Charm production and fragmentation fractions at midrapidity in pp collisions at $\sqrt{s} = 13$ TeV
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| Format: | Preprint |
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2023
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| _version_ | 1866914632948514816 |
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| author | ALICE Collaboration |
| author_facet | ALICE Collaboration |
| contents | Measurements of the production cross sections of prompt ${\rm D^0}$, ${\rm D^+}$, ${\rm D^{\ast +}}$, ${\rm D_s^+}$, ${\rm Λ_{c}^{+}}$, and ${\rm Ξ_{c}^{+}}$ charm hadrons at midrapidity in proton$-$proton collisions at $\sqrt{s}=13$ TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum ($p_{\rm T}$) are provided with improved precision and granularity. The ratios of $p_{\rm T}$-differential meson production cross sections based on this publication and on measurements at different rapidity and collision energy provide a constraint on gluon parton distribution functions at low values of Bjorken-$x$ ($10^{-5}-10^{-4}$). The measurements of ${\rm Λ_{c}^{+}}$ (${\rm Ξ_{c}^{+}}$) baryon production extend the measured $p_{\rm T}$ intervals down to $p_{\rm T}=0(3)$~GeV$/c$. These measurements are used to determine the charm-quark fragmentation fractions and the ${\rm c\overline{c}}$ production cross section at midrapidity ($|y|<0.5$) based on the sum of the cross sections of the weakly-decaying ground-state charm hadrons ${\rm D^0}$, ${\rm D^+}$, ${\rm D_s^+}$, ${\rm Λ_{c}^{+}}$, ${\rm Ξ_{c}^{0}}$ and, for the first time, ${\rm Ξ_{c}^{+}}$, and of the strongly-decaying J/$psi$ mesons. The first measurements of ${\rm Ξ_{c}^{+}}$ and ${\rm Σ_{c}^{0,++}}$ fragmentation fractions at midrapidity are also reported. A significantly larger fraction of charm quarks hadronising to baryons is found compared to e$^+$e$^-$ and ep collisions. The ${\rm c\overline{c}}$ production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_04877 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Charm production and fragmentation fractions at midrapidity in pp collisions at $\sqrt{s} = 13$ TeV ALICE Collaboration High Energy Physics - Experiment Nuclear Experiment Measurements of the production cross sections of prompt ${\rm D^0}$, ${\rm D^+}$, ${\rm D^{\ast +}}$, ${\rm D_s^+}$, ${\rm Λ_{c}^{+}}$, and ${\rm Ξ_{c}^{+}}$ charm hadrons at midrapidity in proton$-$proton collisions at $\sqrt{s}=13$ TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum ($p_{\rm T}$) are provided with improved precision and granularity. The ratios of $p_{\rm T}$-differential meson production cross sections based on this publication and on measurements at different rapidity and collision energy provide a constraint on gluon parton distribution functions at low values of Bjorken-$x$ ($10^{-5}-10^{-4}$). The measurements of ${\rm Λ_{c}^{+}}$ (${\rm Ξ_{c}^{+}}$) baryon production extend the measured $p_{\rm T}$ intervals down to $p_{\rm T}=0(3)$~GeV$/c$. These measurements are used to determine the charm-quark fragmentation fractions and the ${\rm c\overline{c}}$ production cross section at midrapidity ($|y|<0.5$) based on the sum of the cross sections of the weakly-decaying ground-state charm hadrons ${\rm D^0}$, ${\rm D^+}$, ${\rm D_s^+}$, ${\rm Λ_{c}^{+}}$, ${\rm Ξ_{c}^{0}}$ and, for the first time, ${\rm Ξ_{c}^{+}}$, and of the strongly-decaying J/$psi$ mesons. The first measurements of ${\rm Ξ_{c}^{+}}$ and ${\rm Σ_{c}^{0,++}}$ fragmentation fractions at midrapidity are also reported. A significantly larger fraction of charm quarks hadronising to baryons is found compared to e$^+$e$^-$ and ep collisions. The ${\rm c\overline{c}}$ production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations. |
| title | Charm production and fragmentation fractions at midrapidity in pp collisions at $\sqrt{s} = 13$ TeV |
| topic | High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2308.04877 |