Abstract
The Large Hadron Collider provides collisions of protons and nuclei at the highest energies available in the laboratory. A variety of recent results for minimum-bias pp, p+Pb and Pb+Pb collisions obtained by the ATLAS experiment is presented. For pp collisions they include the total and inelastic cross section, properties of minimum-bias events, underlying event characteristics and measurements of diffractive processes. The results for p+Pb and Pb+Pb collisions that are relevant for cosmic ray studies are also presented.
Highlights
The primary goal of the Large Hadron Collider (LHC) is the study of the most energetic collisions of protons in which the Standard Model can be verified and new phenomena may be discovered
One of them is the Minimum Bias Trigger Scintillators detector (MBTS) which consists of two disks placed perpendicularly to the beam line at ±3.56 m from the nominal interaction point
In addition to cross-section measurements described in Section 3, the detectors measuring particles emitted at small angles provide information in this kinematic region which is important for proper simulation of the cascades from cosmic rays in the Monte Carlo models
Summary
The primary goal of the Large Hadron Collider (LHC) is the study of the most energetic collisions of protons in which the Standard Model can be verified and new phenomena may be discovered. Extensive studies of possible new phenomena expected in supersymmetry models and searches for exotic particles, including Dark Matter candidates, were performed, but no clear evidence of such new physics was seen so far. In the context of cosmic-ray studies more interesting than such rare processes are results obtained from minimum-bias measurements, which provide an opportunity to test Monte Carlo models used and to obtain predictions for collision energies exceeding those available in accelerators.
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