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D-meson nuclear modification factor and v$_2$ in Pb-Pb collisions at the LHC
Nuclear Experiment · Submitted 8 Jan 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The results on the nuclear modification factor Raa for D mesons indicate a suppression of their yield in central collisions relative to binary-scaled pp collisions in a large momentum range.
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The abstract, sentence by sentence
We present the ALICE results on open heavy flavour, focusing on the exclusive reconstruction of charmed mesons via displaced decay topologies. These measurements benefit from the large Pb-Pb statistics collected in 2011. The results on the nuclear modification factor Raa for D mesons indicate a suppression of their yield in central collisions relative to binary-scaled pp collisions in a large momentum range. The comparison to the Raa of non-prompt J/psi (measured with CMS) indicates a difference in the suppression of charm and beauty, as expected according to the predicted mass hierarchy in energy loss models. The measurement of the azimuthal anisotropy of charmed mesons is also discussed. The observed positive second Fourier harmonic v2 for transverse momentum 2<pT<6 GeV/c in semi-peripheral events is a hint for collective motion of charm quarks. The results discussed above are also compared to theoretical models.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present the ALICE results on open heavy flavour, focusing on the exclusive reconstruction of charmed mesons via displaced decay topologies. | contribution 0.98 | 0.94 | 0.05 | asserted 0.96 |
| s1 | These measurements benefit from the large Pb-Pb statistics collected in 2011. | method 0.93 | 0.33 | 0.02 | asserted 0.99 |
| s2 | The results on the nuclear modification factor Raa for D mesons indicate a suppression of their yield in central collisions relative to binary-scaled pp collisions in a large momentum range. | result 1.00 | 0.95 | 0.46 | hedged possibility 0.76 |
| s3 | The comparison to the Raa of non-prompt J/psi (measured with CMS) indicates a difference in the suppression of charm and beauty, as expected according to the predicted mass hierarchy in energy loss models. | interpretation 0.82 | 0.44 | 0.15 | asserted 0.62 |
| s4 | The measurement of the azimuthal anisotropy of charmed mesons is also discussed. | contribution 0.95 | 0.74 | 0.04 | unclear 0.54 |
| s5 | The observed positive second Fourier harmonic v2 for transverse momentum 2<pT<6 GeV/c in semi-peripheral events is a hint for collective motion of charm quarks. | result 0.54 | 0.95 | 0.24 | hedged possibility 0.98 |
| s6 | The results discussed above are also compared to theoretical models. | contribution 0.46 | 0.51 | 0.04 | asserted 0.82 |
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The paper
Original abstract
We present the ALICE results on open heavy flavour, focusing on the exclusive reconstruction of charmed mesons via displaced decay topologies. These measurements benefit from the large Pb-Pb statistics collected in 2011. The results on the nuclear modification factor Raa for D mesons indicate a suppression of their yield in central collisions relative to binary-scaled pp collisions in a large momentum range. The comparison to the Raa of non-prompt J/psi (measured with CMS) indicates a difference in the suppression of charm and beauty, as expected according to the predicted mass hierarchy in energy loss models. The measurement of the azimuthal anisotropy of charmed mesons is also discussed. The observed positive second Fourier harmonic v2 for transverse momentum 2<pT<6 GeV/c in semi-peripheral events is a hint for collective motion of charm quarks. The results discussed above are also compared to theoretical models.
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References
How the literature uses it
What this paper does with the arXiv papers it cites
Papers whose main result relates to this one's
States the same result 1 paper
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A suppression of a factor 3 to 4 for transverse momenta larger than 5 GeV/c in the 20% most central collisions was observed.
What it cites · 6 sentences without a confident label
Builds on 1 paper
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The $$ of prompt $D$ mesons was measured with ALICE in the $0-7.5%$ centrality class using the data sample collected in 2011, which extends the measurements to a wider transverse momentum range ($2<<36$ GeV/$c$) compared to the published results from the 2010 data [ref] .
Suppression of high transverse momentum D mesons in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV · Results · 0.82
Uses the method or tool of 2 papers
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Due to the lack of statistics of the pp data at $√(s)=2.76$ TeV, the pp reference needed for the R$_AA$ analysis was determined by scaling the $D$-meson cross section measured at $√(s)=7$ TeV to $√(s)=2.76$ TeV using FONLL calculations [ref] .
Reference heavy flavour cross sections in pp collisions at sqrt(s) = 2.76 TeV, using a pQCD-driven sqrt(s)-scaling of ALICE measurements at sqrt(s) = 7 TeV · Heavy-flavour measurements in ALICE · 0.91
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In the $$ analysis, the prompt $D$-meson yield was obtained after subtracting the contribution of $D$ mesons from beauty hadron decays based on perturbative QCD calculations (FONLL, [ref] ).
Theoretical predictions for charm and bottom production at the LHC · Heavy-flavour measurements in ALICE · 0.97
Uses data or values from 1 paper
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Right: $v_2$ for prompt $D$ mesons in the 30-50% centrality class as a function of $$ [ref] superimposed to theoretical results.
D meson elliptic flow in non-central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76TeV · Results · 0.81
Compares with 5 papers
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While the model [ref] based on collisional and radiative energy loss in an anisotropic medium agrees with both prompt $D$ mesons and non-prompt J/$ψ$, the others seem to underestimate both (i.e. [ref] , based on collisional energy loss in an expanding medium) or to underestimate the suppression of non-prompt J/$ψ$ (i.e. [ref] , based on radiative energy loss and $D$-meson in-medium formation and dissociation). 0.39! < g r a p h i c s > 0.38! < g r a p h i c s > Left: $$ as a function of $$ for prompt $D^0$, $D^+$, $D^*+$ and $D_s^+$ for the $0-7.5%$ most central Pb-Pb collisions at $√(s)_NN=2.76$ TeV [ref] .
Jet quenching and elliptic flow at RHIC and LHC within a pQCD-based partonic transport model · Results · 0.94
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While the model [ref] based on collisional and radiative energy loss in an anisotropic medium agrees with both prompt $D$ mesons and non-prompt J/$ψ$, the others seem to underestimate both (i.e. [ref] , based on collisional energy loss in an expanding medium) or to underestimate the suppression of non-prompt J/$ψ$ (i.e. [ref] , based on radiative energy loss and $D$-meson in-medium formation and dissociation). 0.39! < g r a p h i c s > 0.38! < g r a p h i c s > Left: $$ as a function of $$ for prompt $D^0$, $D^+$, $D^*+$ and $D_s^+$ for the $0-7.5%$ most central Pb-Pb collisions at $√(s)_NN=2.76$ TeV [ref] .
Heavy-flavor suppression and azimuthal anisotropy in Pb-Pb collisions at sqrt(s_{NN}) = 2.76 TeV with the ALICE detector · Results · 0.94
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While the model [ref] based on collisional and radiative energy loss in an anisotropic medium agrees with both prompt $D$ mesons and non-prompt J/$ψ$, the others seem to underestimate both (i.e. [ref] , based on collisional energy loss in an expanding medium) or to underestimate the suppression of non-prompt J/$ψ$ (i.e. [ref] , based on radiative energy loss and $D$-meson in-medium formation and dissociation). 0.39! < g r a p h i c s > 0.38! < g r a p h i c s > Left: $$ as a function of $$ for prompt $D^0$, $D^+$, $D^*+$ and $D_s^+$ for the $0-7.5%$ most central Pb-Pb collisions at $√(s)_NN=2.76$ TeV [ref] .
Quenching and Tomography from RHIC to LHC · Results · 0.94
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