Measurement of the production cross section of prompt ${\Xi }_{\mathrm{c}}^0$ baryons at midrapidity in pp collisions at $\sqrt{s}$ = 5.02 TeV

Abstract

The transverse momentum ($p_{\mathrm{T}}$) differential cross section of the charm-strange baryon ${\Xi }_{\mathrm{c}}^0$ is measured at midrapidity ($|y|<$ 0.5) via its semileptonic decay into ${\mathrm{e}}^{+}{\Xi }^{-}{\nu }_{\mathrm{e}}$ in pp collisions at $\sqrt{s}$ = 5.02 TeV with the ALICE detector at the LHC. The ratio of the $p_{\mathrm{T}}$-differential ${\Xi }_{\mathrm{c}}^0$-baryon and ${\mathrm{D}}^0$-meson production cross sections is also reported. The measurements are compared with simulations with different tunes of the PYTHIA 8 event generator, with predictions from a statistical hadronisation model (SHM) with a largely augmented set of charm-baryon states beyond the current lists of the Particle Data Group, and with models including hadronisation via quark coalescence. The $p_{\mathrm{T}}$-integrated cross section of prompt ${\Xi }_{\mathrm{c}}^0$-baryon production at midrapidity is also reported, which is used to calculate the baryon-to-meson ratio ${\Xi }_{\mathrm{c}}^0/{\mathrm{D}}^0=0.20\pm 0.04{(stat.)}_{-0.07}^{+0.08}(syst.)$. These results provide an additional indication of a modification of the charm fragmentation from ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ and ${\mathrm{e}}^{-}\mathrm{p}$ collisions to pp collisions.

arXiv comment26 pages, 6 captioned figure, 1 table, authors from page 21, published version, figures at http://alice-publications.web.cern.ch/node/7087

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