Study of J/ψ production and cold nuclear matter effects in pPb collisions

The paper is available here.

arXiv: 1308.6729

more detailed information: ANA note 2013-059

Abstract

The production of J/ψ mesons with rapidity 1.5 < y < 4.0 or −5.0 < y < −2.5 and transverse momentum pT < 14 GeV/c is studied with the LHCb detector in proton-lead collisions at a proton-nucleon centre-of-mass energy √sNN = 5 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of about 1.6 nb−1 . For the first time the nuclear modification factor and forward-backward production ratio are determined separately for J/ψ mesons originating directly from the proton-nucleon collision and from b -hadron decays.

Figures

(pdf and eps versions are available under attachments).

Caption Figure
Figure 1: Projections of the combined fit on (a, b) dimuon invariant mass and (c, d) tz in two representative bins in the (a, c) forward and (b, d) backward samples. For the mass projections the (red solid curve) total fitted function is shown together with the (blue dotted curve) J/ψ signal and (green dotted curve) background contributions. For the tz projections the total fitted function is indicated by the solid red curve, the background by the green hatched area, the prompt signal by the blue area and J/ψ from b by the solid black curve. Fig1a.pngFig1b.pngFig1c.png Fig1d.png
Figure 2: Normalized distributions of (a) track multiplicity and the J/ψ (b) transverse momentum pT, (c) momentum p, and (d) rapidity in laboratory frame ylab in (black dots) forward and (red squares) backward regions of pPb collisions, and in (blue triangles) simulated pp collisions. The distributions are background subtracted using the sPlot technique. Fig2a.pngFig2b.png
Figure 3: Single differential production cross-sections for (black dots) prompt J/ψ and (red squares) J/ψ from b as functions of (a, b) pT and (c, d) y in the (a, c) forward and (b, d) backward regions. Fig3a.pngFig3b.png Fig3c.pngFig3d.png
Figure 4: Double differential production cross-sections for (a) prompt J/ψ mesons and (b) J/ψ from b in the forward samples. Fig4a.png Fig4b.png
Figure 5: Nuclear modification factor RpPb as a function of y for (a) prompt J/ψ mesons and (b) J/ψ from b, together with the theoretical predictions from (yellow dashed line and brown band) Ref. [2], (blue band) Ref. [3], and (green solid and blue dash-dotted lines) Ref. [4]. The inner error bars (delimited by the horizontal lines) show the statistical uncertainties; the outer ones show the statistical and systematic uncertainties added in quadrature. Fig5a.png Fig5b.png
Figure 6: Forward-backward production ratio RFB as a function of |y| for (a) prompt J/ψ mesons and (b) J/ψ from b, together with the theoretical predictions from (yellow dashed line and brown band) Ref. [2], (blue band) Ref. [3], and (green solid and blue dash-dotted lines) Ref. [4]. The inner error bars (delimited by the horizontal lines) show the statistical uncertainties; the outer ones show the statistical and systematic uncertainties added in quadrature. Fig6a.pngFig6b.png
Figure 7: Forward-backward production ratio RFB for (black dot) prompt J/ψ mesons and (red square) J/ψ from b as a function of pT in the rapidity range 2.5 < |y |< 4.0. The theoretical predictions from (blue band) Ref. [3] and (green solid and blue dash-dotted lines) Ref. [5] are for prompt J/ψ mesons. The inner error bars (delimited by the horizontal lines) show the statistical uncertainties; the outer ones show the statistical and systematic uncertainties added in quadrature. Fig7.png
-- KatharinaMueller - 16 Jan 2014
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PDFpdf Fig1a.pdf r1 manage 20.5 K 2014-01-16 - 10:06 KatharinaMueller  
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PDFpdf Fig1b.pdf r1 manage 20.5 K 2014-01-16 - 10:06 KatharinaMueller  
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