Measurement of charged particle multiplicities and densities in pp collisions at √s = 7 TeV in the forward region

The paper is available here.

arXiv: 1402.4430 , LHCB-PAPER-2013-070, Eur. Phys. J. C (2014) 74:2888

More detailed informationLHCb-ANA-2011-084

Abstract

Charged particle multiplicities are studied in proton-proton collisions in the forward region at a centre-of-mass energy of sqrt(s) = 7 TeV with data collected in 2010 by the LHCb detector. The forward spectrometer allows access to a kinematic range of 2.0< η <4.8 in pseudorapidity, momenta down to 2 GeV/c and transverse momenta down to 0.2 GeV/c. The measurements are performed using minimum-bias events with at least one charged particle in the kinematic acceptance. The results are presented as functions of pseudorapidity and transverse momentum and are compared to predictions from several Monte Carlo event generators.

Figures

(Note, pdf and eps versions are available under attachments).

Caption Figure
Figure 1: Charged particle density as a function of η. The LHCb data are shown as points with statistical error bars (smaller than the marker size) and combined systematic and statistical uncertainties as the grey band. The measurement is compared to several Monte Carlo generator predictions, (a) Pythia 6 and Phojet, (b) Pythia 8 and Herwig++. Both plots show predictions of the LHCb tune of Pythia 6, which is used in the analysis. Fig_1a.pngFig_1b.png
Figure 2: Charged particle density as a function of pT . The LHCb data are shown as points with statistical error bars (smaller than the marker size) and combined systematic and statistical uncertainties as the grey band. The measurement is compared to several Monte Carlo generator predictions, (a) Pythia 6 and Phojet, (b) Pythia 8 and Herwig++. Both plots show predictions of the LHCb tune of Pythia 6, which is used in the analysis. Fig_2a.pngFig_2b.png
Figure 3: Observed charged particle multiplicity distribution in the full kinematic range of the analysis. The error bars represent the statistical uncertainty, the error band shows the combined statistical and systematic uncertainties. The data are compared to several Monte Carlo predictions, (a) Pythia 6 and Phojet, (b) Pythia 8 and Herwig++. Both plots show predictions of the LHCb tune of Pythia 6, which is used in the analysis. Fig_3a.pngFig_3b.png
Figure 4: Observed charged particle multiplicity distribution in different η bins. Error bars represent the statistical uncertainty, the error bands show the combined statistical and systematic uncertainties. The data are compared to Monte Carlo predictions, (a,b) Pythia 6 and Phojet, (c,d) Pythia 8 and Herwig++. All plots show predictions of the LHCb tune of Pythia 6, which is used in the analysis. Fig_4a.pngFig_4b.pngFig_4c.pngFig_4d.png
Figure 5: Observed charged particle multiplicity distribution in different η bins. Error bars represent the statistical uncertainty, the error bands show the combined statistical and systematic uncertainties. The data are compared to Monte Carlo predictions, (a-c) Pythia 6 and Phojet, (d-f) Pythia 8 and Herwig++. All plots show predictions of the LHCb tune of Pythia 6, which is used in the analysis. Fig_5a.png Fig_5b.png Fig_5c.png Fig_5d.png Fig_5e.png Fig_5f.png
Figure 6: Observed charged particle multiplicity distribution in different pT bins. Error bars represent the statistical uncertainty, the error bands show the combined statistical and systematic uncertainties. The data are compared to Monte Carlo predictions, (a,b) Pythia 6 and Phojet, (c,d) Pythia 8 and Herwig++. All plots show predictions of the LHCb tune of Pythia 6, which is used in the analysis. Fig_6a.pngFig6_b.pngFig_6c.pngFig_6d.png
Figure 7: Observed charged particle multiplicity distribution in different pT bins. Error bars represent the statistical uncertainty, the error bands show the combined statistical and systematic uncertainties. The data are compared to Monte Carlo predictions, (a-c) Pythia 6 and Phojet, (d-f) Pythia 8 and Herwig++. All plots show predictions of the LHCb tune of Pythia 6, which is used in the analysis. Fig_7a.pngFig_7b.pngFig_7c.png Fig_7d.pngFig_7e.pngFig_7f.png
-- KatharinaMueller - 20 Feb 2014
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