Measurement of the production cross section of prompt ${\Xi }_{\mathrm{c}}^0$ baryons in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The transverse momentum ($p_{\mathrm{T}}$) differential production cross section of the promptly produced charm-strange baryon ${\Xi }_{\mathrm{c}}^0$ (and its charge conjugate $\overline{{\Xi }_{\mathrm{c}}^0}$) is measured at midrapidity via its hadronic decay into ${\pi }^{+}{\Xi }^{-}$ in p$-$Pb collisions at a centre-of-mass energy per nucleon$-$nucleon collision $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC. The ${\Xi }_{\mathrm{c}}^0$ nuclear modification factor ($R_{\mathrm{pPb}}$), calculated from the cross sections in pp and p$-$Pb collisions, is presented and compared with the $R_{\mathrm{pPb}}$ of ${\Lambda }_{\mathrm{c}}^{+}$ baryons. The ratios between the $p_{\mathrm{T}}$-differential production cross section of ${\Xi }_{\mathrm{c}}^0$ baryons and those of ${\mathrm{D}}^0$ mesons and ${\Lambda }_{\mathrm{c}}^{+}$ baryons are also reported and compared with results at forward and backward rapidity from the LHCb Collaboration. The measurements of the production cross section of prompt ${\Xi }_{\mathrm{c}}^0$ baryons are compared with a model based on perturbative QCD calculations of charm-quark production cross sections, which includes only cold nuclear matter effects in p$-$Pb collisions, and underestimates the measurement by a factor of about 50. This discrepancy is reduced when the data is compared with a model that includes string formation beyond leading-colour approximation or in which hadronisation is implemented via quark coalescence. The $p_{\mathrm{T}}$-integrated cross section of prompt ${\Xi }_{\mathrm{c}}^0$-baryon production at midrapidity extrapolated down to $p_{\mathrm{T}}$ = 0 is also reported. These measurements offer insights and constraints for theoretical calculations of the hadronisation process. Additionally, they provide inputs for the calculation of the charm production cross section in p$-$Pb collisions at midrapidity.

29 pages, 6 captioned figures, 1 table, authors from page 23, published version, figures at http://alice-publications.web.cern.ch/node/10965

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