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| CMS-PAS-FTR-18-024 | ||
| Open heavy flavor and quarkonia in heavy ion collisions at HL-LHC | ||
| CMS Collaboration | ||
| December 2018 | ||
| Abstract: The projected performance for heavy flavour hadrons and quarkonium measurements in the high luminosity phase of the LHC in pp and PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV is presented, focusing on $\textrm{J}/\psi$ and $\Upsilon(n\text{S})$ states (including the elliptic flow $v_2$), as well as $\mathrm{B}_\textrm{s}$ mesons and $\Lambda_\textrm{c}^+$ baryons. Projections for the nuclear modification factor of $\mathrm{B}^+$, $\mathrm{B}^0$ and $\mathrm{B}_\textrm{s}$ mesons in pPb data at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV are also reported. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Prompt $\textrm{J}/\psi$ and $ {\Upsilon \text {(1S)}} $ [$ {p_{\mathrm {T}}} ^{low}$,$ {p_{\mathrm {T}}} ^{up}$] boundaries as a function of luminosity. The boundaries are chosen in such a way the number of mesons in the bin for the corresponding luminosity equals the number of mesons found in the last $ {p_{\mathrm {T}}} $ bin of the analysis with a luminosity of 368 $\mu$b$^{-1}$. |
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Figure 1-a:
Prompt $\textrm{J}/\psi$ [$ {p_{\mathrm {T}}} ^{low}$,$ {p_{\mathrm {T}}} ^{up}$] boundaries as a function of luminosity. The boundaries are chosen in such a way the number of mesons in the bin for the corresponding luminosity equals the number of mesons found in the last $ {p_{\mathrm {T}}} $ bin of the analysis with a luminosity of 368 $\mu$b$^{-1}$. |
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Figure 1-b:
$ {\Upsilon \text {(1S)}} $ [$ {p_{\mathrm {T}}} ^{low}$,$ {p_{\mathrm {T}}} ^{up}$] boundaries as a function of luminosity. The boundaries are chosen in such a way the number of mesons in the bin for the corresponding luminosity equals the number of mesons found in the last $ {p_{\mathrm {T}}} $ bin of the analysis with a luminosity of 368 $\mu$b$^{-1}$. |
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Figure 2:
Projections of $ {R_\text {AA}} $ of $ {\Upsilon \text {(1S)}} $ and $ {\Upsilon \text {(2S)}} $ as a function of $ {p_{\mathrm {T}}} $ (left) and $y$ (right), assuming 10 nb$^{-1}$, and reduction of the total systematic uncertainty by 1/3. Central values are taken from Ref. [25] for the $ {p_{\mathrm {T}}} $ dependence and Ref. [26] for the $y$ dependence. |
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Figure 2-a:
Projections of $ {R_\text {AA}} $ of $ {\Upsilon \text {(1S)}} $ and $ {\Upsilon \text {(2S)}} $ as a function of $ {p_{\mathrm {T}}} $, assuming 10 nb$^{-1}$, and reduction of the total systematic uncertainty by 1/3. Central values are taken from Ref. [25]. |
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Figure 2-b:
Projections of $ {R_\text {AA}} $ of $ {\Upsilon \text {(1S)}} $ and $ {\Upsilon \text {(2S)}} $ as a function of $y$, assuming 10 nb$^{-1}$, and reduction of the total systematic uncertainty by 1/3. Central values are taken from Ref. [26]. |
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Figure 3:
Projections for $ {\Upsilon \text {(1S)}} $ (left) and $ {\Upsilon \text {(2S)}} $ (right) $v_2$, assuming 10 nb$^{-1}$. The projected data points are overlaid with the total theoretical prediction [25], where the primordial (green) and regenerated (blue) components are also shown separately. |
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Figure 3-a:
Projections for $ {\Upsilon \text {(1S)}} $ $v_2$, assuming 10 nb$^{-1}$. The projected data points are overlaid with the total theoretical prediction [25], where the primordial (green) and regenerated (blue) components are also shown separately. |
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Figure 3-b:
Projections for $ {\Upsilon \text {(2S)}} $ $v_2$, assuming 10 nb$^{-1}$. The projected data points are overlaid with the total theoretical prediction [25], where the primordial (green) and regenerated (blue) components are also shown separately. |
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Figure 4:
Current uncertainties on the $ {R_\text {AA}} $ of $ {\mathrm {B}_\mathrm {s}} $ in 2015 PbPb collisions [12] (left) and projection using 10 nb$^{-1}$ of PbPb data at $ {\sqrt {s_{_{\text {NN}}}}} = $ 5.02 TeV (right). The central values are taken from the TAMU model [32,33]. The $ {{\mathrm {B}^{+}}} $ and nonprompt $\textrm{J}/\psi$ uncertainties from current measurements [34,11] and their projection in 10 nb$^{-1}$ of PbPb data [1] are also shown. |
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Figure 5:
Expected ${\mathrm {p}} {\mathrm {K^+}} {\pi ^-}$ invariant mass spectrum in pp (4 $ < {p_{\mathrm {T}}} < $ 5 GeV/$c$, left) and PbPb (10 $ < {p_{\mathrm {T}}} < $ 20 GeV/$c$, centrality range 0-30%, right) collisions. The red line represents the signal on top of the background and the blue line represents the background. The signal fit function is double Gaussian and the background fit function is the 2nd-order Chebychev polynomial function. |
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Figure 5-a:
Expected ${\mathrm {p}} {\mathrm {K^+}} {\pi ^-}$ invariant mass spectrum in pp (4 $ < {p_{\mathrm {T}}} < $ 5 GeV/$c$) PbPb collisions. The red line represents the signal on top of the background and the blue line represents the background. The signal fit function is double Gaussian and the background fit function is the 2nd-order Chebychev polynomial function. |
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Figure 5-b:
Expected ${\mathrm {p}} {\mathrm {K^+}} {\pi ^-}$ invariant mass spectrum in PbPb (10 $ < {p_{\mathrm {T}}} < $ 20 GeV/$c$, centrality range 0-30%) collisions. The red line represents the signal on top of the background and the blue line represents the background. The signal fit function is double Gaussian and the background fit function is the 2nd-order Chebychev polynomial function. |
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Figure 6:
Projection of nuclear modification factors of $ {{\mathrm {B}^{+}}} $ (top left), ${{\mathrm {B}^0}}$ (top right) and $ {\mathrm {B}_\mathrm {s}} $ (bottom) in pPb collisions with 2 pb$^{-1}$ of pPb data. Predictions from POWLANG [41] model under different transport coefficients and the smearing of the initial condition. |
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Figure 6-a:
Projection of nuclear modification factors of $ {{\mathrm {B}^{+}}} $ in pPb collisions with 2 pb$^{-1}$ of pPb data. Predictions from POWLANG [41] model under different transport coefficients and the smearing of the initial condition. |
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Figure 6-b:
Projection of nuclear modification factors of ${{\mathrm {B}^0}}$ in pPb collisions with 2 pb$^{-1}$ of pPb data. Predictions from POWLANG [41] model under different transport coefficients and the smearing of the initial condition. |
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Figure 6-c:
Projection of nuclear modification factors of $ {\mathrm {B}_\mathrm {s}} $ in pPb collisions with 2 pb$^{-1}$ of pPb data. Predictions from POWLANG [41] model under different transport coefficients and the smearing of the initial condition. |
| Summary |
| Very precise and differential measurements of quarkonia and heavy flavour mesons will be made possible at the HL-LHC, benefiting from the very large data sample (10 nb$^{-1}$), combined with the excellent performance of the CMS detector in terms of pseudo-rapidity coverage, vertex reconstruction, muon tracking (identification and momentum resolution), and charged particle tracking. Quarkonia will be measured up to very high $ {p_{\mathrm{T}}} $, allowing for direct comparison to charged particles, and $ {{\mathrm{D^0}}} $ and B mesons, providing crucial information on parton energy loss. The precise measurement of $\Upsilon(n\text{S}) {R_\text{AA}}$ as a function of $ {p_{\mathrm{T}}} $ and $|y|$ will allow to better understand the ingredients to bottomonium suppression in PbPb collisions, in complement to the first $\Upsilon(n\text{S})$ $v_2$ measurements in PbPb. Despite their limited precision, $v_2$ measurements will provide crucial inputs to models and be sensitive to a possible large signal, not unexpected given existing measurements of $\mathrm{J}/\psi$ $v_2$ in pPb and PbPb. $\mathrm{B}_\textrm{s}$ meson production in pp and PbPb collisions will also be measured with sufficient precision to be compared to $\mathrm{B^{+}}$ meson suppression and investigate strangeness enhancement due to recombination with strange quarks. $\Lambda_{\text{c}}$ baryon production will also be measured in pp and PbPb collisions, providing an additional handle for the study of charm quark dynamics in the medium, as well as the charm quark hadronisation to $\Lambda_{\text{c}}$ baryons. Finally, precise measurements of $\mathrm{B^{+}}$, $\mathrm{B}^{0}$ and $\mathrm{B}_\textrm{s}$\ mesons in pPb collisions will provide a baseline for the study of in-medium b quark energy loss in PbPb collisions. |
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