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| CMS-HIN-16-025 ; CERN-EP-2017-308 | ||
| Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV | ||
| CMS Collaboration | ||
| 24 December 2017 | ||
| Eur. Phys. J. C 78 (2018) 509 | ||
| Abstract: The nuclear modification factors of J/ψ and ψ(2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of √sNN= 5.02 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 μb−1 and 28 pb−1, respectively. The measurements are performed in the dimuon rapidity range of |y|< 2.4 as a function of centrality, rapidity, and transverse momentum (pT) from pT= 3 GeV/c in the most forward region and up to 50 GeV/c. Both prompt and nonprompt (coming from b hadron decays) J/ψ mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at √sNN= 2.76 TeV for the two J/ψ meson components. No dependence on rapidity is observed for either prompt or nonprompt J/ψ mesons. An indication of a lower prompt J/ψ meson suppression at pT> 25 GeV/c is seen with respect to that observed at intermediate pT. The prompt ψ(2S) meson yield is found to be more suppressed than that of the prompt J/ψ mesons in the entire pT range. | ||
| Links: e-print arXiv:1712.08959 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Invariant mass spectrum of μ+μ− pairs (left) and pseudo-proper decay length distribution (right) in PbPb collisions for 1.8 <|y|< 2.4, 4.5 <pT< 5.5 GeV/c, for all centralities. The result of the fit described in the text is also shown. |
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Figure 1-a:
Invariant mass spectrum of μ+μ− pairs in PbPb collisions for 1.8 <|y|< 2.4, 4.5 <pT< 5.5 GeV/c, for all centralities. The result of the fit described in the text is also shown. |
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Figure 1-b:
Pseudo-proper decay length distribution in PbPb collisions for 1.8 <|y|< 2.4, 4.5 <pT< 5.5 GeV/c, for all centralities. The result of the fit described in the text is also shown. |
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Figure 2:
Fraction of J/ψ mesons coming from the decay of b hadrons, i.e. nonprompt J/ψ meson fraction, as a function of dimuon pT (left) and rapidity (right) for pp and PbPb collisions, for all centralities. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. |
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Figure 2-a:
Fraction of J/ψ mesons coming from the decay of b hadrons, i.e. nonprompt J/ψ meson fraction, as a function of dimuon pT for pp and PbPb collisions, for all centralities. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. |
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Figure 2-b:
Fraction of J/ψ mesons coming from the decay of b hadrons, i.e. nonprompt J/ψ meson fraction, as a function of dimuon rapidity for pp and PbPb collisions, for all centralities. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. |
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Figure 3:
Differential cross section of prompt J/ψ mesons (left) and J/ψ mesons from b hadrons (nonprompt J/ψ) (right) decaying into two muons as a function of dimuon pT (upper) and rapidity (lower) in pp and PbPb collisions. The PbPb cross sections are normalised by TAA for direct comparison. The bars (boxes) represent statistical (systematic) point-by-point uncertainties, while global uncertainties are written on the plots. |
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Figure 3-a:
Differential cross section of prompt J/ψ mesons decaying into two muons as a function of dimuon pT in pp and PbPb collisions. The PbPb cross sections are normalised by TAA for direct comparison. The bars (boxes) represent statistical (systematic) point-by-point uncertainties, while global uncertainties are written on the plots. |
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Figure 3-b:
Differential cross section of J/ψ mesons from b hadrons (nonprompt J/ψ) decaying into two muons as a function of dimuon pT in pp and PbPb collisions. The PbPb cross sections are normalised by TAA for direct comparison. The bars (boxes) represent statistical (systematic) point-by-point uncertainties, while global uncertainties are written on the plots. |
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Figure 3-c:
Differential cross section of prompt J/ψ mesons decaying into two muons as a function of dimuon rapidity in pp and PbPb collisions. The PbPb cross sections are normalised by TAA for direct comparison. The bars (boxes) represent statistical (systematic) point-by-point uncertainties, while global uncertainties are written on the plots. |
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Figure 3-d:
Differential cross section of J/ψ mesons from b hadrons (nonprompt J/ψ) decaying into two muons as a function of dimuon rapidity in pp and PbPb collisions. The PbPb cross sections are normalised by TAA for direct comparison. The bars (boxes) represent statistical (systematic) point-by-point uncertainties, while global uncertainties are written on the plots. |
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Figure 4:
Nuclear modification factor of prompt J/ψ mesons as a function of dimuon rapidity (upper left), Npart (upper right) and dimuon pT (lower) at √sNN= 5.02 TeV. For the results as a function of Npart the most central bin corresponds to 0-5%, and the most peripheral one to 70-100%. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 4-a:
Nuclear modification factor of prompt J/ψ mesons as a function of dimuon rapidity at √sNN= 5.02 TeV. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 4-b:
Nuclear modification factor of prompt J/ψ mesons as a function of Npart at √sNN= 5.02 TeV. The most central bin corresponds to 0-5%, and the most peripheral one to 70-100%. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 4-c:
Nuclear modification factor of prompt J/ψ mesons as a function of dimuon pT at √sNN= 5.02 TeV. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 5:
Nuclear modification factor of prompt J/ψ meson as a function of dimuon pT (left) and Npart (right), in the mid- and most forward rapidity intervals. For the results as a function of Npart the most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 5-a:
Nuclear modification factor of prompt J/ψ meson as a function of dimuon pT, in the mid- and most forward rapidity intervals. For the results as a function of Npart the most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 5-b:
Nuclear modification factor of prompt J/ψ meson as a function of Npart, in the mid- and most forward rapidity intervals. For the results as a function of Npart the most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 6:
Nuclear modification factor of prompt J/ψ mesons. Left : as a function of dimuon pT in three centrality bins. Right : as a function of Npart at moderate and high pT, in the forward 1.8 <|y|< 2.4 range. For the results as a function of Npart the most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 6-a:
Nuclear modification factor of prompt J/ψ mesons as a function of dimuon pT in three centrality bins. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 6-b:
Nuclear modification factor of prompt J/ψ mesons as a function of Npart at moderate and high pT, in the forward 1.8 <|y|< 2.4 range. The most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 7:
Nuclear modification factor of prompt J/ψ and ψ(2S) mesons as a function of Npart (left) and dimuon pT (right), at central (upper, starting at pT= 6.5 GeV/c) and forward (lower, starting at pT= 3.0 GeV/c) rapidity. The vertical arrows represent 95% confidence intervals in the bins where the double ratio measurement is consistent with 0 (see text). For the results as a function of Npart the most central bin corresponds to 0-10% (0-20%), and the most peripheral one to 50-100% (40-100%), for |y|< 1.6 (1.6 <|y|< 2.4). The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 7-a:
Nuclear modification factor of prompt J/ψ and ψ(2S) mesons as a function of Npart, at central (starting at pT= 6.5 GeV/c) rapidity. The vertical arrows represent 95% confidence intervals in the bins where the double ratio measurement is consistent with 0 (see text). The most central bin corresponds to 0-10% (0-20%), and the most peripheral one to 50-100% (40-100%), for |y|< 1.6 (1.6 <|y|< 2.4). The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 7-b:
Nuclear modification factor of prompt J/ψ and ψ(2S) mesons as a function of dimuon pT, at central (starting at pT= 6.5 GeV/c) rapidity. The vertical arrows represent 95% confidence intervals in the bins where the double ratio measurement is consistent with 0 (see text). The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 7-c:
Nuclear modification factor of prompt J/ψ and ψ(2S) mesons as a function of Npart, at forward (starting at pT= 3.0 GeV/c) rapidity. The vertical arrows represent 95% confidence intervals in the bins where the double ratio measurement is consistent with 0 (see text). The most central bin corresponds to 0-10% (0-20%), and the most peripheral one to 50-100% (40-100%), for |y|< 1.6 (1.6 <|y|< 2.4). The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 7-d:
Nuclear modification factor of prompt J/ψ and ψ(2S) mesons as a function of dimuon pT, at forward (starting at pT= 3.0 GeV/c) rapidity. The vertical arrows represent 95% confidence intervals in the bins where the double ratio measurement is consistent with 0 (see text). The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 8:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of dimuon rapidity (upper left), Npart (upper right) and dimuon pT (lower) at √sNN= 5.02 TeV. For the results as a function of Npart the most central bin corresponds to 0-5%, and the most peripheral one to 70-100%. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 8-a:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of dimuon rapidity at √sNN= 5.02 TeV. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 8-b:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of Npart at √sNN= 5.02 TeV. The most central bin corresponds to 0-5%, and the most peripheral one to 70-100%. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 8-c:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of dimuon pT at √sNN= 5.02 TeV. Results obtained at 2.76 TeV are overlaid for comparison [11]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 9:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of dimuon pT (left) and Npart (right) and in the mid- and most forward rapidity intervals. For the results as a function of Npart the most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
png pdf |
Figure 9-a:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of dimuon pT and in the mid- and most forward rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
png pdf |
Figure 9-b:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of Npart and in the mid- and most forward rapidity intervals. The most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 10:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ). Left : as a function of dimuon pT in three centrality bins. Right : as a function of Npart at moderate and high pT, in the forward 1.8 <|y|< 2.4 range. For the results as a function of Npart the most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 10-a:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of dimuon pT in three centrality bins. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
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Figure 10-b:
Nuclear modification factor of J/ψ mesons from b hadrons (nonprompt J/ψ) as a function of Npart at moderate and high pT, in the forward 1.8 <|y|< 2.4 range. The most central bin corresponds to 0-10%, and the most peripheral one to 50-100%. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at RAA= 1 indicate the size of the global relative uncertainties. |
| Summary |
|
Prompt and nonprompt J/ψ meson production has been studied in pp and PbPb collisions at √sNN= 5.02 TeV, as a function of rapidity, transverse momentum (pT), and collision centrality, in different kinematic and centrality ranges. Three observables were measured: nonprompt J/ψ fractions, prompt and nonprompt J/ψ cross sections for each collision system, and nuclear modification factors RAA. The RAA results show a strong centrality dependence, with an increasing suppression for increasing centrality. For both prompt and nonprompt J/ψ mesons no significant dependence on rapidity is observed. An indication of less suppression in the lowest pT range at forward rapidity is seen for both J/ψ components. Double-differential measurements show the same trend, and also suggest a stronger pT dependence in peripheral events. An indication of less suppression of the prompt J/ψ meson at high pT is seen with respect to that observed at intermediate pT. The measurements are consistent with previous results at √sNN= 2.76 TeV. Combined with previous results for the double ratio (Nψ(2S)/NJ/ψ)PbPb/(Nψ(2S)/NJ/ψ)pp, the current RAA values for J/ψ mesons are used to derive the prompt ψ(2S) meson RAA in PbPb collisions at √sNN= 5.02 TeV, as a function of pT and collision centrality, in two different rapidity ranges. The results show that the ψ(2S) is more suppressed than the J/ψ meson for all the kinematical ranges studied. No pT dependence is observed within the current uncertainties. Hints of an increase in suppression with increasing collision centrality are also observed. |
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