Measurement of the production of charm jets tagged with ${\rm D^0}$ mesons in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV

The ALICE collaboration
JHEP 06 (2023) 133, 2023.

Abstract (data abstract)
The measurement of the production of charm jets, identified by the presence of a $\mathrm{D^0}$ meson in the jet constituents, is presented in proton--proton collisions at centre-of-mass energies of $\sqrt{s}=5.02$ and $13$ TeV with the ALICE detector at the CERN LHC.The $\mathrm{D^0}$ mesons were reconstructed from their hadronic decay $\mathrm{D^0}\rightarrow\mathrm{K}^{-}\mathrm{\pi}^{0}$ and the respective charge conjugate. Jets were reconstructed from $\mathrm{D^0}$-meson candidates and charged particles using the anti-$k_\text{T}$ algorithm, in the jet transverse momentum range $5 < p_{\mathrm{T,ch\ jet}}< 50$ GeV/$c$, pseudorapidity $|\eta_{\mathrm{ch\ jet}}| < 0.9-R$, and with the jet resolution parameters $R = 0.2$, $0.4$, $0.6$. The distribution of the jet momentum fraction carried by a $\mathrm{D^0}$ meson along the jet axis ($z^{\mathrm{ch}}_{||}$) was measured in the range $0.4< z^{\mathrm{ch}}_{||} <1.0$ in four ranges of the jet transverse momentum.Comparisons of results for different collision energies and jet resolution parameters are also presented. The measurements are compared to predictions from Monte Carlo event generators based on leading-order and next-to-leading-order perturbative quantum chromodynamics calculations. A generally good description of the main features of the data is obtained in spite of a few discrepancies at low $p_{\mathrm{T,ch\ jet}}$. Measurements were also done for $R=0.3$ at $\sqrt{s}=5.02$ TeV and are shown along with their comparisons to theoretical predictions in an appendix to this paper.

  • $\mathrm{D^{0}}$ jets in pp 13 TeV

    Figure 7 (left), page 13.

    10.17182/hepdata.134031.v1/t1

    $p_{\mathrm{T,ch\ jet}}$-differential cross section of charm jets tagged with $\mathrm{D^{0}}$ mesons for $R=0.2$, $0.4$, and $0.6$ in pp collisions at...

  • $\mathrm{D^{0}}$ jets in pp 5.02 TeV

    Figure 7 (right), page 13.

    10.17182/hepdata.134031.v1/t2

    $p_{\mathrm{T,ch\ jet}}$-differential cross section of charm jets tagged with $\mathrm{D^{0}}$ mesons for $R=0.2$, $0.4$, and $0.6$ in pp collisions at...

  • Cross-section ratios $\sigma(13$ TeV$)/\sigma(5.02$ TeV$)$

    Figure 8, page 15.

    10.17182/hepdata.134031.v1/t3

    Ratio of $p_{\mathrm{T,ch\ jet}}$-differential cross section of charm jets tagged with $\mathrm{D^{0}}$ mesons in pp collisions at $\sqrt{s}=13$ TeV to...

  • Cross-section ratios 13 TeV, $\sigma(R=0.2)/\sigma(R=0.4,0.6)$

    Figure 9 (left), page 16.

    10.17182/hepdata.134031.v1/t4

    Ratio of $p_{\mathrm{T,ch\ jet}}$-differential cross section of charm jets tagged with $\mathrm{D^{0}}$ mesons for different $R$: $\sigma(R=0.2)/\sigma(R=0.4)$ and $\sigma(R=0.2)/\sigma(R=0.6)$ in...

  • Cross-section ratios 5.02 TeV, $\sigma(R=0.2)/\sigma(R=0.4,0.6)$

    Figure 9 (right), page 16.

    10.17182/hepdata.134031.v1/t5

    Ratio of $p_{\mathrm{T,ch\ jet}}$-differential cross section of charm jets tagged with $\mathrm{D^{0}}$ mesons for different $R$: $\sigma(R=0.2)/\sigma(R=0.4)$ and $\sigma(R=0.2)/\sigma(R=0.6)$ in...

  • $\mathrm{D^{0}}$ jets / Inclusive jets 5.02 TeV, R=0.2,0.4,0.6

    Figure 10, page 16.

    10.17182/hepdata.134031.v1/t6

    The fraction of $\mathrm{D^{0}}$ jets over inclusive charged-particle jets in pp collisions at $\sqrt{s}=5.02$ TeV for $R=0.2$, $0.4$, and $0.6$.

  • Jet momentum fraction ($z^{\mathrm{ch}}_{||}$) 13 TeV

    Figure 11, page 18.

    10.17182/hepdata.134031.v1/t7

    Distributions of $z^{\mathrm{ch}}_{||}$-differential yield of charm jets tagged with $\mathrm{D^{0}}$ mesons normalised by the number of $\mathrm{D^{0}}$ jets within each...

  • Jet momentum fraction ($z^{\mathrm{ch}}_{||}$) 5.02 TeV

    Figure 12, page 19.

    10.17182/hepdata.134031.v1/t8

    Distributions of $z^{\mathrm{ch}}_{||}$-differential yield of charm jets tagged with $\mathrm{D^{0}}$ mesons normalised by the number of $\mathrm{D^{0}}$ jets within each...

  • $\mathrm{D^{0}}$ jets in pp 5.02 TeV, R = 0.3

    Figure A.1, page 25.

    10.17182/hepdata.134031.v1/t9

    $p_{\mathrm{T,ch\ jet}}$-differential cross section of charm jets tagged with $\mathrm{D^{0}}$ mesons for $R=0.3$ in pp collisions at $\sqrt{s}=5.02$ TeV.

  • $\mathrm{D^{0}}$ jets / Inclusive jets 5.02 TeV, R=0.3

    Figure A.2, page 25.

    10.17182/hepdata.134031.v1/t10

    The fraction of $\mathrm{D^{0}}$ jets over inclusive charged-particle jets in pp collisions at $\sqrt{s}=5.02$ TeV for $R=0.3$.

  • Jet momentum fraction ($z^{\mathrm{ch}}_{||}$) 5.02 TeV, R=0.3

    Figure A.3, page 26.

    10.17182/hepdata.134031.v1/t11

    Distributions of $z^{\mathrm{ch}}_{||}$-differential yield of charm jets tagged with $\mathrm{D^{0}}$ mesons normalised by the number of $\mathrm{D^{0}}$ jets within each...

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