First measurement of ${\mathrm{\Omega }}_{\mathrm{c}}^0$ production in pp collisions at $\sqrt{s}=13$ TeV

Abstract

The inclusive production of the charm-strange baryon ${\mathrm{\Omega }}_{\mathrm{c}}^0$ is measured for the first time via its hadronic decay into ${\mathrm{\Omega }}^{-}{\pi }^{+}$ at midrapidity ($|y|<0.5$) in proton-proton (pp) collisions at the centre-of-mass energy $\sqrt{s}=13$ TeV with the ALICE detector at the LHC. The transverse momentum ($p_{\mathrm{T}}$) differential cross section multiplied by the branching ratio is presented in the interval $2<p_{\mathrm{T}}<12\mathrm{GeV}/c$. The $p_{\mathrm{T}}$ dependence of the ${\mathrm{\Omega }}_{\mathrm{c}}^0$-baryon production relative to the prompt ${\mathrm{D}}^0$-meson and to the prompt ${\mathrm{\Xi }}_{\mathrm{c}}^0$-baryon production is compared to various models that take different hadronisation mechanisms into consideration. In the measured $p_{\mathrm{T}}$ interval, the ratio of the $p_{\mathrm{T}}$-integrated cross sections of ${\mathrm{\Omega }}_{\mathrm{c}}^0$ and prompt ${\Lambda }_{\mathrm{c}}^{+}$ baryons multiplied by the ${\mathrm{\Omega }}^{-}{\pi }^{+}$ branching ratio is found to be larger by a factor of about 20 with a significance of about 4$\sigma$ when compared to ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ collisions.

arXiv comment18 pages, 3 captioned figures, 1 table, authors from page 13, published version, figures at http://alice-publications.web.cern.ch/node/8213

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• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Topological $SU(3{)}_f$ approach for two-body ${\Omega }_c$ weak decays
• Measurement of the fraction of jet longitudinal momentum carried by ${\Lambda }_{\mathrm{c}}^{+}$ baryons in pp collisions
• Measurement of ${\Omega }_{\mathrm{c}}^0$ baryon production and branching-fraction ratio $\mathrm{BR}({\mathrm{\Omega }}_{\mathrm{c}}^0\to {\mathrm{\Omega }}^{-}{\mathrm{e}}^{+}{\nu }_{\mathrm{e}})/\mathrm{BR}({\mathrm{\Omega }}_{\mathrm{c}}^0\to {\mathrm{\Omega }}^{-}{\pi }^{+})$ in pp collisions at $\sqrt{s}$ = 13 TeV
• First measurement of ${\mathrm{D}}_{s1}(1^{+})(2536{)}^{+}$ and ${\mathrm{D}}_{s2}^{\ast }(2^{+})(2573{)}^{+}$ production in proton-proton collisions at $\sqrt{s}=13$ TeV at the LHC
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