Measurement of prompt D${}^0$, ${\Lambda }_c^{+}$, and ${\Sigma }_c^{0,++}$(2455) production in pp collisions at $\sqrt{s}=13$ TeV

Abstract

The $p_{\mathrm{T}}$-differential production cross sections of prompt D${}^0$, ${\Lambda }_{\mathrm{c}}^{+}$, and ${\Sigma }_{\mathrm{c}}^{0,++}(2455)$ charmed hadrons are measured at midrapidity ($|y|<0.5$) in pp collisions at $\sqrt{s}=13$ TeV. This is the first measurement of ${\Sigma }_{\mathrm{c}}^{0,++}$ production in hadronic collisions. Assuming the same production yield for the three ${\Sigma }_{\mathrm{c}}^{0,+,++}$ isospin states, the baryon-to-meson cross section ratios ${\Sigma }_{\mathrm{c}}^{0,+,++}/{\mathrm{D}}^0$ and ${\Lambda }_{\mathrm{c}}^{+}/{\mathrm{D}}^0$ are calculated in the transverse momentum ($p_{\mathrm{T}}$) intervals $2<p_{\mathrm{T}}<12$ GeV/$c$ and $1<p_{\mathrm{T}}<24$ GeV/$c$. Values significantly larger than in e${}^{+}$e${}^{-}$ collisions are observed, indicating for the first time that baryon enhancement in hadronic collisions also extends to the ${\Sigma }_{\mathrm{c}}$. The feed-down contribution to ${\Lambda }_{\mathrm{c}}^{+}$ production from ${\Sigma }_{\mathrm{c}}^{0,+,++}$ is also reported and is found to be larger than in e${}^{+}$e${}^{-}$ collisions. The data are compared with predictions from event generators and other phenomenological models, providing a sensitive test of the different charm-hadronisation mechanisms implemented in the models.

20 pages, 2 captioned figures + 2 captioned figures in appendix, authors from page 12, published version, figures at http://alice-publications.web.cern.ch/node/7197

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