Maximum particle densities in rapidity space of π+ p, K+ p and pp collisions at 250 GeV/c

Adamus, M.; Ajinenko, I.; Amato, S.; Belokopytov, Yu.; Berezhnoy, V. A.; Białkowska, H.; Böttcher, H.; Chliapnikov, P.; Crijns, F.; Roeck, A. De; Wolf, E. A. De; Endler, A. M. F.; Gevorkyan, G. V.; Grässler, H.; Grigoryan, N.; Hakobyan, R.; Hal, P. van; Haupt, T.; Kisielewska, D.; Kittel, W.; Kniazev, V. V.; Kurnosenko, A. I.; Meijers, F.; Michałowska, A. B.; Nikolaenko, V.; Oliveira, Lincoln Carlos Silva de; Olkiewicz, K.; Petrovykh, L.P.; Riipinen, E.; Roloff, H. E.; Ronjin, V. M.; Rybin, A. M.; Saarikko, H.; Saarikko, Y. T. M.; Schmitz, W.; Scholten, L.; Shabalina, E.; Steṕaniak, J.; Tchikilev, O.; Uvarov, V.; Verbeure, F.; Wischnewski, R.; Zotkin, S. A.

doi:10.1016/0370-2693(87)91554-1

Cited by 127 publications

(16 citation statements)

References 2 publications

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“…The interest in this study was first stimulated by the experimental finding in 1983 of unexpectedly large local fluctuations (2 times the average) in a high multiplicity event from JACEE [3]. The same phenomena were observed latter also in accelerator experiments, the local fluctuations being as large as 60 times the average [4]. Such large fluctuations may not be simply due to statistical reason and is an indication of the existence of non-statistical (dynamical) fluctuations.…”

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confidence: 80%

Qualitative difference between the dynamics of particle production in soft and hard processes of high energy collisions

Liu

Lianshou

1999

Phys. Rev. D

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The qualitative difference between the anomalous scaling properties of hadronic final states in soft and hard processes of high energy collisions is studied in some detail. It is pointed out that the experimental data of e + e − collisions at E cm =91.2 GeV from DELPHI indicate that the dynamical fluctuations in e + e − collisions are isotropical, in contrast to the anisotropical fluctuations oberserved in hadronhadron collision experiments. This assertion is confirmed by the Monte Carlo simulation using the Jetset7.4 event generator.PACS number: 13.85 Hd Keywords: Multiparticle production, Hard and soft processes, Dynamic fluctuations, Self-affine fractal Quantum Chromodynamics (QCD) [1] as a candidate of the basic theory of strong interaction has been very successful in the study of hard processes, such as scaling violation in deep inelastic scattering (DIS), hadronic-jet production in e + e − annihilation, large-p t -jet production in hadron-hadron collisions etc.. In such processes there exist large scales so that QCD can be solved perturbatively due to asymptotic freedom.On the contrary, in soft-hadronic processes, e.g. hadron-hadron, hadron-nucleus and nucleus-nucleus collisions below CERN collider energies, there is no large scale present, and the interaction becomes so strong that pQCD is no longer applicable. In these cases, the problem is hard to be solved analytically from the first principle and phenomenological regularities extracted from experiments have to be ultilized to increase our knowledge on the property of the basic dynamics in such processes.In this respect, a comparison of the phenomenology of multiparticle final states in soft and hard processes is worthwhile. Such comparison is helpful in getting information about the similarity and distinction between the dynamics of particle production in these two kinds of processes. In particular, to find out the qualitative differences, if any, between them is especially interesting.In this paper we will show that such a qualitative difference does exist in the anomalous scaling property of final-state particle distribution. It turns out that the higher-dimensional factorial moments (FM) do have anomalous scaling property (obey a power law with the diminishing of phase space) when and only when the partition of phase space is anisotropic for soft processes while isotropic for hard ones. This means that the dynamical fluctuations are anisotropic in the former case while isotropic in the latter. This qualitative distinction may serve as a useful criterion in the study of the basic dynamics of particle production in these two kinds of processes.Let us first review briefly the status of dynamical-fluctuation study in high energy collisions [2]. The interest in this study was first stimulated by the experimental finding in 1983 of unexpectedly large local fluctuations (2 times the average) in a high multiplicity event from JACEE [3]. The same phenomena were observed latter also in accelerator experiments, the local fluctuations being as large as...

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confidence: 80%

Qualitative difference between the dynamics of particle production in soft and hard processes of high energy collisions

Liu

Lianshou

1999

Phys. Rev. D

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“…Such large local fluctuations have been observed in a cosmic-ray event [1] and in high-energy collision experiments [2,3,4]. Theoretically, the QCD branching cascade [5] involving channels q → qg, g → gg and g → qq, like other branching processes [6], leads to fractal behavior [7] which manifests itself in the form of power law scaling of final-state multiplicity fluctuations with an increasing resolution in phase space.…”

Section: Introductionmentioning

confidence: 99%

Scaling properties of multiplicity fluctuations in heavy-ion collisions simulated by AMPT model

et al. 2013

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Three dimensional, as well as one-and two-dimensional, studies of multiplicity fluctuation are performed using AMPT model to generate central Au-Au collision events at √ sNN = 200 GeV. Two-and three-dimensional normalized factorial moments in rapidity, transverse momentum and azimuthal angle are found to exhibit power-low scaling when partitioning with the same number of bins in each direction, indicating that the fluctuation are isotropic, i.e the fractality is self-similar in multiparticle production of central Au-Au collisions. Further, we measured the parameter ν which it characterizes the intermittency indices derived in particular analysis. It is found that our model result νyϕp t = 1.86 ± 0.07 is larger than ν = 1.304, which is the value of Ginzburg-Landau type of phase transition. We also explored the intermittent or fluctuational dependence on the transverse momentum. The result shows that the intermittency or fluctuation increase rapidly with the increasing of transverse momentum.

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“…The observation of the spike events first noticed inside the cosmic ray interaction [16] and later in the laboratory [17][18][19] have lead to great spurt of interest in learning about intermittency behaviour in high-energy collisions. Bialas and Peschanski [3,20] have done groundbreaking work in this discipline by theoretically formulating the features of intermittency in the field of particle physics.…”

Section: Methodsmentioning

confidence: 99%

Intermittency Study of Charged Particles Generated in Pb-Pb Collisions at sNN=2.76 TeV Using EPOS3

Gupta

Malik

2020

Advances in High Energy Physics

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Charged particle multiplicity fluctuations in Pb-Pb collisions are studied for the events generated using EPOS3 (hydro and hydro+cascade) at √ sNN = 2.76 TeV. Normalized factorial moments (Fq) have been determined in the strict sense of intermittency being a power-law behaviour of Fq with decreasing bin size. There is no significant scaling behaviour in these moments with the decreasing bin size or of Fq with second order normalized factorial moments, F2. The values of scaling exponent, ν deduced for a few pT bins is greater than that of the value for the second order phase-transition predicted by Ginzburg-Landau theory. The link in the notions of fractality is also studied. Fractal dimensions, Dq decrease with the order of the moment q which indicates the existence of multifractal nature of the studied events.

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Maximum particle densities in rapidity space of π+ p, K+ p and pp collisions at 250 GeV/c

Cited by 127 publications

References 2 publications

Qualitative difference between the dynamics of particle production in soft and hard processes of high energy collisions

Qualitative difference between the dynamics of particle production in soft and hard processes of high energy collisions

Scaling properties of multiplicity fluctuations in heavy-ion collisions simulated by AMPT model

Intermittency Study of Charged Particles Generated in Pb-Pb Collisions at sNN=2.76 TeV Using EPOS3

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