Global properties of proton-proton collisions at √s=100 TeV

The global properties of the final states produced in hadronic interactions of protons at centre-of-mass energies of future hadron colliders (such as FCC-hh at CERN, and SppC in China), are studied. The predictions of various Monte Carlo (MC) event generators used in collider physics (pythia 6, pythia 8, and phojet) and in ultrahigh-energy cosmic-rays studies (epos, and qgsjet) are compared. Despite their different underlying modeling of hadronic interactions, their predictions for proton-proton (p-p) collisions at TeV are quite similar. The average of all MC predictions (except phojet) for the different observables are: (i) p-p inelastic cross sections sigma (inel) = 105 +/- 2 mb; (ii) total charged multiplicity N-ch = 150 +/- 20; (iii) charged particle pseudorapidity density at midrapidity dN(ch)/d eta| (eta=0) = 9.6 +/- 0.2; (iv) energy density at midrapidity dE/d eta| (eta=0) = 13.6 +/- 1.5 GeV, and dE/d eta| (eta=5) = 670 +/- 70 GeV at the edge of the central region; and (v) average transverse momenta at midrapidities aOE (c) p(T)> = 0.76 +/- 0.07 GeV/c. At midrapidity, epos and qgsjet-ii predict larger per-event multiplicity probabilities at very low (N-ch < 3) and very high (N-ch > 100) particle multiplicities, whereas pythia 6 and 8 feature higher yields in the intermediate region N-ch ae 30-80. These results provide useful information for the estimation of the detector occupancies and energy deposits from pileup collisions at the expected large FCC-hh/SppC luminosities.