Reference pp cross-sections for J/ψ studies in proton-lead collisions at √sNN = 5.02 TeV and comparisons between ALICE and LHCb results

The paper is available here.

LHCb-CONF-2013-013

Abstract

The ALICE and LHCb collaborations have studied J/ψ production at forward rapidities in proton-lead collisions at √s = 5.02 TeV using the dimuon channel. The evaluation of cold nuclear matter effects requires the knowledge of the corresponding J/ψ cross-section in pp collisions at the same centre-of-mass energy and in the same kinematic range. In this note the interpolation procedure used to determine this quantity and the related consistency checks are described. Finally, the results from the two experiments on nuclear modification factors are shortly summarized and found to be in good agreement.

Figures

(pdf and eps versions are available under attachments).

Caption Figure
Figure 1: Comparison of power-law (top left), linear (top right) and exponential (bottom) interpolations for the energy dependence of the J/ψ production cross-sections for the theoretical predictions given in Tab. 2. Ideally all curves should go through σ( √s = 5.02 TeV) = 5.3 μb. Fig1a.pngFig1b.pngFig1c.png
Figure 2: Cross-section interpolation for the ALICE data. The point at √s = 5.02 TeV is the result of the interpolation procedure, the error bar shows the result from error propagation of the experimental uncertainties of the measurements at √s = 2.76 and 7 TeV. Fig2.png
Figure 3: Cross-section interpolation by fitting theoretical predictions to the ALICE data points. Fig3a.pngFig3b.png
Figure 4: Cross-section interpolation for the LHCb data using three phenomenological models. The upper row shows the results for prompt J/ψ production (top left) and for J/ψ mesons from b-hadron decays (top right). The bottom row plot shows the interpolation for inclusive J/ψ production. The points at √s = 5.02 TeV are the nominal results of the interpolation procedure, the error bar is the result from error propagation of the experimental uncertainties of the measurements at √s = 2.76, 7 and 8 TeV. Fig4a.pngFig4b.pngFig4c.png
Figure 5: Differential cross-sections dσ/dy at √s = 2.76 and 7 TeV, as measured by ALICE. On the left hand plot the calculated values at √s = 5.02 TeV are separately shown for each interpolation function (linear, power law and exponential), together with their weighted average. The right hand figure shows fits to the interpolated dσ/dy values at √s = 5.02 TeV. See text for details. Fig5a.pngFig5b.png
Figure 6: Differential cross-section for inclusive J/ψ production in pPb collisions as a function of rapidity y (left) and transverse momentum pT (right). Fig6a.pngFig6b.png
Figure 7: Nuclear modification factor as a function of rapidity. The left hand plot shows the measurements integrated over the accessible kinematic range of both experiments, the right hand plot displays the differential measurement by the ALICE collaboration. Fig7a.pngFig7b.png
Figure 8: Forward-backward production ratio for inclusive J/ψ production in pPb collisions as a function of pT (left) and as a function of rapidity (right), for both experiments. Fig8a.pngFig8b.png
-- KatharinaMueller - 16 Jan 2014
Topic attachments
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Unknown file formateps Fig1a.eps r1 manage 46.6 K 2014-01-16 - 10:37 KatharinaMueller  
PDFpdf Fig1a.pdf r1 manage 12.2 K 2014-01-16 - 10:37 KatharinaMueller  
PNGpng Fig1a.png r1 manage 35.4 K 2014-01-16 - 10:37 KatharinaMueller  
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