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| CMS-PAS-HIN-18-017 | ||
| Measurement of prompt $\rm{D_{s}^{+}}$ production in pp and PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV | ||
| CMS Collaboration | ||
| November 2019 | ||
| Abstract: The transverse momentum ($p_{\mathrm{T}}$) spectra of prompt $\mathrm{D_{s}^{+}}$ mesons and charge conjugates are measured in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair using the CMS detector at the LHC. The measurement is performed through the ${\mathrm D_{s}^{+}} \to \phi \pi^{+} \to \mathrm{K^{+}K^{-}}\pi^{+}$ decay channels with the $\mathrm{D_{s}^{+}}$ rapidity range $|y| < $ 1.0 . The $\mathrm{D_{s}^{+}}$ production in the $p_{\mathrm{T}}$ range from 2 (6) GeV/$c$ to 40 GeV/$c$ in pp (PbPb) collisions is measured. Suppression of the $\mathrm{D_{s}^{+}}$ nuclear modification factor ($R_{\mathrm{AA}}$) in PbPb collisions suggests a strong interaction between charm quarks and the quark-gluon plasma. The double ratio of prompt $\mathrm{D_{s}^{+}}$ to prompt ${\mathrm D^{0}}$ production in pp and PbPb is consistent with a PHSD model calculation and consistent with unity, which indicates that strange charm meson enhancement in PbPb collisions is not significant in the measured $\mathrm{D_{s}^{+}}$ $p_{\mathrm{T}}$ interval. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Invariant mass distributions of ${\mathrm D_{s}^{+}}$ candidates with ${p_{\mathrm{T}}} =$ 6-8 GeV/$c$ (left) and 10-20 GeV/$c$ (right) in pp (top) and PbPb (bottom) collisions at 5.02 TeV. The red solid line represents the full fit and the blue dashed line represents the background component. |
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Figure 1-a:
Invariant mass distributions of ${\mathrm D_{s}^{+}}$ candidates with ${p_{\mathrm{T}}} =$ 6-8 GeV/$c$ (left) and 10-20 GeV/$c$ (right) in pp (top) and PbPb (bottom) collisions at 5.02 TeV. The red solid line represents the full fit and the blue dashed line represents the background component. |
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Figure 1-b:
Invariant mass distributions of ${\mathrm D_{s}^{+}}$ candidates with ${p_{\mathrm{T}}} =$ 6-8 GeV/$c$ (left) and 10-20 GeV/$c$ (right) in pp (top) and PbPb (bottom) collisions at 5.02 TeV. The red solid line represents the full fit and the blue dashed line represents the background component. |
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Figure 1-c:
Invariant mass distributions of ${\mathrm D_{s}^{+}}$ candidates with ${p_{\mathrm{T}}} =$ 6-8 GeV/$c$ (left) and 10-20 GeV/$c$ (right) in pp (top) and PbPb (bottom) collisions at 5.02 TeV. The red solid line represents the full fit and the blue dashed line represents the background component. |
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Figure 1-d:
Invariant mass distributions of ${\mathrm D_{s}^{+}}$ candidates with ${p_{\mathrm{T}}} =$ 6-8 GeV/$c$ (left) and 10-20 GeV/$c$ (right) in pp (top) and PbPb (bottom) collisions at 5.02 TeV. The red solid line represents the full fit and the blue dashed line represents the background component. |
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Figure 2:
Product of acceptance and efficiency for prompt ${\mathrm D_{s}^{+}}$ (Red) and nonprompt ${\mathrm D_{s}^{+}}$ (Blue) as a function of ${p_{\mathrm{T}}}$ in pp (left) and PbPb (right) collisions at 5.02 TeV. |
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Figure 2-a:
Product of acceptance and efficiency for prompt ${\mathrm D_{s}^{+}}$ (Red) and nonprompt ${\mathrm D_{s}^{+}}$ (Blue) as a function of ${p_{\mathrm{T}}}$ in pp (left) and PbPb (right) collisions at 5.02 TeV. |
png pdf |
Figure 2-b:
Product of acceptance and efficiency for prompt ${\mathrm D_{s}^{+}}$ (Red) and nonprompt ${\mathrm D_{s}^{+}}$ (Blue) as a function of ${p_{\mathrm{T}}}$ in pp (left) and PbPb (right) collisions at 5.02 TeV. |
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Figure 3:
Invariant mass fit of kaon pair of ${\rm D_{s}^{+}}$ candidate in pp (left) and PbPb (right) collisions at 5.02 TeV. |
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Figure 3-a:
Invariant mass fit of kaon pair of ${\rm D_{s}^{+}}$ candidate in pp (left) and PbPb (right) collisions at 5.02 TeV. |
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Figure 3-b:
Invariant mass fit of kaon pair of ${\rm D_{s}^{+}}$ candidate in pp (left) and PbPb (right) collisions at 5.02 TeV. |
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Figure 4:
${p_{\mathrm{T}}}$ differential cross section of ${\rm D_{s}^{+}}$ in pp and PbPb at 5.02 TeV. The vertical bars (boxes) represent the statistical (systematic) uncertainties. The red dots reprsent $p_{\mathrm{T}}$-differential cross section of ${\rm D_{s}^{+}}$ in pp collisions and the blue dots represnt $p_{\mathrm{T}}$-differential corrected yield of ${\rm D_{s}^{+}}$ mesons scaled by $T_{\mathrm{AA}}$ in PbPb collisions. The black solid line represent the PYTHIA 8 calculation. The lower panel shows the ratio between data and PYTHIA 8 calculation. |
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Figure 5:
(left) nuclear modification factor of ${\rm D_{s}^{+}}$ (right) ${\rm D_{s}^{+}} $/$ {\rm D^{0}}$ in pp and PbPb. The vertical bars (boxes) represent the statistical (systematic) uncertainties. The lower panel shows the double ratio of ${\rm D_{s}^{+}} $/$ {\rm D^{0}}$ in PbPb over in pp. The magenta and violet lines show the PHSD [59] [60] calculation, and the green line shows the TAMU [61] calculation. The global systematic uncertainty is represented by the grey box at ${\rm R_{\mathrm{AA}}} =$ 1. |
png pdf |
Figure 5-a:
(left) nuclear modification factor of ${\rm D_{s}^{+}}$ (right) ${\rm D_{s}^{+}} $/$ {\rm D^{0}}$ in pp and PbPb. The vertical bars (boxes) represent the statistical (systematic) uncertainties. The lower panel shows the double ratio of ${\rm D_{s}^{+}} $/$ {\rm D^{0}}$ in PbPb over in pp. The magenta and violet lines show the PHSD [59] [60] calculation, and the green line shows the TAMU [61] calculation. The global systematic uncertainty is represented by the grey box at ${\rm R_{\mathrm{AA}}} =$ 1. |
png pdf |
Figure 5-b:
(left) nuclear modification factor of ${\rm D_{s}^{+}}$ (right) ${\rm D_{s}^{+}} $/$ {\rm D^{0}}$ in pp and PbPb. The vertical bars (boxes) represent the statistical (systematic) uncertainties. The lower panel shows the double ratio of ${\rm D_{s}^{+}} $/$ {\rm D^{0}}$ in PbPb over in pp. The magenta and violet lines show the PHSD [59] [60] calculation, and the green line shows the TAMU [61] calculation. The global systematic uncertainty is represented by the grey box at ${\rm R_{\mathrm{AA}}} =$ 1. |
| Tables | |
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Table 1:
Summary of systematic uncertainties. The ranges quoted cover the ${p_{\mathrm{T}}}$ bins. |
| Summary |
| In this note, the $p_{\mathrm{T}}$-differential cross sections of prompt $\mathrm{D_s}$ mesons and prompt $\mathrm{D_s}$ nuclear modification factors in central rapidity ($|y| < $ 1) in pp and PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} =$ 5.02 TeV are presented. The prompt $\mathrm{D_s}$ $p_{\mathrm{T}}$-differential cross section in pp is found to be significantly lower than PYTHIA 8 calculations. The nuclear modification of prompt $\mathrm{D_s}$ is below unity which indicates strong interaction between charm quarks and the QGP medium. The ratio of prompt $\mathrm{D_s}$/$\mathrm{D^0}$ in pp is consistent with PYTHIA 8 and model calculations. The double ratio of prompt $\mathrm{D_s}$/$\mathrm{D^0}$ in PbPb over pp is consistent with unity, which is in agreement with the PHSD calculation. The $\mathrm{D_s}$ production in PbPb collsions do not show a significant enhancement relative to in pp collisions in the measured ${p_{\mathrm{T}}}$ range. Low ${p_{\mathrm{T}}}$ measurements with higher precision from the upcoming high-luminosity LHC heavy-ion runs could provide clearer information about the charm quark hadronization in QGP. |
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