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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 $ \mathrm{J}/\psi $ and $ {\psi\text{(2S)}} $ mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of ${\sqrt{\smash[b]{s_{_{\text{NN}}}}}} = $ 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 $\mu$b$^{-1}$ 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 ($ {p_{\mathrm{T}}} $) from ${p_{\mathrm{T}}}= $ 3 GeV/$c$ in the most forward region and up to 50 GeV/$c$. Both prompt and nonprompt (coming from b hadron decays) $ \mathrm{J}/\psi $ mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at ${\sqrt{\smash[b]{s_{_{\text{NN}}}}}} = $ 2.76 TeV for the two $ \mathrm{J}/\psi $ meson components. No dependence on rapidity is observed for either prompt or nonprompt $ \mathrm{J}/\psi $ mesons. An indication of a lower prompt $ \mathrm{J}/\psi $ meson suppression at ${p_{\mathrm{T}}} > $ 25 GeV/$c$ is seen with respect to that observed at intermediate ${p_{\mathrm{T}}}$. The prompt $ {\psi\text{(2S)}} $ meson yield is found to be more suppressed than that of the prompt $ \mathrm{J}/\psi $ mesons in the entire ${p_{\mathrm{T}}}$ 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 $ {{\mu ^+} {\mu ^-}} $ pairs (left) and pseudo-proper decay length distribution (right) in PbPb collisions for 1.8 $ < | y | < $ 2.4, 4.5 $ < {p_{\mathrm {T}}} < $ 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 $ {{\mu ^+} {\mu ^-}} $ pairs in PbPb collisions for 1.8 $ < | y | < $ 2.4, 4.5 $ < {p_{\mathrm {T}}} < $ 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 $ < {p_{\mathrm {T}}} < $ 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 $ \mathrm {J}/\psi $ mesons coming from the decay of b hadrons, i.e. nonprompt $ \mathrm {J}/\psi $ meson fraction, as a function of dimuon $ {p_{\mathrm {T}}} $ (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 $ \mathrm {J}/\psi $ mesons coming from the decay of b hadrons, i.e. nonprompt $ \mathrm {J}/\psi $ meson fraction, as a function of dimuon $ {p_{\mathrm {T}}} $ 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 $ \mathrm {J}/\psi $ mesons coming from the decay of b hadrons, i.e. nonprompt $ \mathrm {J}/\psi $ 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 $ \mathrm {J}/\psi $ mesons (left) and $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) (right) decaying into two muons as a function of dimuon $ {p_{\mathrm {T}}} $ (upper) and rapidity (lower) in pp and PbPb collisions. The PbPb cross sections are normalised by $ {T_{\text {AA}}} $ 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 $ \mathrm {J}/\psi $ mesons decaying into two muons as a function of dimuon $ {p_{\mathrm {T}}} $ in pp and PbPb collisions. The PbPb cross sections are normalised by $ {T_{\text {AA}}} $ 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 $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) decaying into two muons as a function of dimuon $ {p_{\mathrm {T}}} $ in pp and PbPb collisions. The PbPb cross sections are normalised by $ {T_{\text {AA}}} $ 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 $ \mathrm {J}/\psi $ mesons decaying into two muons as a function of dimuon rapidity in pp and PbPb collisions. The PbPb cross sections are normalised by $ {T_{\text {AA}}} $ 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 $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) decaying into two muons as a function of dimuon rapidity in pp and PbPb collisions. The PbPb cross sections are normalised by $ {T_{\text {AA}}} $ 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 $ \mathrm {J}/\psi $ mesons as a function of dimuon rapidity (upper left), $ {N_{\text {part}}} $ (upper right) and dimuon $ {p_{\mathrm {T}}} $ (lower) at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 5.02 TeV. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 4-a:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ mesons as a function of dimuon rapidity at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 4-b:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ mesons as a function of $ {N_{\text {part}}} $ at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 4-c:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ mesons as a function of dimuon $ {p_{\mathrm {T}}} $ at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 5:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ meson as a function of dimuon $ {p_{\mathrm {T}}} $ (left) and $ {N_{\text {part}}} $ (right), in the mid- and most forward rapidity intervals. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 5-a:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ meson as a function of dimuon $ {p_{\mathrm {T}}} $, in the mid- and most forward rapidity intervals. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 5-b:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ meson as a function of $ {N_{\text {part}}} $, in the mid- and most forward rapidity intervals. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 6:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ mesons. Left : as a function of dimuon $ {p_{\mathrm {T}}} $ in three centrality bins. Right : as a function of $ {N_{\text {part}}} $ at moderate and high $ {p_{\mathrm {T}}} $, in the forward 1.8 $ < | y | < $ 2.4 range. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 6-a:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ mesons as a function of dimuon $ {p_{\mathrm {T}}} $ in three centrality bins. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 6-b:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ mesons as a function of $ {N_{\text {part}}} $ at moderate and high $ {p_{\mathrm {T}}} $, 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 7:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ and $ {\psi \text {(2S)}} $ mesons as a function of $ {N_{\text {part}}} $ (left) and dimuon $ {p_{\mathrm {T}}} $ (right), at central (upper, starting at $ {p_{\mathrm {T}}} = $ 6.5 GeV/$c$) and forward (lower, starting at $ {p_{\mathrm {T}}} = $ 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 $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} = $ 1 indicate the size of the global relative uncertainties. |
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Figure 7-a:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ and $ {\psi \text {(2S)}} $ mesons as a function of $ {N_{\text {part}}} $, at central (starting at $ {p_{\mathrm {T}}} = $ 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 $ {R_{\text {AA}}} = $ 1 indicate the size of the global relative uncertainties. |
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Figure 7-b:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ and $ {\psi \text {(2S)}} $ mesons as a function of dimuon $ {p_{\mathrm {T}}} $, at central (starting at $ {p_{\mathrm {T}}} = $ 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 $ {R_{\text {AA}}} = $ 1 indicate the size of the global relative uncertainties. |
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Figure 7-c:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ and $ {\psi \text {(2S)}} $ mesons as a function of $ {N_{\text {part}}} $, at forward (starting at $ {p_{\mathrm {T}}} = $ 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 $ {R_{\text {AA}}} = $ 1 indicate the size of the global relative uncertainties. |
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Figure 7-d:
Nuclear modification factor of prompt $ \mathrm {J}/\psi $ and $ {\psi \text {(2S)}} $ mesons as a function of dimuon $ {p_{\mathrm {T}}} $, at forward (starting at $ {p_{\mathrm {T}}} = $ 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 $ {R_{\text {AA}}} = $ 1 indicate the size of the global relative uncertainties. |
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Figure 8:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of dimuon rapidity (upper left), $ {N_{\text {part}}} $ (upper right) and dimuon $ {p_{\mathrm {T}}} $ (lower) at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 5.02 TeV. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 8-a:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of dimuon rapidity at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 8-b:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of $ {N_{\text {part}}} $ at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 8-c:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of dimuon $ {p_{\mathrm {T}}} $ at $ {\sqrt {\smash [b]{s_{_{\text {NN}}}}}} = $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 9:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of dimuon $ {p_{\mathrm {T}}} $ (left) and $ {N_{\text {part}}} $ (right) and in the mid- and most forward rapidity intervals. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 9-a:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of dimuon $ {p_{\mathrm {T}}} $ and in the mid- and most forward rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 9-b:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 10:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $). Left : as a function of dimuon $ {p_{\mathrm {T}}} $ in three centrality bins. Right : as a function of $ {N_{\text {part}}} $ at moderate and high $ {p_{\mathrm {T}}} $, in the forward 1.8 $ < | y | < $ 2.4 range. For the results as a function of $ {N_{\text {part}}} $ 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 10-a:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of dimuon $ {p_{\mathrm {T}}} $ in three centrality bins. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
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Figure 10-b:
Nuclear modification factor of $ \mathrm {J}/\psi $ mesons from b hadrons (nonprompt $ \mathrm {J}/\psi $) as a function of $ {N_{\text {part}}} $ at moderate and high $ {p_{\mathrm {T}}} $, 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 $ {R_{\text {AA}}} =$ 1 indicate the size of the global relative uncertainties. |
| Summary |
|
Prompt and nonprompt $ \mathrm{J}/\psi $ meson production has been studied in pp and PbPb collisions at ${\sqrt{\smash[b]{s_{_{\text{NN}}}}}} = $ 5.02 TeV, as a function of rapidity, transverse momentum ($ {p_{\mathrm{T}}} $), and collision centrality, in different kinematic and centrality ranges. Three observables were measured: nonprompt $ \mathrm{J}/\psi $ fractions, prompt and nonprompt $ \mathrm{J}/\psi $ cross sections for each collision system, and nuclear modification factors $ {R_{\text{AA}}} $. The $ {R_{\text{AA}}} $ results show a strong centrality dependence, with an increasing suppression for increasing centrality. For both prompt and nonprompt $ \mathrm{J}/\psi $ mesons no significant dependence on rapidity is observed. An indication of less suppression in the lowest $ {p_{\mathrm{T}}} $ range at forward rapidity is seen for both $ \mathrm{J}/\psi $ components. Double-differential measurements show the same trend, and also suggest a stronger $ {p_{\mathrm{T}}} $ dependence in peripheral events. An indication of less suppression of the prompt $ \mathrm{J}/\psi $ meson at high $ {p_{\mathrm{T}}} $ is seen with respect to that observed at intermediate $ {p_{\mathrm{T}}} $. The measurements are consistent with previous results at ${\sqrt{\smash[b]{s_{_{\text{NN}}}}}} = $ 2.76 TeV. Combined with previous results for the double ratio $(N_{{\psi\text{(2S)}} }/N_{\mathrm{J}/\psi})_{\mathrm{PbPb}}/ (N_{{\psi\text{(2S)}} }/N_{\mathrm{J}/\psi})_{pp}$, the current $ {R_{\text{AA}}} $ values for $ \mathrm{J}/\psi $ mesons are used to derive the prompt $ {\psi\text{(2S)}} $ meson $ {R_{\text{AA}}} $ in PbPb collisions at ${\sqrt{\smash[b]{s_{_{\text{NN}}}}}} = $ 5.02 TeV, as a function of $ {p_{\mathrm{T}}} $ and collision centrality, in two different rapidity ranges. The results show that the $ {\psi\text{(2S)}} $ is more suppressed than the $ \mathrm{J}/\psi $ meson for all the kinematical ranges studied. No $ {p_{\mathrm{T}}} $ dependence is observed within the current uncertainties. Hints of an increase in suppression with increasing collision centrality are also observed. |
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