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| CMS-PAS-HIN-16-007 | ||
| $\mathrm{D}^{0}$ meson $v_{n}$ harmonics in PbPb collisions at 5.02 TeV | ||
| CMS Collaboration | ||
| September 2016 | ||
| Abstract: The Fourier coefficients $v_{2}$ and $v_{3}$, which reflect the azimuthal anisotropy of $\mathrm{D}^{0}$ meson, is measured with scalar-product method in PbPb collisions at $ \sqrt{s_\mathrm{NN}} = $ 5.02 TeV with CMS. The measurement is done in a wide $p_{\mathrm{T}}$ range up to 40 GeV/$c$, for centrality classes 0-10%, 10-30% and 30-50%. It is the first measurement on $\mathrm{D}^{0}$ $v_{3}$ and the uncertainties on $\mathrm{D}^{0}$ $v_{2}$ are significantly improved compared with previous measurements. The measured $\mathrm{D}^{0}$ $v_{n}$ (n = 2, 3) is consistent with charged particle $v_{n}$ in central collisions, and begins to be lower than charged particles $v_{n}$ in $p_{\mathrm{T}}$ range 1 to 6 GeV/$c$ for more peripheral collisions. In high $p_{\mathrm{T}}$ range, non-zero $\mathrm{D}^{0}$ $v_{2}$ is also observed, which indicates the path length dependent energy loss of charm quark. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PRL 120 (2018) 202301. The superseded preliminary plots can be found here. |
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| Figures & Tables | Summary | Additional Figures | References | CMS Publications |
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| Figures | |
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Figure 1:
Examples of simultaneous fit on mass spectrum and $v_{2}$ (top) or $v_{3}$ (bottom) as a function of invariant mass in selected ${p_{\mathrm {T}}}$ intervals. |
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Figure 1-a:
Example of simultaneous fit on mass spectrum and $v_{2}$ as a function of invariant mass in selected ${p_{\mathrm {T}}}$ intervals. |
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Figure 1-b:
Example of simultaneous fit on mass spectrum and $v_{2}$ as a function of invariant mass in selected ${p_{\mathrm {T}}}$ intervals. |
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Figure 1-c:
Example of simultaneous fit on mass spectrum and $v_{3}$ as a function of invariant mass in selected ${p_{\mathrm {T}}}$ intervals. |
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Figure 1-d:
Example of simultaneous fit on mass spectrum and $v_{3}$ as a function of invariant mass in selected ${p_{\mathrm {T}}}$ intervals. |
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Figure 2:
Prompt ${\mathrm {D}^{0}}$ fractions in raw ${\mathrm {D}^{0}}$ yield as function of ${p_{\mathrm {T}}}$ for centrality classes 0-10% (left), 10-30% (middle) and 30-50% (right) with all analysis cuts (red circles) and without $b_{0} < $ 0.008 cm cut (blue squares). |
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Figure 3:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). Charged particle $v_{2}$ [21] in the same centrality class is also plotted for comparison. |
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Figure 4:
Prompt ${\mathrm {D}^{0}}$ $v_{3}$ for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). Charged particle $v_{3}$ [21] in the same centrality class is also plotted for comparison. |
| Tables | |
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Table 1:
Summary of systematic uncertainties for $v_{2}$ and $v_{3}$ for centrality class 30-50%. Absolute uncertainties are assigned. |
| Summary |
| In summary, azimuthal anisotropy $v_2$ and $v_3$ of $\mathrm{D}^0$ is measured with scalar-product method in PbPb collisions at $ \sqrt{s_\mathrm{NN}} = $ 5.02 TeV with CMS, which is the first measurement on $v_3$ of $\mathrm{D}^0$. To extract $v_2$ and $v_3$ of prompt $\mathrm{D}^0$, the systematic uncertainties from non-prompt $\mathrm{D}^0$ are studied in a data driven method. Prompt $\mathrm{D}^0$ $v_2$ is found to be positive in studied $p_{\mathrm{T}}$ range 1 to 40 GeV/$c$, and prompt $\mathrm{D}^0$ $v_3$ is also found to be positive in $p_{\mathrm{T}}$ range around 1 to 8 GeV/c. The measured prompt $\mathrm{D}^0$ $v_n$ ($n =$ 2, 3) is consistent with charged particle $v_n$ in central collisions, and is lower than $v_n$ of charged particles in $p_{\mathrm{T}}$ range 1 to 6 GeV/$c$ for more peripheral collisions. |
| Additional Figures | |
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Additional Figure 1:
Mass spectrum fit in ${p_{\mathrm {T}}}$ intervals 2-3 GeV/$c$ (a) and 20-40 GeV/$c$ (b) for centrality 0-10%. |
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Additional Figure 1-a:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 2-3 GeV/$c$ for centrality 0-10%. |
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Additional Figure 1-b:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 20-40 GeV/$c$ for centrality 0-10%. |
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Additional Figure 2:
Mass spectrum fit in ${p_{\mathrm {T}}}$ intervals 1-2 GeV/$c$ (a), 2-3 GeV/$c$ (b) and 20-40 GeV/$c$ (c) for centrality 10-30%. |
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Additional Figure 2-a:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 1-2 GeV/$c$ for centrality 10-30%. |
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Additional Figure 2-b:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 2-3 GeV/$c$ for centrality 10-30%. |
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Additional Figure 2-c:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 20-40 GeV/$c$ for centrality 10-30%. |
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Additional Figure 3:
Mass spectrum fit in ${p_{\mathrm {T}}}$ intervals 1-2 GeV/$c$ (a), 2-3 GeV/$c$ (b) and 20-40 GeV/$c$ (c) for centrality 30-50%. |
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Additional Figure 3-a:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 1-2 GeV/$c$ for centrality 30-50%. |
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Additional Figure 3-b:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 2-3 GeV/$c$ for centrality 30-50%. |
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Additional Figure 3-c:
Mass spectrum fit in ${p_{\mathrm {T}}}$ interval 20-40 GeV/$c$ for centrality 30-50%. |
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Additional Figure 4:
Example of template fit on impact parameter distributions to evaluate prompt ${\mathrm {D}^{0}}$ fraction in PbPb collisions in ${p_{\mathrm {T}}}$ interval 5-6 GeV/$c$ for centrality 10-30%. |
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Additional Figure 5:
Example of $\mathrm{d}^{2}N$/($\mathrm{d} {p_{\mathrm {T}}} \mathrm{d} \Delta \phi $) fit for $v_{2}^{obs}$ with $\Delta \phi $ bins method in ${p_{\mathrm {T}}}$ interval 5-6 GeV/$c$ for centrality 10-30%. |
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Additional Figure 6:
Prompt ${\mathrm {D}^{0}}$ fractions for centrality 0-10% (left), 10-30% (middle) and 30-50% (right) with all analysis cuts. |
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Additional Figure 7:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). |
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Additional Figure 8:
Prompt ${\mathrm {D}^{0}}$ $v_{3}$ for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). |
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Additional Figure 9:
${\mathrm {D}^{0}}$ $v_{2}$ from SP method and $\Delta \phi $ bins method for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). |
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Additional Figure 10:
${\mathrm {D}^{0}}$ $v_{3}$ from SP method and $\Delta \phi $ bins method for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). |
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Additional Figure 11:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). Calculations from theoretical models (PRC 94 014909 (2016), PLB 735 (2014) 445, JHEP 1602 (2016) 169 and PRD 91 074027 (2015)) are plotted for comparison. Charged particle $v_{2}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 12:
Prompt ${\mathrm {D}^{0}}$ $v_{3}$ for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). Calculations from LBT model (PRC 94 014909 (2016)) are plotted for comparison. Charged particle $v_{3}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 13:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ for centrality 0-10% (a), 10-30% (b) and 30-50% (c). Calculations from theoretical models (PRC 94 014909 (2016), PLB 735 (2014) 445, JHEP 1602 (2016) 169 and PRD 91 074027 (2015)) are plotted for comparison. Charged particle $v_{2}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 13-a:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ for centrality 0-10%. Calculations from theoretical models (PRC 94 014909 (2016), PLB 735 (2014) 445, JHEP 1602 (2016) 169 and PRD 91 074027 (2015)) are plotted for comparison. Charged particle $v_{2}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 13-b:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ for centrality 10-30%. Calculations from theoretical models (PRC 94 014909 (2016), PLB 735 (2014) 445, JHEP 1602 (2016) 169 and PRD 91 074027 (2015)) are plotted for comparison. Charged particle $v_{2}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 13-c:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ for centrality 30-50%. Calculations from theoretical models (PRC 94 014909 (2016), PLB 735 (2014) 445, JHEP 1602 (2016) 169 and PRD 91 074027 (2015)) are plotted for comparison. Charged particle $v_{2}$ in the same centrality class is also plotted for comparison. |
png pdf |
Additional Figure 14:
Prompt ${\mathrm {D}^{0}}$ $v_{3}$ for centrality 0-10% (a), 10-30% (b) and 30-50% (c). Calculations from LBT model (PRC 94 014909 (2016)) are plotted for comparison. Charged particle $v_{3}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 14-a:
Prompt ${\mathrm {D}^{0}}$ $v_{3}$ for centrality 0-10%. Calculations from LBT model (PRC 94 014909 (2016)) are plotted for comparison. Charged particle $v_{3}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 14-b:
Prompt ${\mathrm {D}^{0}}$ $v_{3}$ for centrality 10-30%. Calculations from LBT model (PRC 94 014909 (2016)) are plotted for comparison. Charged particle $v_{3}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 14-c:
Prompt ${\mathrm {D}^{0}}$ $v_{3}$ for centrality 30-50%. Calculations from LBT model (PRC 94 014909 (2016)) are plotted for comparison. Charged particle $v_{3}$ in the same centrality class is also plotted for comparison. |
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Additional Figure 15:
Prompt ${\mathrm {D}^{0}}$ $v_{2}$ compared with ALICE results (PRC 90 (2014) 034904) for centrality 0-10% (left), 10-30% (middle) and 30-50% (right). |
| References | ||||
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