Abstract
A summary is given of recent ATLAS results at the LHC, covering a number of areas that reflect the Collaboration's work in low energy physical observables in multiparticle events, elastic photon-photon scattering, proton-proton scattering and the tagging of diffractive events.
Highlights
A variety of processes can be studied at the LHC that involve relatively soft final states
The results can be used to compare different tunes of Monte Carlo (MC) generators, in particular P, and a selection of the distributions is shown in Fig. 1 The number of charged particles with pT > 100 MeV per event is well described at the 10–20% level by several tunes and models, but above 120 GeV the predictions diverge, and only E LHC is satisfactory of those considered here
The total summed pT in the transverse region and the number of charged tracks in this region are plotted as functions of the pT of the leading charged particle, and it is seen that at all LHC energies, the plotted quantities form a plateau-like sho√ulder once the leading pT reaches a value of approximately 5 GeV, which does not vary much with s, showing that the underlying event (UE) has√some fairly well-defined properties
Summary
A variety of processes can be studied at the LHC that involve relatively soft final states. This talk presents results from a selection of different measurements of this kind, with the aim of illustrating the wide range of physics that can be performed using the ATLAS detector [1]
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