Scaling violations in multiplicity distributions at 200 and 900 GeV

Alner, G. J.; Ansorge, R. E.; Åsman, B.; Böckmann, K.; Booth, C. N.; Burow, L.; Carlson, P.; Clercq, C. De; DeWolf, R. S.; Eckart, B.; Ekspong, G.; Evangelou, I.; Eyring, A.; Fabre, J.; Fröbel, L.; Fuglesang, C.; Gaudaen, J.; Geich-Gimbel, Ch.; Holtey, G. von; Hospes, R.; Jon‐And, K.; Kokott, T. P.; Lotse, F.; Manthos, N.; Meinke, R.; Munday, D. J.; Ovens, J. E. V.; Pelzer, W.; Reidy, J. J.; Rushbrooke, J. G.; Schmickler, H.; Triantis, F. A.; Hamme, L. Van; Walck, C.; Ward, C. P.; Ward, D. R.; Webber, C. J. S.; White, T. O.; Wilquet, G.; Yamdagni, N.

doi:10.1016/0370-2693(86)91304-3

Cited by 174 publications

(30 citation statements)

References 17 publications

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“…The errors presented are both statistical, for which a resampling technique was used, and sytematics, composed of the uncertainty in using Monte Carlo for modeling single-diffractive events, the uncertainty on tracking and acceptance efficiency, the model dependence of the response matrix used in the unfolding, and lastly the uncertainty of the trigger and event selection efficiency. The measurements agree well with the ones of UA5 [6,7] and ALICE [8]. In Fig.…”

Section: Resultssupporting

confidence: 80%

Charged particle multiplicities at \sqrt s = 0.9, 2.36 and 7.0 TeV with the CMS detector at LHC

Rougny¹

2011

Proceedings of 35th International Conference of High Energy Physics — PoS(ICHEP 2010)

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Measurements of primary charged hadron multiplicity distributions are presented for non-singlediffractive events in proton-proton collisions at centre-of-mass energies of √ s = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from |η| < 0.5 to |η| < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at √ s = 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with √ s is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution confirms the violation of the Koba-Nielsen-Olesen scaling that has been observed at lower energies.

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Section: Resultssupporting

confidence: 80%

Charged particle multiplicities at \sqrt s = 0.9, 2.36 and 7.0 TeV with the CMS detector at LHC

Rougny¹

2011

Proceedings of 35th International Conference of High Energy Physics — PoS(ICHEP 2010)

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“…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]. However, in limited central η-intervals scaling has been found to hold up to 900 GeV.…”

Section: Introductionmentioning

confidence: 96%

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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“…As expected from Feynman scaling [1], at low centre-of-mass energies ( √ s), where particle production is dominated by soft interactions, the mean number of particles M was found to rise logarithmically with √ s. Moreover, the evolution of the charged particle multiplicity distribution P (M ) as a function of √ s follows the Koba-Nielsen-Oleson (KNO) scaling [2] with scaling variable z = M/ M and P (M ) M = ψ(z), where ψ(z) is an energy independent function. Experimentally one finds that KNO scaling is violated for √ s > 200 GeV [3]. This scaling violation which increases with √ s has been interpreted as a consequence of particle production through multiple parton-parton interactions (MPI) [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Multiplicity dependence of two-particle azimuthal correlations in pp collisions at the LHC

Abelev

Adam

Adamová

et al. 2013

J. High Energ. Phys.

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We present the measurements of particle pair yields per trigger particle obtained from di-hadron azimuthal correlations in pp collisions at √ s = 0.9, 2.76, and 7 TeV recorded with the ALICE detector. The yields are studied as a function of the charged particle multiplicity. Taken together with the single particle yields the pair yields provide information about parton fragmentation at low transverse momenta, as well as on the contribution of multiple parton interactions to particle production. Data are compared to calculations using the PYTHIA6, PYTHIA8, and PHOJET event generators.

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Scaling violations in multiplicity distributions at 200 and 900 GeV

Cited by 174 publications

References 17 publications

Charged particle multiplicities at \sqrt s = 0.9, 2.36 and 7.0 TeV with the CMS detector at LHC

Charged particle multiplicities at \sqrt s = 0.9, 2.36 and 7.0 TeV with the CMS detector at LHC

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

Multiplicity dependence of two-particle azimuthal correlations in pp collisions at the LHC

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