The inclusive production of the charm-strange baryon $\Omega^{0}_{\rm c}$ is measured for the first time via its semileptonic decay into $\Omega^{-}\rm e^{+}\nu_{e}$ at midrapidity ($|y|<~0.8$) 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 ($p_{\rm T}$) differential cross section multiplied by the branching ratio is presented in the interval $2<~p_{\rm T}<~12~{\rm GeV}/c$. The branching-fraction ratio ${\rm BR}(\Omega^0_{\rm c} \rightarrow \Omega^{-}{\rm e}^{+}\nu_{\rm e})/ {\rm BR}(\Omega^0_{\rm c} \rightarrow \Omega^{-}{\pi}^{+})$ is measured to be 1.12 $\pm$ 0.22 (stat.) $\pm$ 0.27 (syst.). Comparisons with other experimental measurements, as well as with theoretical calculations, are presented.
Submitted to: PRD
e-Print: arXiv:2404.17272 | PDF | inSPIRE
CERN-EP-2024-112
Figure group
Figure 1
Left panel: invariant-mass distribution of opposite-sign pairs (black solid circle marker) and same-sign pairs (red solid square marker) in SE, and opposite-sign pairs (blue open square marker) in ME. Right panel: invariant-mass distribution of the \Omegac candidates obtained by subtracting the opposite-sign charge \eOmega pairs in ME from the opposite-sign charge pairs in SE (black solid circle marker), and \eOmega opposite-sign charge pairs coming from \Omegac decay from PYTHIA 8 (green open circle marker). |   |
Figure 2
Left panel: correlation matrix between the generated \Omegac baryon $p_{\rm T}$ and the reconstructed opposite-sign charge pairs, obtained from the simulation based on PYTHIA 8 described in Ref. . Right panel: product of $({\rm A}\times\varepsilon)$ for inclusive $\Omega^0_{\rm c}$ baryons in pp collisions at $\sqrt{s} =$ 13 TeV as a function of $p_{\rm T}$. |   |
Figure 3
Top panel: $p_{\rm T}$-differential production cross sections of inclusive \Omegac baryons multiplied by the branching ratios (BR) into $\Omega^{-}{\rm e}^{+}\nu_{\rm e}$ and $\Omega^{-}\pi^{+}$ in pp collisions at \tevt. Bottom panel: $p_{\rm T}$-differential branching-fraction ratio ${\rm BR}(\Omega^0_{\rm c} \rightarrow \Omega^{-}{\rm e}^{+}\nu_{\rm e})/ {\rm BR}(\Omega^0_{\rm c} \rightarrow \Omega^{-}{\pi}^{+})$. |  |
