Negative binomial multiplicity distributions in high energy hadron collisions

Giovannini, Alberto; Hove, Leo Van

doi:10.1007/bf01557602

Cited by 274 publications

(170 citation statements)

References 14 publications

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“…It is instructive for the further discussion to consider the clan model [53], which is the standard physical explanation of the NBD distribution in the context of particle production in pp collisions. In this model particle sources, called ancestors, are produced independently according to a Poisson distribution with mean value, N = k ln (1 + μ/k).…”

Section: A Multiplicity Biasmentioning

confidence: 99%

Centrality dependence of particle production inp−Pbcollisions atsNN=5.02TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2015

Phys. Rev. C

179

185

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We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p-Pb collisions at √ s NN = 5.02 TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (N part ) or the number of nucleon-nucleon binary collisions (N coll ) are described. We show that, in contrast to Pb-Pb collisions, in p-Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the N part dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-p T the p-Pb spectra are found to be consistent with the pp spectra scaled by N coll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p-Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data.

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Section: A Multiplicity Biasmentioning

confidence: 99%

Centrality dependence of particle production inp−Pbcollisions atsNN=5.02TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2015

Phys. Rev. C

179

185

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show abstract

“…Following a simple participant model [5,15,16,26,27], the particle multiplicity (of photons or charged particles), N , may be expressed as :…”

Section: Estimation Of Fluctuations In a Participant Modelmentioning

confidence: 99%

Event-by-event fluctuations in particle multiplicities and transverse energy produced in158A GeVPb+Pb collisions

Aggarwal¹,

Ahammed²,

Angelis³

et al. 2002

Phys. Rev. C

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Event-by-event fluctuations in the multiplicities of charged particles and photons, and the total transverse energy in 158·A GeV Pb+Pb collisions are studied for a wide range of centralities. For narrow centrality bins the multiplicity and transverse energy distributions are found to be near perfect Gaussians. The effect of detector acceptance on the multiplicity fluctuations has been studied and demonstrated to follow statistical considerations. The centrality dependence of the charged particle multiplicity fluctuations in the measured data has been found to agree reasonably well with those obtained from a participant model. However, for photons the multiplicity fluctuations have been found to be lower compared to those obtained from a participant model. The multiplicity and transverse energy fluctuations have also been compared to those obtained from the VENUS event generator.

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“…(6) which describes the multiplicity distributions up to √s = 540 GeV, announced by UA5 (Giovannini and Van-Hove, 1986). The NBD is defined by two parameters and k.…”

Section: Particle Creation Between Theory and Experimentsmentioning

confidence: 99%

Particle production in proton-proton collisions

Ghoneim¹,

Sawy²,

Hussein³

2015

Int. J. Phys. Sci.

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Proton-proton collision is a simple system to investigate nuclear matter and it is considered to be a guide for more sophisticated processes in the proton-nucleus and the nucleus-nucleus collisions. In this article, the authors present a phenomological study of how the mechanism of particle production in pp interaction changes over a wide range of interaction energy. This study is done on data of charged particle produced in pp experiments at different values of energy. Some of these data give the created particles classified as hadrons, baryons and mesons, which help us compare between production of different particles. This might probe some changes in the state of nuclear matter and identify the mechanism of interaction.

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Negative binomial multiplicity distributions in high energy hadron collisions

Cited by 274 publications

References 14 publications

Centrality dependence of particle production inp−Pbcollisions atsNN=5.02TeV

Centrality dependence of particle production inp−Pbcollisions atsNN=5.02TeV

Event-by-event fluctuations in particle multiplicities and transverse energy produced in158A GeVPb+Pb collisions

Particle production in proton-proton collisions

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