Comments on the observation of high multiplicity events at the LHC

Abstract

We analyze the structure of the high multiplicity events observed by the CMS collaboration at the LHC. We argue that the bulk of the observed correlations is due to the production of a pair of jets with p_t > 15 GeV/c. We also suggest that high multiplicity events are due to a combination of three effects: high underlying multiplicity for collisions at small impact parameters, upward fluctuations of the gluon density in the colliding protons, and production of hadrons in the fragmentation of dijets. The data analysis is suggested which may clarify the underlying dynamics of the high multiplicity events and probe fluctuations of the gluon field as a function of x.

8 pages, final version published in Phys.Rev. D rapid communications includes note added in proofs

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• Transverse nucleon structure and diagnostics of hard parton-parton processes at LHC
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• Measurement of D-meson production versus multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Revealing nucleon and nucleus flickering in pA collisions at the LHC
• Jets in multiparticle production in and beyond geometry of proton-proton collisions at the LHC
• Transverse nucleon structure and multiparton interactions
• Nucleon-nucleon collision profile and cross section fluctuations