Probes of multiparticle production at the LHC

Abstract

We discuss how the main features of high-energy `soft' and `semihard' pp collisions may be described in terms of parton cascades and multi-Pomeron exchange. The interaction between Pomerons produces an effective infrared cutoff, k_{sat}, by the absorption of low k_t partons. This provides the possibility of extending the parton approach, used for `hard' processes, to also describe high-energy soft and semihard interactions. In particular, the presence of the cutoff k_{sat}, which increases with collider energy, means that the production and hadronization of minijets with p_t\gapproxeq k_{sat} are the main source of the soft secondaries. We propose several measurements which can be made at the LHC, that can further illuminate our understanding of the mechanism which drives the soft and semihard interactions. We show that the structure of Pomeron-Pomeron interactions may be studied in Double-Pomeron-Exchange processes and in the p_t distributions of secondaries near the edge of large rapidity gaps. The so-called `ridge effect' is another manifestation of the interaction of two partonic cascades.

15 pages, 4 figures, version published in J. Phys. G

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• Quadrupole Anisotropy in Dihadron Azimuthal Correlations in Central $d$$+$Au Collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV
• Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at sqrt(s_NN)=5.02 TeV
• Measurement of multi-particle azimuthal correlations in $pp$, $p$+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector
• Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for $pp$ collisions at $\sqrt{s}=5.02$ and $13$ TeV and $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Measurements of long-range near-side angular correlations in $\sqrt{s_{\text{NN}}}=5$TeV proton-lead collisions in the forward region
• Introduction to the physics of the total cross-section at LHC: A Review of Data and Models
• Possible multiparticle ridge-like correlations in very high multiplicity proton-proton collisions
• The diffraction cone shrinkage speed up with the collision energy
• The phenomenology of central exclusive production at hadron colliders
• Dynamics of diffractive dissociation
• New Physics at the Tevatron and the LHC May Relate to Dark Matter Visible in UHE Cosmic Rays
• New results on collectivity with LHCb
• Colliding Pomerons