Unified QCD description of hadron and jet multiplicities

Lupia, S.; Ochs, Wolfgang

doi:10.1016/s0370-2693(97)01388-9

Cited by 42 publications

(112 citation statements)

References 34 publications

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“…The theoretical predictions [70] agree quantitatively with experimental findings [147,148] at the lowest resolution, where this ratio is equal to 3/2, and only qualitatively at higher resolutions. The computer calculations [73,74] agree quite well with experiment for different resolution parameters that implies the importance of the precise account for the energy-momentum conservation. Subjet multiplicities have also been studied for the separated quark and gluon jets.…”

Section: Subjet Multiplicitiessupporting

confidence: 59%

Multiparticle production and quantum chromodynamics

Dremin

2002

Phys.-Usp.

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The theory of strong interactions, quantum chromodynamics (QCD), is quite successful in the prediction and description of main features of multiparticle production processes at high energies. The general perturbative QCD approach to these processes (mainly to e + e − -annihilation) is briefly formulated and its problems are discussed. It is shown that the analytical calculations at the parton level with the low-momentum cut-off reproduce experimental data on the hadronic final state in multiparticle production processes at high energies surprisingly accurately even though the perturbative expansion parameter is not very small. Moreover, it is important that the perturbative QCD has been able not only to describe the existing data but also to predict many bright qualitatively new phenomena.

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Section: Subjet Multiplicitiessupporting

confidence: 59%

Multiparticle production and quantum chromodynamics

Dremin

2002

Phys.-Usp.

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“…Therefore and in general, MLLA and NMLLA corrections for the less inclusive multiplicity correlator of any rank k are more sizable than those of the more inclusive average multiplicity. That is the reason for, the exact numerical solution of the evolution equations [7,29] becomes interesting.…”

Section: Medium-modified G 2 At Nmlla and Expansion Inmentioning

confidence: 99%

Medium-modified evolution of multiparticle production in jets in heavy-ion collisions

Pérez-Ramos¹

2009

J. Phys. G: Nucl. Part. Phys.

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Abstract:The energy evolution of medium-modified average multiplicities and multiplicity fluctuations in quark and gluon jets produced in heavy-ion collisions is investigated from a toy QCD-inspired model. In this model, we use modified splitting functions accounting for medium-enhanced radiation of gluons by a fast parton which propagates through the quark gluon plasma. The leading contribution of the standard production of soft hadrons is found to be enhanced by the factor √ N s while next-to-leading order (NLO) corrections are suppressed by 1/ √ N s , where the nuclear parameter N s > 1 accounts for the induced-soft gluons in the hot medium. The role of next-to-next-to-leading order corrections (NNLO) is studied and the large amount of medium-induced soft gluons is found to drastically affect the convergence of the perturbative series. Our results for such global observables are cross-checked and compared with their limits in the vacuum and a new method for solving the second multiplicity correlator evolution equations is proposed.

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“…The numerical solution of the MLLA evolution equation for the particle multiplicity generated by light quarks, supplemented by the full O(α s ) effects for e + e − annihilation [76], gives N ch had (8.0 GeV) = 6.5. In this fit no effort was undertaken to separate the contributions from different flavours, so the fit which includes low energy data as well should be placed in between N ch had and N ch qq , to be compared with (22) and (25).…”

Section: Test Of Mlla Predictions For B Quark Jetsmentioning

confidence: 99%

Multiplicity Difference between Heavy and Light Quark Jets Revisited

Fabbri¹

2006

AIP Conference Proceedings

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The perturbative QCD approach to multiparticle production predicts a characteristic suppression of particle multiplicity in a heavy quark jet as compared to a light quark jet. In the Modified Leading Logarithmic Approximation (MLLA) the multiplicity difference δ Qℓ between heavy and light quark jets is derived in terms of a few other experimentally measured quantities. The earlier prediction for b-quarks needs revision in the light of new experimental results and the improvement in the understanding of the experimental data. We now find δ bℓ = 4.4 ± 0.4. The updated MLLA results on δ bℓ and δ cℓ are compared with the present data from e + e − annihilation. Their expected energy independence is confirmed within the energy range between 29 and 200 GeV; the absolute values are now in better agreement with experiment than in the previous analysis, and the remaining difference can be attributed largely to next-to-MLLA contributions, an important subset of which are identified and evaluated.

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Unified QCD description of hadron and jet multiplicities

Cited by 42 publications

References 34 publications

Multiparticle production and quantum chromodynamics

Multiparticle production and quantum chromodynamics

Medium-modified evolution of multiparticle production in jets in heavy-ion collisions

Multiplicity Difference between Heavy and Light Quark Jets Revisited

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