Abstract
Pseudorapidity ( $$\eta $$ ) distributions of charged particles produced in proton–proton collisions at a centre-of-mass energy of 8 $$~\text {TeV}$$ are measured in the ranges $$|\eta | < 2.2$$ and $$5.3 < |\eta | < 6.4$$ covered by the CMS and TOTEM detectors, respectively. The data correspond to an integrated luminosity of $$\mathcal {L} = 45$$ $$~\upmu {\mathrm {b}}^{-1}$$ . Measurements are presented for three event categories. The most inclusive category is sensitive to 91–96 % of the total inelastic proton–proton cross section. The other two categories are disjoint subsets of the inclusive sample that are either enhanced or depleted in single diffractive dissociation events. The data are compared to models used to describe high-energy hadronic interactions. None of the models considered provide a consistent description of the measured distributions.
Highlights
Measurements of the yields and kinematic distributions of particles produced in proton–proton collisions at the Large Hadron Collider (LHC) can provide a better understanding of the mechanisms of hadron production in highenergy hadronic interactions
The results presented here focus on the charged-particle multiplicity density corrected down to zero transverse momentum, in the pseudorapidity ranges |η| < 2.2 and 5.3 < |η| < 6.4, where η is defined as − ln[tan(θ/2)], with θ being the polar angle of the particle trajectory with respect to the anticlockwise-beam direction
For the non-single diffractive dissociation (NSD)-enhanced sample, the predictions obtained from pythia6 and qgsjetII-04 agree with the data for most η bins
Summary
Measurements of the yields and kinematic distributions of particles produced in proton–proton (pp) collisions at the Large Hadron Collider (LHC) can provide a better understanding of the mechanisms of hadron production in highenergy hadronic interactions. Two types of processes contribute to the production of most of the final-state particles at LHC energies. As the particle multiplicity produced in these processes is modelled phenomenologically in the existing Monte Carlo (MC) event generators of hadronic interactions, experimental results provide an important input for tuning of the models. Inclusive measurements of the η and pT distributions of charged particles have previously been performed in pp and pp collisions for different centre-of-mass energies and phase space regions [3,4,5,6,7,8,9,10,11,12,13,14]
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