Measurement of $Ω^0_{\rm c}$ baryon production and branching-fraction ratio ${\rm BR(Ω^0_c \rightarrow Ω^- e^+ν_e)} / {\rm BR(Ω^0_c \rightarrow Ω^- π^+)}$ in pp collisions at $\sqrt{s}$ = 13 TeV

Abstract

The inclusive production of the charm-strange baryon $Ω^{0}_{\rm c}$ is measured for the first time via its semileptonic decay into $Ω^{-}\rm e^{+}ν_{e}$ 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 ${\rm BR}(Ω^0_{\rm c} \rightarrow Ω^{-}{\rm e}^{+}ν_{\rm e})/ {\rm BR}(Ω^0_{\rm c} \rightarrow Ω^{-}π^{+})$ 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.