Scaling violation favouring high multiplicity events at 540 GeV CMS energy

Alner, G. J.; Alpgård, K.; Ansorge, R. E.; Åsman, B.; Böckmann, K.; Booth, C. N.; Burow, L.; Carlson, P.; Chevalley, J.L.; Clercq, C. De; DeWolf, R. S.; Eckart, B.; Ekspong, G.; Evangelou, I.; Eyring, A.; Fabre, J.; French, K. A.; Gaudaen, J.; Geich-Gimbel, Ch.; Gijsen, M.; Holt, K.; Hospes, R.; Johnson, D.P.; Jon‐And, K.; Kokott, T. P.; Mackenzi, R.; Maggs, M. N.; Meinke, R.; Müller, Th.; Munday, D. J.; Ovens, J. E. V.; Rushbrooke, J. G.; Saarikko, H.; Saarikko, T.; Triantis, F. A.; Walck, C.; Ward, C. P.; Ward, D. R.; White, T. O.; Wilquet, G.; Yamdagni, N.

doi:10.1016/0370-2693(84)91666-6

Cited by 171 publications

(34 citation statements)

References 27 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 the default version of the MI model in pythia 5.7 a sharp cutoff p min ⊥ = 1.4 GeV is used, although more complicated alternatives are available as options [15]. Using this MI model, data on multiplicities, rapidity distributions and pedestal effects at the SppS ( √ s = 540 and 630 GeV) [38] can be reasonably described [37]. Measurements of this kind have only recently been made at the Tevatron and the model has not yet been tested or tuned at the energy of interest in our study.…”

Section: Remnants and Soft Underlying Eventmentioning

confidence: 99%

Soft color interactions and diffractive hard scattering at the Fermilab Tevatron

2001

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An improved understanding of nonperturbative QCD can be obtained by the recently developed soft color interaction models. Their essence is the variation of color string-field topologies, giving a unified description of final states in high energy interactions, e.g., diffractive and nondiffractive events in ep and pp. Here we present a detailed study of such models (the soft color interaction model and the generalized area law model) applied to pp, considering also the general problem of the underlying event including beam particle remnants. With models tuned to HERA ep data, we find a good description also of Tevatron data on production of W, beauty and jets in diffractive events defined either by leading antiprotons or by one or two rapidity gaps in the forward or backward regions. We also give predictions for diffractive J/ψ production where the soft exchange mechanism produces both a gap and a color singlet cc state in the same event. This soft color interaction approach is also compared with Pomeron-based models for diffraction, and some possibilities to experimentally discriminate between these different approaches are discussed.12.38.Lg, 12.38.Aw

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“…However, in limited central η-intervals scaling has been found to hold up to 900 GeV. The UA5 collaboration [16] observed scaling for non-single-diffractive events in restricted central η-intervals and its progressive violation with increasing η-ranges. The UA1 collaboration [17] also observed scaling in a larger interval |η| < 2.5.…”

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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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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Scaling violation favouring high multiplicity events at 540 GeV CMS energy

Cited by 171 publications

References 27 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

Soft color interactions and diffractive hard scattering at the Fermilab Tevatron

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

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