of primordial gluonic modes due to A-dependent amplification of the universal perturbative high-energy (small x) growth of the gluon density.…”

Section: Introductionmentioning

confidence: 99%

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Dense gluon matter in nuclear collisions

Leonidov¹

2005

Usp. Fiz. Nauk

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Section: Nonlinear Evolution Equation: Derivationmentioning

confidence: 99%

Section: Nonlinear Evolution Equation: α -Representationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dense gluon matter in nuclear collisions

Leonidov¹

2005

Usp. Fiz. Nauk

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“…Indeed, as it was shown in [4,25], the "−"-component contribution gives the natural explanation of the longstanding discrepancy in the theoretical description of the data, which reviewed, for example, in Ref. [26]. It is also in full agreement with the study [27] of low x asymptotics of parton densities, where the existence of the corresponding "−"-component leads to a good agreement between theoretical studies [28] and the experimental data [29] for the structure function F 2 (x, Q 2 ) of the deep-inelastic scattering obtained by H1 and ZEUS Collaborations.…”

mentioning

confidence: 91%

SUSY, Casimir scaling and probabilistic properties of gluon and quark jets evolution

Kotikov,

Teryaev

2020

Preprint

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We study the new relation [1] between the anomalous dimensions, resummed through next-to-next-to-leading-logarithmic order, in the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution equations for the first Mellin moments D q,g (µ 2 ) of the fragmentation functions, which correspond to the average multiplicities of hadrons in jets initiated by quarks and gluons, respectively. This relation is shown to lead to probabilistic properties of the properly rescaled parton jet multiplicities obtained from standard ones by extracting the quark and gluon "color charges" C F and C A , respectively.

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“…To shorten the presentation, only some of most impressive results have been chosen and no Figures are presented. More complete list with a detailed survey and Figures demonstrating comparison with experiment can be found in the books [1, 2]and in recent review papers [3,4,5,6,7].…”

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confidence: 99%

QCD Physics at Lep

Dremin

2003

Multiparticle Dynamics

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With the advent of LEP we discovered jets and at its last years we learned a lot about intermediate vector bosons. All that strongly supports our belief in QCD. Jet physics is briefly described in this talk. Experimental results are compared with QCD predictions. It is shown that the perturbative QCD has been able not only to describe the existing data but also to predict many bright phenomena.The main process of e + e − -annihilation at LEP looks like two jets moving in the opposite directions. These jets are considered in QCD as (initiated by quarks and collimated) cascades of consecutive emissions of partons each of which produces observed hadrons due to soft confinement. Early days.Jets were discovered in 1975. Their angular collimation was demonstrated in studies of such kinematical properties as sphericity, spherocity, thrust etc. They show that the transverse momenta are small compared to the total momenta if the proper coordinate axes are chosen. The collimation increases with energy increase.The jet axes were defined from these characteristics. It has been shown that the angular (θ) distribution of jet axes in e + e − -annihilation follows the dependence ∝ (1 + cos 2 θ) expected for spin 1/2 objects.The quark origin of jets was proven in studies of the ratio of e + e − -annihilation cross sections to hadrons and to µ + µ − -pairs. QCD predicts that this ratio should be equal to the sum of squared charges of the objects initiating jets. In experiment, this ratio equals just its value for quarks and increases with energy at the thresholds for heavier quarks.Thus, these early findings assured us that QCD is on the right way. Later, numerous data supported this conclusion as is shown in what follows in brief. To shorten the presentation, only some of most impressive results have been chosen and no Figures are presented. More complete list with a detailed survey and Figures demonstrating comparison with experiment can be found in the books [1,2] and in recent review papers [3,4,5,6,7]. Theory.According to QCD, the primary quarks emit gluons which, in their turn, can emit e + e − -pairs and gluons. Thus the branching process of jet evolution appears. The gluons with high enough transverse momenta can create gluon jets. QCD pretends to describe jets of both quark and gluon origin. Many hadrons are created when partons become confined.

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Multiparticle production and quantum chromodynamics

Cited by 12 publications

References 148 publications

Dense gluon matter in nuclear collisions

Dense gluon matter in nuclear collisions

SUSY, Casimir scaling and probabilistic properties of gluon and quark jets evolution

QCD Physics at Lep

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