Charged multiplicity distribution in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pp</mml:mi></mml:math>interactions at CERN ISR energies

Breakstone, A.; Campanini, R.; Crawley, H. B.; Dallavalle, G. M.; Deninno, M.; Doroba, K.; Drijard, D.; Fabbri, F.; Faessler, M.; Firestone, A.; Fischer, H. G.; Frehse, H.; Geist, W.; Giacomelli, G.; Gokieli, R.; Gorbics, M.; Gruhn, C.R.; Hanke, P.; Heiden, M.; Herr, W.; Innocenti, P. G.; Kluge, E. E.; Lämsä, J.; Löhse, T.; Meyer, W. T.; Mornacchi, G.; Nakada, T.; Panter, M.; Putzer, A.; Rauschnabel, K.; Rensch, B.; Rimondi, F.; Sosnowski, R.; Stenlund, E.; Symons, T. J. M.; Szczekowski, M.; Szwed, R.; Ullaland, O.; Wegener, D.; Wunsch, M.

doi:10.1103/physrevd.30.528

Cited by 147 publications

(68 citation statements)

References 26 publications

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“…The UA1 collaboration [17] also observed scaling in a larger interval |η| < 2.5. In inelastic events, deviation from KNO scaling was observed in full phase space already at ISR energies [14]. Such deviations are generally attributed to semihard gluon radiation (minijets) and to multi-parton scattering.…”

Section: Introductionmentioning

confidence: 99%

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Charged-particle multiplicity measurement in proton–proton collisions at $\sqrt{s}=0.9$ and 2.36 TeV with ALICE at LHC

et al. 2010

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Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range |η| < 1.4. In the central region (|η| < 0.5), at 0.9 TeV, we measure charged-particle pseudo- for non-single-diffractive collisions. The relative increase in charged-particle multiplicity from the lower to higher energy is 24.7% ± 0.5%(stat.) +5.7 −2.8 %(syst.) for inelastic and 23.7% ± 0.5%(stat.) +4.6 −1.1 %(syst.) for non-single-diffractive interactions. This increase is consistent with that reported by the CMS collaboration for non-single-diffractive events and larger than that found by a number of commonly used models. The multiplicity distribution was measured in different pseudorapidity intervals and studied in terms of KNO variables at both energies. The results are compared to protonantiproton data and to model predictions.

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Section: Introductionmentioning

confidence: 99%

“…KNO scaling means that the distribution N ch P (z), where z = N ch / N ch , is independent of energy. In full phase space, scaling holds up to the top ISR energy (pp at √ s = 62.2 GeV) [14]. Deviations from scaling are observed at higher energies, starting at 200 GeV with pp collisions at the SppS collider [15].…”

Section: Introductionmentioning

confidence: 99%

Charged-particle multiplicity measurement in proton–proton collisions at $\sqrt{s}=0.9$ and 2.36 TeV with ALICE at LHC

et al. 2010

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“…In particular, in the case of pp(p) collisions the charged particle multiplicity at a fixed centre-of-mass energy is observed to be systematically lower than what can be inferred from the e + e − data at the same √ s (see again Fig. 1, open symbols, data from [22,23,24,25,26]). As pointed out in [1], this behaviour can be understood after considering that, while in e + e − collisions the energy available for particle production coincides with the full centre-of-mass energy (once the effects from the initial state radiation are removed), in pp(p) collisions this energy is reduced with respect to √ s due to a basic feature of the hadronic interactions, the "leading effect".…”

Section: What We Learned From Previous Experimentsmentioning

confidence: 89%

Multiplicity studies and effective energy in ALICE at the LHC

et al. 2007

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Abstract. In this work we explore the possibility to perform "effective energy" studies in very high energy collisions at the CERN Large Hadron Collider (LHC). In particular, we focus on the possibility to measure in pp collisions the average charged multiplicity as a function of the effective energy with the ALICE experiment, using its capability to measure the energy of the leading baryons with the Zero Degree Calorimeters. Analyses of this kind have been done at lower centre-of-mass energies and have shown that, once the appropriate kinematic variables are chosen, particle production is characterized by universal properties: no matter the nature of the interacting particles, the final states have identical features. Assuming that this universality picture can be extended to ion-ion collisions, as suggested by recent results from RHIC experiments, a novel approach based on the scaling hypothesis for limiting fragmentation has been used to derive the expected charged event multiplicity in AA interactions at LHC. This leads to scenarios where the multiplicity is significantly lower compared to most of the predictions from the models currently used to describe high energy AA collisions. A mean charged multiplicity of about 1000 − 2000 per rapidity unit (at η ∼ 0) is expected for the most central P b − P b collisions at √ s N N = 5.5 TeV. PACS. PACS-key discribing text of that key -PACS-key discribing text of that key

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“…Thus an interaction radius can be related to the [15,19] experimentally measured p -p total inelastic scattering cross section. An experimental total inelastic cross section of 28 mb [25], gives a parton interaction radius of r g = 0.7 fm as pictured in Fig. 7.…”

Section: Quark and Gluon Interactions And P -P Collisionsmentioning

confidence: 99%

“…We find this to be true as depicted in in Figs. 9 and 10 where we show the experimental multiplicity [25] for p -p collisions at √ s = 30.4 and 60.2 GeV. We use protons that are composed of 42% gluonic strings for these calculations.…”

Section: Quark and Gluon Interactions And P -P Collisionsmentioning

confidence: 99%

Relativistic heavy-ion collisions in the dynamical string-parton model

et al. 2001

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We develop and extend the dynamical string parton model. This model, which is based on the salient features of QCD, uses classical Nambu-Gotō strings with the endpoints identified as partons, an invariant string breaking model of the hadronization process, and interactions described as quark-quark interactions. In this work, the original model is extended to include a phenomenological quantization of the mass of the strings, an analytical technique for treating the incident nucleons as a distribution of string configurations determined by the experimentally measured structure function, the inclusion of the gluonic content of the nucleon through the introduction of purely gluonic strings, and the use of a hard parton-parton interaction taken from perturbative QCD combined with a phenomenological soft interaction. The limited number of parameters in the model are adjusted to e + e − and p -p data. Utilizing these parameters, the first calculations of the model for p -A and A-A collisions are presented and found to be in reasonable agreement with a broad set of data. 25.75.+r, 12.38.Mh

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Charged multiplicity distribution inppinteractions at CERN ISR energies

Cited by 147 publications

References 26 publications

Charged-particle multiplicity measurement in proton–proton collisions at $\sqrt{s}=0.9$ and 2.36 TeV with ALICE at LHC

Charged-particle multiplicity measurement in proton–proton collisions at $\sqrt{s}=0.9$ and 2.36 TeV with ALICE at LHC

Multiplicity studies and effective energy in ALICE at the LHC

Relativistic heavy-ion collisions in the dynamical string-parton model

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