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| CMS-PAS-HIN-18-007 | ||
| Measurement of the radial profile of $\mathrm{D^{0}}$ mesons in jets produced in pp and PbPb collisions at 5.02 TeV | ||
| CMS Collaboration | ||
| May 2018 | ||
| Abstract: The first measurement of the radial distributions of $\mathrm{D^{0}}$ mesons in jets in PbPb and pp collisions is presented. Data samples of PbPb and pp collisions at a nucleon-nucleon center-of-mass energy of ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}= $ 5.02 TeV, corresponding to integrated luminosities of 404 $\mu$b$^{-1}$ and 27.4 pb$^{-1}$, respectively, are recorded by the CMS detector at the LHC. The jets are reconstructed with an anti-$k_{\mathrm{T}}$ algorithm with a distance parameter of 0.3. The radial distribution of $\mathrm{D^{0}}$ mesons with transverse momentum $p_{\mathrm{T}} > $ 4 GeV/$c$ are measured with respect to the jet axis. Modifications of $\mathrm{D^{0}}$ radial distribution in PbPb collisions are presented by comparing PbPb spectra to the pp reference data, indicating a redistribution of the $\mathrm{D^{0}}$ mesons close to the jet axis. This measurement provides new experimental constraints on the mechanisms of heavy-flavor production in proton-proton collisions as well as on the processes of parton energy loss and diffusion of heavy quarks inside the strongly interacting medium produced in heavy ion collisions. | ||
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These preliminary results are superseded in this paper, Phy. Rev. Lett. 125 (2020) 102001. The superseded preliminary plots can be found here.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:
Distributions of $\mathrm{D^{0}}$ mesons in jets as a function of the distance from the jet axis for jets of $p_{\mathrm {T}}^{\mathrm {jet}} > $ 60 GeV/$c$ and $|\eta ^{\mathrm {\mathrm {jet}}}| < $ 1.6 measured in pp and PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}= $ 5.02 TeV. The measurement is performed in the $\mathrm{D^{0}}$ $ p_{\mathrm {T}}^{\mathrm {D}}$ range 4-20 GeV/$c$ (left) and for $p_{\mathrm {T}}^{\mathrm {D}} > $ 20 GeV/$c$ (right). Each spectrum is normalized to its integral in the region 0 $ < r < $ 0.3. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The ratios of the $\mathrm{D^{0}}$ radial distributions of PbPb to pp are also presented in the middle panel of each figure. The predictions from the PYTHIA 8 event generator are also superimposed, and in the bottom panel the ratios of the $\mathrm{D^{0}}$ radial distributions of pp over PYTHIA 8 predictions are presented. |
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Figure 1-a:
Distribution of $\mathrm{D^{0}}$ mesons in jets as a function of the distance from the jet axis for jets of $p_{\mathrm {T}}^{\mathrm {jet}} > $ 60 GeV/$c$ and $|\eta ^{\mathrm {\mathrm {jet}}}| < $ 1.6 measured in pp and PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}= $ 5.02 TeV. The measurement is performed in the $\mathrm{D^{0}}$ $ p_{\mathrm {T}}^{\mathrm {D}}$ range 4-20 GeV/$c$. Each spectrum is normalized to its integral in the region 0 $ < r < $ 0.3. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The ratio of the $\mathrm{D^{0}}$ radial distributions of PbPb to pp are also presented in the middle panel of the figure. The predictions from the PYTHIA 8 event generator are also superimposed, and in the bottom panel the ratios of the $\mathrm{D^{0}}$ radial distributions of pp over PYTHIA 8 predictions are presented. |
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Figure 1-b:
Distribution of $\mathrm{D^{0}}$ mesons in jets as a function of the distance from the jet axis for jets of $p_{\mathrm {T}}^{\mathrm {jet}} > $ 60 GeV/$c$ and $|\eta ^{\mathrm {\mathrm {jet}}}| < $ 1.6 measured in pp and PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}= $ 5.02 TeV. The measurement is performed for $p_{\mathrm {T}}^{\mathrm {D}} > $ 20 GeV/$c$. Each spectrum is normalized to its integral in the region 0 $ < r < $ 0.3. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The ratio of the $\mathrm{D^{0}}$ radial distributions of PbPb to pp are also presented in the middle panel of the figure. The predictions from the PYTHIA 8 event generator are also superimposed, and in the bottom panel the ratios of the $\mathrm{D^{0}}$ radial distributions of pp over PYTHIA 8 predictions are presented. |
| Summary |
| In summary, the first measurement of the radial distributions of $\mathrm{D^{0}}$ mesons in jets in PbPb and pp collisions is performed with the CMS detector using jets with $p_{\mathrm{T}}> $ 60 GeV/$c$ and $\mathrm{D^{0}}$ mesons with $p_{\mathrm{T}}> $ 4 GeV/$c$. The modification of the $\mathrm{D^{0}}$ radial distributions in PbPb collisions are studied by comparing the PbPb spectra to the pp reference data. The measurements indicate a modification of the $\mathrm{D^{0}}$ radial profile in PbPb collisions at low $\mathrm{D^{0}}$ $p_{\mathrm{T}}$ that vanishes at higher $\mathrm{D^{0}}$ $p_{\mathrm{T}}$. This measurement provides new experimental constraints on the mechanisms of heavy-flavor production in proton-proton collisions as well as on the processes of parton energy loss and diffusion of heavy quarks inside the quark-gluon plasma. |
| Additional Figures | |
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Additional Figure 1:
Examples of $D^{0}$ candidate invariant mass distributions in 0.05 $ < r < $ 0.1 pp collisions at 5.02 TeV, where $r$ is the angular distance between $D^{0}$ mesons and jets. |
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Additional Figure 2:
Examples of $D^{0}$ candidate invariant mass distributions in 0.05 $ < r < $ 0.1 in PbPb collisions at 5.02 TeV, where $r$ is the angular distance between $D^{0}$ mesons and jets. |
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Additional Figure 3:
$r$ distribution of $D^{0}$ with 4 $ < p_{T}^{D} < $ 20 GeV/c in PbPb collisions before background subtraction (black), the background contributions subtracted (Purple), and the result after background subtraction (orange). |
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Additional Figure 4:
Distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for 4 $ < p_{T}^{D} < $ 20 GeV/c measured in pp (blue) and PbPb (red) collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. |
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Additional Figure 5:
Distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for $p_{T}^{D} > $ 20 GeV/c measured in pp (blue) and PbPb (red) collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. |
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Additional Figure 6:
Distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for 4 $ < p_{T}^{D} < $ 20 GeV/c measured in pp (blue) and PbPb (red) collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. The ratio of the $D^{0}$ radial distributions of PbPb to pp are also presented in the lower panel. |
png pdf |
Additional Figure 7:
Distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for $p_{T}^{D} > $ 20 GeV/c measured in pp (blue) and PbPb (red) collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. The ratio of the $D^{0}$ radial distributions of PbPb to pp are also presented in the lower panel. |
png pdf |
Additional Figure 8:
The ratio of distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for 4 $ < p_{T}^{D} < $ 20 GeV/c measured in PbPb collisions to pp collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. |
png pdf |
Additional Figure 9:
The ratio of distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for $p_{T}^{D} > $ 20 GeV/c measured in PbPb collisions to pp collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. |
png pdf |
Additional Figure 10:
Distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for 4 $ < p_{T}^{D} < $ 20 GeV/c measured in pp (blue) and PbPb (red) collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. The predictions from the PYTHIA 8 event generator are also superimposed, and in the bottom panel the ratios of the $D^{0}$ radial profiles of pp over PYTHIA 8 predictions are presented. |
png pdf |
Additional Figure 11:
Distributions of $D^{0}$ mesons in jets as a function of the distance from the jet axis for $p_{T}^{D} > $ 20 GeV/c measured in pp (blue) and PbPb (red) collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}}=$ 5.02 TeV. The predictions from the PYTHIA 8 event generator are also superimposed, and in the bottom panel the ratios of the $D^{0}$ radial profiles of pp over PYTHIA 8 predictions are presented. |
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