CMS-PAS-HIN-16-001 | ||
D0 meson nuclear modification factor in PbPb collisions at √sNN= 5.02 TeV | ||
CMS Collaboration | ||
June 2016 | ||
Abstract: D0 meson production has been measured in pp and PbPb collisions at √sNN= 5.02 TeV in the central rapidity, |y|< 1 , and in the transverse momentum range between 2 and 100 GeV/c with the CMS detector at the LHC. The proton-proton dataset used for this analysis corresponds to an integrated luminosity of 25.8 pb−1, while the PbPb dataset corresponds to 404 μb−1. The measured D0 spectrum in pp collisions is well described by perturbative QCD calculations. The nuclear modification factor RAA, defined as the ratio between the corrected PbPb yield and the proton-proton cross-section scaled by the number of incoherent nucleon-nucleon collisions, was also measured. In the transverse momentum range pT= 6-10 GeV/c, the D0 yield in the PbPb collisions is suppressed by a factor of 4-5 compared to the scaled proton-proton reference. At high pT, the suppression is significantly reduced, approaching roughly a factor of 1.5 for particles with pT in the range 60-100 GeV/c. The measured D0 nuclear modification factor is compatible with the charged particle RAA, within the experimental uncertainties. | ||
Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PLB 782 (2018) 474. The superseded preliminary plots can be found here. |
Figures | |
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Figure 1-a:
Examples of D0 candidate invariant mass distribution in pp (a) and PbPb collisions (b) at 5.02 TeV. |
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Figure 1-b:
Examples of D0 candidate invariant mass distribution in pp (a) and PbPb collisions (b) at 5.02 TeV. |
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Figure 2:
pT-differential cross section of prompt D0 mesons in pp collisions at √s= 5.02 TeV compared to the FONLL predictions [5]. |
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Figure 3-a:
Nuclear modification factor RAA as a function of pT in the centrality range 0-100% (a) and 0-10% (b). The inclusive charged particle RAA results are superimposed for equivalent event selections [21]. The D0 RAA are also compared to the predictions from various theoretical calculations [22,23,24,25,26,27,28,29,30]. |
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Figure 3-b:
Nuclear modification factor RAA as a function of pT in the centrality range 0-100% (a) and 0-10% (b). The inclusive charged particle RAA results are superimposed for equivalent event selections [21]. The D0 RAA are also compared to the predictions from various theoretical calculations [22,23,24,25,26,27,28,29,30]. |
Summary |
In this note, measurements of the prompt D0 production cross section and nuclear modification factor RAA in pp and PbPb collisions in the central rapidity region (|y|< 1) at √sNN= 5.02 TeV from CMS are presented. The RAA of prompt D0 mesons is measured as a function of the D0 transverse momentum from 2 to 100 GeV/c in two centrality ranges. The D0 RAA is found to be strongly suppressed in PbPb collisions when compared to the measured pp reference scaled by the number of binary nucleon-nucleon collisions. These measurements are consistent with the nuclear modification factors of charged hadrons in the corresponding centrality ranges. |
References | ||||
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Compact Muon Solenoid LHC, CERN |
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