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| CMS-PAS-HIN-16-025 | ||
| Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV | ||
| CMS Collaboration | ||
| July 2017 | ||
| 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{s_{\mathrm{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 $\mu$fb$^{-1}$ and 28 pb$^{-1}$, respectively. The measurements are performed in the $|y| < $ 2.4 rapidity range as a function of centrality, rapidity and transverse momentum ($p_\text{T}$), from $p_\text{T}=$ 3 GeV/$c$ in the most forward region and up to $p_\text{T}= $ 50 GeV/$c$. Both prompt $\mathrm{J}/\psi$ and nonprompt $\mathrm{J}/\psi$ (coming from b-hadron decays) are observed to be gradually suppressed with centrality, with a magnitude similar to the one observed at $\sqrt{s_{\mathrm{NN}}} = $ 2.76 TeV. No dependence on rapidity is observed, while prompt and nonprompt $\mathrm{J}/\psi$ are less suppressed at the lower and higher explored $p_\text{T}$. The prompt $ \psi (\text{2S}) $ is found to be more suppressed than the prompt $\mathrm{J}/\psi$ in the entire $p_\text{T}$ range. | ||
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These preliminary results are superseded in this paper, EPJC 78 (2018) 509. The superseded preliminary plots can be found here. |
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| Figures | Summary | Additional Figures | References | CMS Publications |
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| 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/$c$, all centralities. Also shown is the result of the fit described in the text. |
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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/$c$, all centralities. Also shown is the result of the fit described in the text. |
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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/$c$, all centralities. Also shown is the result of the fit described in the text. |
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Figure 2:
Nonprompt $\mathrm{J}/\psi$ fractions in pp collisions as a function of $ {p_{\mathrm {T}}} $ (left) and rapidity (right) for pp and PbPb collisions. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. |
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Figure 2-a:
Nonprompt $\mathrm{J}/\psi$ fractions in pp collisions as a function of $ {p_{\mathrm {T}}} $ for pp and PbPb collisions. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. |
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Figure 2-b:
Nonprompt $\mathrm{J}/\psi$ fractions in pp collisions as a function of rapidity for pp and PbPb collisions. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. |
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Figure 3:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of rapidity (top left), centrality (top right) and $ {p_{\mathrm {T}}} $ (bottom) at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =$ 1 indicate the scale of the global relative uncertainties. |
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Figure 3-a:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of rapidity at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =$ 1 indicate the scale of the global relative uncertainties. |
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Figure 3-b:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of centrality at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =$ 1 indicate the scale of the global relative uncertainties. |
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Figure 3-c:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =$ 1 indicate the scale of the global relative uncertainties. |
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Figure 4:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of $ {p_{\mathrm {T}}} $ (left) and centrality (right), in the mid and most forward rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 4-a:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of $ {p_{\mathrm {T}}} $, in the mid and most forward rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 4-b:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of centrality, in the mid and most forward rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 5:
Nuclear modification factor of prompt $\mathrm{J}/\psi$. Left: as a function of $ {p_{\mathrm {T}}} $ in three centrality bins. Right: as a function of centrality at moderate and high $ {p_{\mathrm {T}}} $, in the forward 1.8 $ < {| y | }< $ 2.4 range. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =1$ indicate the scale of the global relative uncertainties. |
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Figure 5-a:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of $ {p_{\mathrm {T}}} $ in three centrality bins. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =1$ indicate the scale of the global relative uncertainties. |
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Figure 5-b:
Nuclear modification factor of prompt $\mathrm{J}/\psi$ as a function of centrality at moderate and high $ {p_{\mathrm {T}}} $, in the forward 1.8 $ < {| y | }< $ 2.4 range. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =1$ indicate the scale of the global relative uncertainties. |
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Figure 6:
The nuclear modification factor for the prompt $\mathrm{J}/\psi$ and ${\psi \text {(2S)}}$ as a function of centrality (left) and $ {p_{\mathrm {T}}} $ (right), at central (top, starting at $ {p_{\mathrm {T}}} = $ 6.5 GeV/$c$) and forward (bottom, starting at $ {p_{\mathrm {T}}} = $ 3.0 GeV/$c$) rapidity. The vertical arrows represent 95% confidence intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 6-a:
The nuclear modification factor for the prompt $\mathrm{J}/\psi$ and ${\psi \text {(2S)}}$ as a function of centrality, at central (starting at $ {p_{\mathrm {T}}} = $ 6.5 GeV/$c$) rapidity. The vertical arrows represent 95% confidence intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 6-b:
The nuclear modification factor for the prompt $\mathrm{J}/\psi$ and ${\psi \text {(2S)}}$ as a function of $ {p_{\mathrm {T}}} $, at central (starting at $ {p_{\mathrm {T}}} = $ 6.5 GeV/$c$) rapidity. The vertical arrows represent 95% confidence intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 6-c:
The nuclear modification factor for the prompt $\mathrm{J}/\psi$ and ${\psi \text {(2S)}}$ as a function of centrality, at forward (starting at $ {p_{\mathrm {T}}} = $ 3.0 GeV/$c$) rapidity. The vertical arrows represent 95% confidence intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 6-d:
The nuclear modification factor for the prompt $\mathrm{J}/\psi$ and ${\psi \text {(2S)}}$ as a function of $ {p_{\mathrm {T}}} $, at forward (starting at $ {p_{\mathrm {T}}} = $ 3.0 GeV/$c$) rapidity. The vertical arrows represent 95% confidence intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 7:
Nuclear modification factor as a function of rapidity (top left), centrality (top right) and $ {p_{\mathrm {T}}} $ (bottom) for the nonprompt $\mathrm{J}/\psi$ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 7-a:
Nuclear modification factor as a function of rapidity for the nonprompt $\mathrm{J}/\psi$ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 7-b:
Nuclear modification factor as a function of centrality for the nonprompt $\mathrm{J}/\psi$ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 7-c:
Nuclear modification factor as a function of $ {p_{\mathrm {T}}} $ for the nonprompt $\mathrm{J}/\psi$ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison [10]. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 8:
Nuclear modification factor of nonprompt $\mathrm{J}/\psi$ as a function of $ {p_{\mathrm {T}}} $ (left) and centrality (right) and in the mid and most forward rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 8-a:
Nuclear modification factor of nonprompt $\mathrm{J}/\psi$ as a function of $ {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_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 8-b:
Nuclear modification factor of nonprompt $\mathrm{J}/\psi$ as a function of centrality and in the mid and most forward rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 9:
The nuclear modification factor as a function of $ {p_{\mathrm {T}}} $ for the nonprompt $\mathrm{J}/\psi$ in two centrality bins. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 9-a:
The nuclear modification factor as a function of $ {p_{\mathrm {T}}} $ for the nonprompt $\mathrm{J}/\psi$ in centrality bin $| y | < $ 2,4. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Figure 9-b:
The nuclear modification factor as a function of $ {p_{\mathrm {T}}} $ for the nonprompt $\mathrm{J}/\psi$ in centrality bin 1.8 $ < | y | < $ 2.4. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
| Summary |
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Prompt and nonprompt $\mathrm{J}/\psi$ production has been studied in pp and PbPb collisions at ${\sqrt{s_{_{\text{NN}}}}} = $ 5.02 TeV, as a function of rapidity, transverse momentum and collision centrality in different kinematic and centrality ranges. Two observables were measured: nonprompt $\mathrm{J}/\psi$ fractions and prompt and nonprompt $\mathrm{J}/\psi$ nuclear modification factors ${R_{AA}}$. The latter show a strong centrality dependence, with an increasing suppression towards central events. No significant rapidity dependence, and a smaller suppression at the lowest and highest $ p_{\mathrm{T}}$ ranges are observed for both prompt and nonprompt $\mathrm{J}/\psi$. Double differential measurements confirm this observation, also hinting to a larger $ p_{\mathrm{T}} $ dependence in peripheral events. The measurements are consistent with previous results at ${\sqrt{s_{_{\text{NN}}}}} = $ 2.76 TeV. The prompt ${\psi\text{(2S)}} $ ${R_{AA}} $ has also been measured in PbPb collisions at ${\sqrt{s_{_{\text{NN}}}}} = $ 5.02 TeV, as a function transverse momentum and collision centrality in two different rapidity ranges. The results show that the ${\psi\text{(2S)}} $ is more suppressed than the $\mathrm{J}/\psi$ mesons for all the kinematical ranges studied. No $ p_{\mathrm{T}} $ dependence is observed within the current uncertainties. Hints of an increasing suppression with collision centrality are also observed. |
| Additional Figures | |
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Additional Figure 1:
Nuclear modification factor of five prompt quarmonia as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02TeV, integrated over centrality. |
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Additional Figure 2:
Nuclear modification factor of five prompt quarmonia as a function of centrality at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. While bottomonium measurements are inclusive in $ {p_{\mathrm {T}}} $ , they start at $ {p_{\mathrm {T}}} = $ 6.5 GeV/$c$ for charmonia. |
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Additional Figure 3:
Nuclear modification factor of nonprompt $ \mathrm{J}/\psi $ (open beauty) and bottomonia (hidden beauty) as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV, integrated over centrality. |
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Additional Figure 4:
Nuclear modification factor of nonprompt $ \mathrm{J}/\psi $ (open beauty) and bottomonia (hidden beauty) as a function of centrality at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. While bottomonium measurements are inclusive in $ {p_{\mathrm {T}}} $ , they start at $ {p_{\mathrm {T}}} = $ 6.5 GeV/$c$ for nonprompt $ \mathrm{J}/\psi $ . |
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Additional Figure 5:
Nuclear modification factor of prompt $ \mathrm{J}/\psi $ (hidden charm) and D mesons (open charm) as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV, integrated over centrality. |
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Additional Figure 6:
Nuclear modification factor of prompt $ \mathrm{J}/\psi $ (hidden charm) and D mesons (open charm) as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV, integrated over centrality. |
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Additional Figure 7:
Nuclear modification factor of nonprompt $ \mathrm{J}/\psi $ and B mesons (open beauty), of Dmesons (open charm), and of charged hadrons as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV, integrated over centrality. |
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Additional Figure 8:
Nuclear modification factor of prompt $ \mathrm{J}/\psi $ as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. The low $ {p_{\mathrm {T}}} $ measurements obtained at forward rapidity are overlaid to those at $|y| < $ 2.4. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} =$ 1 indicate the scale of the global relative uncertainties. |
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Additional Figure 9:
Nuclear modification factor of nonprompt $ \mathrm{J}/\psi $ as a function of $ {p_{\mathrm {T}}} $ at $\sqrt {s_{\mathrm {NN}}} = $ 5.02 TeV. The low $ {p_{\mathrm {T}}} $ measurements obtained at forward rapidity are overlaid to those at $|y| < $ 2.4. Results obtained at $\sqrt {s_{\mathrm {NN}}} = $ 2.76 TeV are overlaid for comparison. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Additional Figure 10:
Nuclear modification factor of prompt $ \mathrm{J}/\psi $ as a function of $ {p_{\mathrm {T}}} $ in four rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Additional Figure 11:
Nuclear modification factor of nonprompt $ \mathrm{J}/\psi $ as a function of $ {p_{\mathrm {T}}} $ in four rapidity intervals. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Additional Figure 12:
Nuclear modification factor of prompt $ \mathrm{J}/\psi $ as a function of centrality in four rapidity intervals. Data points are slightly shifted horizontally for better visibility. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Additional Figure 13:
Nuclear modification factor of nonprompt $ \mathrm{J}/\psi $ as a function of centrality in four rapidity intervals. Data points are slightly shifted horizontally for better visibility. The bars (boxes) represent statistical (systematic) point-by-point uncertainties. The boxes plotted at $ {R_{AA}} = $ 1 indicate the scale of the global relative uncertainties. |
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Compact Muon Solenoid LHC, CERN |
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