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Inelastic proton-proton cross section at 13 TeV

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If you have a question about this talk, please contact Nick Barlow .

The inelastic cross-section is a basic property of the proton, yet it cannot be calculated from theory. In 1973 experiments at CERN discovered that it rises with energy—as Heisenberg predicted. Today, the LHC sets the energy frontier at 13 TeV, and theory predicts an asymptotic “black-disk” limit. I will present a recent measurement of the inelastic cross-section with the ATLAS detector. One of the key ingredients for this study is the rate at which the LHC produces proton collisions—the luminosity. I will describe how we measure the LHC luminosity and achieve a percent-level accuracy. This result is also a key input for cosmic ray experiments; I will discuss this connection, and planned new studies in this area.

This talk is part of the Cavendish HEP Seminars series.

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