Role of gluons in soft and semi-hard multiple hadron production in pp collisions at LHC

Abstract

Hadron inclusive spectra in pp collisions are analyzed within the modified quark-gluon string model including both the longitudinal and transverse motion of quarks in the proton in the wide region of initial energies. The self-consistent analysis shows that the experimental data on the inclusive spectra of light hadrons like pions and kaons at ISR energies can be satisfactorily described at transverse momenta not larger than 1-2 GeV/c. We discuss some difficulties to apply this model at energies above the ISR and suggest to include the distribution of gluons in the proton unintegrated over the internal transverse momentum. It leads to an increase in the inclusive spectra of hadrons and allows us to extend the satisfactory description of the data in the central rapidity region at energies higher than ISR.

19 pages, 20 figures

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• Employing RHIC and LHC data to determine TMD gluon density in a proton
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• TMD parton showers for associated $\gamma$+jet production in electron-proton collisions at high energies
• Significance of non-perturbative input to TMD gluon density for hard processes at LHC
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• Ratio of kaon-to-pion production cross-sections in $BeBe$ collisions as a function of $\sqrt{s}$
• Nucleon structure and hard p-p processes at high energies
• Saturation of gluon density and soft p-p collisions at LHC