Comparative study of charged multiplicity distributions

Wolf, E. de; Dumont, J. J.; Verbeure, F.

doi:10.1016/0550-3213(75)90069-3

Cited by 41 publications

(12 citation statements)

References 32 publications

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“…The values obtained from Eq. (2) for the AA mean multiplicity are based on: nonsingle diffractivepp collisions at FNAL by the E735 experiment [7,24], at CERN by the UA5 experiment at √ spp = 546 GeV [25] and √ spp = 200 and 900 GeV [26]; pp collisions from CERN-ISR [27], and from the inelastic data from the bubble chamber experiments [28][29][30], the latter having been compiled and analyzed in [31]. The LHC multiplicities in pp interactions are calculated using the hybrid fit obtained here, Eq.…”

Section: The Participant Dissipating Energy Approachmentioning

confidence: 99%

“…energy dependence of the charged particle mean multiplicity in pp/pp collisions. The measurements are taken from: nonsingle diffractivepp collisions at FNAL by the E735 experiment[7,24], at CERN by the UA5 experiment at √ spp = 546 GeV[25] and √ spp = 200 and 900 GeV[26]; pp collisions from CERN-ISR[27], and from the inelastic data from the bubble chamber experiments[28][29][30][31]44].The solid line shows the hybrid fit, 1.60−0.03 ln(spp)+0.18 ln 2 (spp)+0.03 s 0.29 pp , the dotted line shows the power-law fit, −7.36+6.97 s 0.133 pp , and the dashed line shows the second-order log fit, 3.18−0.57 ln(spp)+0.216 ln 2 (spp). The open stars show the predictions by the PDE approach with the error bars of 5% uncertainty.…”

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confidence: 99%

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Multihadron production dynamics exploring the energy balance in hadronic and nuclear collisions

et al. 2016

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The relation of multihadron production in nucleus-nucleus and (anti)proton-proton collisions is studied by exploring the collision-energy and centrality dependencies of the charged particle mean multiplicity in the measurements to date. The study is performed in the framework of the recently proposed effectiveenergy approach which, under the proper scaling of the collision energy, combines the constituent quark picture with Landau relativistic hydrodynamics counting for the centrality-defined effective energy of participants. Within this approach, the multiplicity energy dependence and the pseudorapidity spectra from the most central nuclear collisions are well reproduced. The study of the multiplicity centrality dependence reveals a new scaling between the measured pseudorapidity spectra and the calculations. By means of this scaling, referred to as energy-balanced limiting fragmentation scaling, one reproduces the pseudorapidity spectra for all centralities. The scaling elucidates some differences in the multiplicity and midrapidity density centrality dependence obtained at RHIC and LHC. These findings reveal an inherent similarity in the multiplicity energy dependence from the most central collisions and centrality data. Predictions are made for the mean multiplicities to be measured in proton-proton and heavy-ion collisions at the LHC.

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Section: The Participant Dissipating Energy Approachmentioning

confidence: 99%

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confidence: 99%

Multihadron production dynamics exploring the energy balance in hadronic and nuclear collisions

et al. 2016

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“…[56,57], at CERN by UA5 Collab. at √ spp = 546 GeV [45] and √ spp = 200 and 900 GeV [58]; pp collisions at CERN-ISR [46], and the ALICE, CMS and CDF multiplicities, calculated using the E735 fit, 3.102 s 0.178 pp [57], and the data from bubble chamber experiments [50,59] the latter having been compiled and analysed in [60]. show, the process of bulk production is largely characterized by N part , or soft scaling, rather than by the number of binary collisions, N coll , the latter being attributed to hard scaling [10,23,34,35,51,52].…”

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Relating multihadron production in hadronic and nuclear collisions

2010

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The energy-dependence of charged particle mean multiplicity and pseudorapidity density at midrapidity measured in nucleus-nucleus and (anti)proton-proton collisions are studied in the entire available energy range. The study is performed using a model, which considers the multiparticle production process according to the dissipating energy of the participants and their types, namely a combination of the constituent quark picture together with Landau relativistic hydrodynamics. The model reveals interrelations between the variables under study measured in nucleusnucleus and nucleon-nucleon collisions. Measurements in nuclear reactions are shown to be well reproduced by the measurements in pp/pp interactions and the corresponding fits are presented. Different observations in other types of collisions are discussed in the framework of the proposed model. Predictions are made for measurements at the forthcoming LHC energies. 1.Soft hadron multiparticle production is one of the most intriguing topics in high-energy interaction studies. Data have been investigated in different types of interactions, ranging from lepton-lepton to nucleus-nucleus interactions, and over a large energy span, covering several orders of magnitude. QCD, the theory of strong interactions, has provided partonic description of many observations. However, the problem of soft multiparticle production still eludes a complete understanding and remains one of the challenging problems in high-energy physics [1]. The new high-energy data from LHC provide an opportunity to look at the system under new conditions. Of special interest are nucleusnucleus collisions, probing nuclear matter at extreme conditions, where new forms of matter are expected to be created a e-mail: sedward@mail.cern.ch b e-mail: Alexandre.Sakharov@cern.ch at very high densities and temperatures. The data available from RHIC experiments allow an interesting comparison of the particle production mechanisms with the less complex e + e − and pp systems. In this context, the global, or bulk, variables such as the average charged particle multiplicity and particle densities (spectra), which are the first available experimental observables, are of fundamental interest [1-3] as they are sensitive to the underlying interaction dynamics.In this paper we consider the center-of-mass (c.m.) energy dependence of the average multiplicity and near midrapidity density of charged hadrons produced in nucleusnucleus and (anti)proton-proton collisions. Whereas the multiplicity is sensitive mostly to the fraction of energy being transformed into observed particles in a given reaction, the midrapidity density reflects different stages of the reaction. Both variables increase with the collision c.m. energy. Recent measurements at RHIC follow the trends observed in e + e − and proton-proton interactions. The values of both bulk variables are found [4,5] to be similar when comparing the measurements in e + e − interactions at the c.m. energy of √ s ee , and in most central ("head-on") heavy-ion col...

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“…particle types, we give in fig. 3 only pp results refering to [22] for a comparative study of multiplicity distributions. The striking feature of onC is a broadening of the distribution with increasing energy.…”

Section: 5mentioning

confidence: 99%

A Jet Model Study of Correlations in Hadron‐Hadron Reactions Due to Resonance Production

Biebl¹,

Klein²,

Nahnhauer³

1980

Fortschr. Phys.

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Secondary particle correlations are discussed as a basic feature of hadron induced multiparticle reactions in the 5 to 1500 GeV energy range. Two introductory sections are devoted to definitions of cross sections and to empirical regularities of multiple production. Many of these regularities can be understood to be consequences of energy‐momentum conservation and limited transverse momenta (uncorrelated jet model (UJM)). An extension of the UJM is considered, the correlated jet model (CJM), by introducing dynamical short range correlations between the particles which are assumed to be due to resonance production. Many properties of single‐particle distributions and correlation functions can be derived already from kinematics of resonance decay. The CJM is used to investigate in detail the origin of angular correlations (azimuthal, GGLP‐effect) and of correlations between neutral and charged particles (〈π°〉nc, f00(nc)). These correlations are shown to arise almost completely from the production and decay of mainly two‐particle resonances like ∂°, K* and Δ, the main evidence coming from the use of the invariant mass as the basic variable where only resonances or reflections of them give remarkable effects. Compared to the UJM, the CJM is the first approximation of a successive correlations analysis of the production amplitude squared, i.e. having separated the effects of energy‐momentum and quantum number conservation. This might be also interesting in view of the forthcoming accelerator generation.

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Comparative study of charged multiplicity distributions

Cited by 41 publications

References 32 publications

Multihadron production dynamics exploring the energy balance in hadronic and nuclear collisions

Multihadron production dynamics exploring the energy balance in hadronic and nuclear collisions

Relating multihadron production in hadronic and nuclear collisions

A Jet Model Study of Correlations in Hadron‐Hadron Reactions Due to Resonance Production

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