Abstract
A review of the ATLAS forward physics results is given with particular emphasis on the aspects of relevance for the cosmic rays community. These include proton-proton cross section measurements at s=7 TeV, diffractive physics studies using rapidity gaps, measurements of energy flow as a function of pseudorapidity, and the first cross section measurement performed in the recently started Run 2 at s=13 TeV. The ATLAS future perspectives will also be discussed, focused on the phase 1 upgrade project AFP, underlying its potential for a wide forward physics program both at low and high luminosity.
Highlights
One of the still open items in cosmic ray physics is the interpretation of the cosmic particle flux spectrum measured by the experiments
Remarkable is the detailed program on cross section measurements, differential inelastic cross section, transverse energy distributions in soft interactions, and jet production
The results are important for the cosmic rays community, in particular for the modelling of the showers, initiated in air by the cosmic particles of high energy
Summary
One of the still open items in cosmic ray physics is the interpretation of the cosmic particle flux spectrum measured by the experiments. Detailed measurements of the proton-proton interaction in the forward region are a valuable input for the cosmic rays community as they can be used to tune the parameters of the models used for the description of the cosmic showers In this context, ATLAS has performed a wide set of measurements, including the proton-proton cross sections (both total, elastic and inelastic), the energy flow distribution as a function of the particles pseudorapidity, and jet production. ATLAS has performed a wide set of measurements, including the proton-proton cross sections (both total, elastic and inelastic), the energy flow distribution as a function of the particles pseudorapidity, and jet production Such a program can be perfomed thanks to a large set of forward detectors (described in section 2) aimed to detect particles emerging from the pp interaction close or even inside the beam-pipe at large pseudorapidity. The detector shows an efficiency for inelastic events close to 100%
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