KNO scaling 30 years later

Hegyi, S.

doi:10.1016/s0920-5632(00)01026-4

Cited by 23 publications

(19 citation statements)

References 23 publications

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“…Although the error bars at high multiplicities are large, there is an indication of a mild deviation from the KNO scaling, similar to what has been observed for charged particles at mid-rapidity [1]. Violations of KNO scaling for charged particle multiplicities had been observed earlier for pp and pp collisions at √ s = 30 GeV to 1800 GeV at the Fermilab Tevatron and also in UA5 experiment at CERN at 546 GeV [29][30][31]. The present observation at the LHC energies is consistent with these findings.…”

Section: Multiplicity Distributionssupporting

confidence: 70%

Inclusive photon production at forward rapidities in proton–proton collisions at $$\mathbf {\sqrt{s}}$$ s = 0.9, 2.76 and 7 TeV

Abelev¹,

Adam²,

Adamová³

et al. 2015

Eur. Phys. J. C

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The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < η < 3.9) in proton-proton collisions at three center-of-mass energies, √ s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2 ± 0.3 % (stat) ± 8.8 % (sys) and 61.2 ± 0.3 % (stat) ± 7.6 % (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.

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Section: Multiplicity Distributionssupporting

confidence: 70%

Inclusive photon production at forward rapidities in proton–proton collisions at $$\mathbf {\sqrt{s}}$$ s = 0.9, 2.76 and 7 TeV

Abelev¹,

Adam²,

Adamová³

et al. 2015

Eur. Phys. J. C

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“…with n being the average multiplicity. This means that the rescaled data points P (n) measured at different energies collapse onto the unique curve Ψ [34]. An analysis of the multiplicity distributions of pp and pp data from √ s = 23.6 GeV to √ s = 1.8 TeV shows that the KNO scaling does not hold except for very central and small regions of phase space [35].…”

Section: Resultsmentioning

confidence: 99%

Universality of the underlying event in pp collisions

Velasquez

Palomo

2017

Phys. Rev. D

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In this paper we study ATLAS results on underlying event in pp collisions at √ s = 0.9, 7 and 13 TeV. We show that the center-of-mass energy dependences of the charged-particle production sensitive to the underlying event ("transverse" region) and to the hardest partonic interaction ("towards" and "away" regions) in pp collisions can be both understood in terms of the change of the inclusive average multiplicity. Within uncertainties, the corresponding particle production as a function of the leading charged particle shows no significant √ sdependence for the three regions once they are scaled according to the relative change in multiplicity. The scaling properties reported here are well reproduced by PYTHIA 8.212 tune Monash 2013 and suggest an universality of the underlying event in hadronic interactions at high √ s. Based on the simulations, we observed that the same scaling properties are also present in the average number of multi-partonic interactions as a function of the leading charged particle. Moreover, the multiplicity distributions associated to the underlying event exhibit a KNO scaling.

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“…20,21 In this framework, one studies the KNO function Ψ(z) = n P n , where z = n n . Figure 1 reports the CMS multiplicity distributions in KNO form for a large pseudorapidity interval of |η| < 2.4, where a strong violation of KNO scaling between √ s = 0.9 TeV and 7 TeV is observed, and for a small pseudorapidity interval of |η| < 0.5 where the KNO scaling is found to hold.…”

Section: Measurements Of Particle Yields and Kinematic Distributionsmentioning

confidence: 99%

Multi-Particle Production of Hadrons

Bartalini

2013

Mod. Phys. Lett. A

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The phenomenology of multi-particle production of hadrons is reviewed, with emphasis on the results at the Large Hadron Collider (LHC): the first part of the review focuses on the basic kinematic measurements of charged tracks and identified hadrons in minimum bias interactions; the second part reports the short-and long-range correlation studies; the third part concentrates on the underlying event phenomenology in different final states; the fourth part, which constitutes a bottom line on the phenomenology of multiple parton interactions, considers the consequences of multiple hard-scatterings in a single hadron-hadron collisions. Some relevant highlights from the heavy ion program are also discussed.

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KNO scaling 30 years later

Cited by 23 publications

References 23 publications

Inclusive photon production at forward rapidities in proton–proton collisions at $$\mathbf {\sqrt{s}}$$ s = 0.9, 2.76 and 7 TeV

Inclusive photon production at forward rapidities in proton–proton collisions at $$\mathbf {\sqrt{s}}$$ s = 0.9, 2.76 and 7 TeV

Universality of the underlying event in pp collisions

Multi-Particle Production of Hadrons

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