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Measurement of beauty and charm production in pp collisions at $\sqrt{s}$ = 5.02 TeV via non-prompt and prompt D mesons

The collaboration
JHEP 05 (2021) 220, 2021.

Abstract (data abstract)
The $p_{\mathrm{T}}$-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity ($|y|<0.5$) in proton--proton collisions at $\sqrt{s}=5.02~\mathrm{TeV}$. The data sample used in the analysis corresponds to an integrated luminosity of $(19.3\pm0.4)~\mathrm{nb^{-1}}$. D mesons were reconstructed from their decays $\mathrm{D^0 \to K^-\pi^+}$, $\mathrm{D^+\to K^-\pi^+\pi^+}$, and $\mathrm{D_s^+\to \phi\pi^+\to K^-K^+\pi^+}$ and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt $\mathrm{D^+}$ and $\mathrm{D_s^+}$ mesons have an extended $p_{\mathrm{T}}$ coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on $p_{\mathrm{T}}$, allowing for a more precise determination of their $p_{\mathrm{T}}$-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, $f_\mathrm{s}/(f_\mathrm{u}+f_\mathrm{d})$, is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The $\mathrm{b\overline{b}}$ production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is $\mathrm{d}\sigma_\mathrm{b\overline{b}}/\mathrm{d} y|_\mathrm{|y|<0.5} = 34.5 \pm 2.4 (\mathrm{stat}) ^{+4.7}_{-2.9} (\mathrm{tot.~syst})~\mathrm{\mu b}$. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section predicted by perturbative QCD calculations.

• #### Table 1

Data from Figure 6 left panel (filled red squares)

10.17182/hepdata.105047.v1/t1

$p_\mathrm{T}$-differential production cross section of non-prompt $\mathrm{D^0}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity interval $|y|<0.5$. Branching ratio...

• #### Table 2

Data from Figure 6 left panel (filled green triagles)

10.17182/hepdata.105047.v1/t2

$p_\mathrm{T}$-differential production cross section of non-prompt $\mathrm{D^+}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity interval $|y|<0.5$. Branching ratio...

• #### Table 3

Data from Figure 6 left panel (filled orange crosses)

10.17182/hepdata.105047.v1/t3

$p_\mathrm{T}$-differential production cross section of non-prompt $\mathrm{D_{s}^{+}}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity interval $|y|<0.5$. Branching ratio...

• #### Table 4

Data from Figure 6 left panel (empty red squares)

10.17182/hepdata.105047.v1/t4

$p_\mathrm{T}$-differential production cross section of prompt $\mathrm{D^0}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity interval $|y|<0.5$. Result already...

• #### Table 5

Data from Figure 6 left panel (empty green triagles)

10.17182/hepdata.105047.v1/t5

$p_\mathrm{T}$-differential production cross section of prompt $\mathrm{D^+}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity interval $|y|<0.5$. Branching ratio...

• #### Table 6

Data from Figure 6 left panel (empty orange crosses)

10.17182/hepdata.105047.v1/t6

$p_\mathrm{T}$-differential production cross section of prompt $\mathrm{D_{s}^{+}}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity interval $|y|<0.5$. Branching ratio...

• #### Table 7

Data from Figure 6 right panel (red squares)

10.17182/hepdata.105047.v1/t7

Ratio of $p_\mathrm{{T}}$-differential production cross sections of non-prompt and prompt $\mathrm{D^0}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity...

• #### Table 8

Data from Figure 6 right panel (green triagles)

10.17182/hepdata.105047.v1/t8

Ratio of $p_\mathrm{{T}}$-differential production cross sections of non-prompt and prompt $\mathrm{D^+}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity...

• #### Table 9

Data from Figure 6 right panel (orange crosses)

10.17182/hepdata.105047.v1/t9

Ratio of $p_\mathrm{{T}}$-differential production cross sections of non-prompt and prompt $\mathrm{D_{s}^{+}}$ mesons in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$ in the rapidity...

• #### Table 10

Data from Figure 9 left panel (red circles)

10.17182/hepdata.105047.v1/t10

Ratio between the $p_\mathrm{T}$-differential production cross sections of prompt $\mathrm{D^+}$ and $\mathrm{D^0}$ mesons in pp collision at $\sqrt{{s}}=5.02~\mathrm{{TeV}}$ in the...

• #### Table 11

Data from Figure 9 left panel (blue squares)

10.17182/hepdata.105047.v1/t11

Ratio between the $p_\mathrm{T}$-differential production cross sections of non-prompt $\mathrm{D^+}$ and $\mathrm{D^0}$ mesons in pp collision at $\sqrt{{s}}=5.02~\mathrm{{TeV}}$ in the...

• #### Table 12

Data from Figure 9 right panel (red circles)

10.17182/hepdata.105047.v1/t12

Ratio between the $p_\mathrm{T}$-differential production cross sections of prompt $\mathrm{D_{s}^{+}}$ mesons and the sum of $\mathrm{{D^+}}$ and $\mathrm{{D^0}}$ mesons in...

• #### Table 13

Data from Figure 9 right panel (blue squares)

10.17182/hepdata.105047.v1/t13

Ratio between the $p_\mathrm{T}$-differential production cross sections of non-prompt $\mathrm{D_{s}^{+}}$ mesons and the sum of $\mathrm{{D^+}}$ and $\mathrm{{D^0}}$ mesons in...

• #### Table 14

Data from Figure 10 and Formula 8

10.17182/hepdata.105047.v1/t14

Charm-quark fragmentation-fraction ratio $f_\mathrm{s}/(f_\mathrm{u}+f_\mathrm{d})$ in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$. Obtained by fitting the prompt $\mathrm{D_{s}^{+}} / (\mathrm{{D^+}}+\mathrm{{D^0}})$ ratio with a...

• #### Table 15

Data from Figure 11 and Formula 10

10.17182/hepdata.105047.v1/t15

Beauty-quark fragmentation-fraction ratio $f_\mathrm{s}/(f_\mathrm{u}+f_\mathrm{d})$ in pp collision at $\sqrt{s}=5.02~\mathrm{TeV}$. Obtained by fitting the non-prompt $\mathrm{D_{s}^{+}} / (\mathrm{{D^+}}+\mathrm{{D^0}})$ ratio with a...

• #### Table 16

Data from Figure 12, Figure 13 and Formula 12

10.17182/hepdata.105047.v1/t16

$\mathrm{d}\sigma_\mathrm{b\overline{b}}/\mathrm{d} y$ estimated from non-prompt $\mathrm{{D^0}}$, $\mathrm{{D^+}}$ and $\mathrm{D_{s}^{+}}$ mesons (black circles of Figure 12) measured in pp collision at...

• #### Table 17

Data from Table 4

10.17182/hepdata.105047.v1/t17

Production cross sections of prompt and non-prompt $\mathrm{{D^0}}$, $\mathrm{{D^+}}$ and $\mathrm{D_{s}^{+}}$ mesons in pp collision at $\sqrt{{s}}=5.02~\mathrm{{TeV}}$ in the rapidity...