First measurement of Ωc0 production in pp collisions at s=13 TeV

Abstract

The inclusive production of the charm–strange baryon 0 c is measured for the first time via its hadronic decay into −π+ at midrapidity (|y| < 0.5) in proton–proton (pp) collisions at the centre-of-mass energy √s = 13 TeV with the ALICE detector at the LHC. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 2 < pT < 12 GeV/c. The pT dependence of the 0 c -baryon production relative to the prompt D0-meson and to the prompt 0 c -baryon production is compared to various models that take different hadronisation mechanisms into consideration. In the measured pT interval, the ratio of the pT-integrated cross sections of 0 c and prompt + c baryons multiplied by the −π+ branching ratio is found to be larger by a factor of about 20 with a significance of about 4σ when compared to e+e− collisions