Scientific article
Open access

Measurement of the inelastic proton–proton cross-section at √s=7 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inNature communications, vol. 2, no. 463, 14
Publication date2011

The dependence of the rate of proton–proton interactions on the centre-of-mass collision energy, √s, is of fundamental importance for both hadron collider physics and particle astrophysics. The dependence cannot yet be calculated from first principles; therefore, experimental measurements are needed. Here we present the first measurement of the inelastic proton–proton interaction cross-section at a centre-of-mass energy, √s, of 7 TeV using the ATLAS detector at the Large Hadron Collider. Events are selected by requiring hits on scintillation counters mounted in the forward region of the detector. An inelastic cross-section of 60.3±2.1 mb is measured for ξ>5×10−6, where ξ is calculated from the invariant mass, MX, of hadrons selected using the largest rapidity gap in the event. For diffractive events, this corresponds to requiring at least one of the dissociation masses to be larger than 15.7 GeV.

Citation (ISO format)
ATLAS Collaboration. Measurement of the inelastic proton–proton cross-section at √s=7 TeV with the ATLAS detector. In: Nature communications, 2011, vol. 2, n° 463, p. 14. doi: 10.1038/ncomms1472
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Article (Published version)
ISSN of the journal2041-1723

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