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

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[1] University at Albany,Department of Physics
[2] University of Alberta,Department of Physics
[3] Ankara University,High Energy Physics Division
[4] LAPP,Department of Physics
[5] CNRS/IN2P3 and Université de Savoie,Department of Physics
[6] Argonne National Laboratory,Physics Department
[7] University of Arizona,Physics Department
[8] The University of Texas at Arlington,Department for Physics and Technology
[9] University of Athens,Physics Division
[10] National Technical University of Athens,Department of Physics
[11] Institute of Physics,Department of Physics
[12] Azerbaijan Academy of Sciences,Department of Physics
[13] Institut de Física d'Altes Energies and Universitat Autònoma de Barcelona and ICREA,Department of Physics
[14] Institute of Physics,Physics Department
[15] University of Belgrade,Departamento de Física
[16] University of Bergen,Department of Physics
[17] Lawrence Berkeley National Laboratory and University of California,Departamento de Fisica
[18] Humboldt University,Physics Department
[19] Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics,Physics Department
[20] University of Bern,Department of Physics
[21] School of Physics and Astronomy,Department of Physics
[22] University of Birmingham,Department of Physics
[23] Bogazici University,Department of Physics and Astronomy
[24] INFN Sezione di Bologna,Physics Department
[25] Physikalisches Institut,Department of Physics
[26] University of Bonn,Department of Physics
[27] Boston University,Department of Physics
[28] Brandeis University,Department of Physics and Astronomy
[29] Universidade Federal do Rio De Janeiro COPPE/EE/IF,Departamento de Fisica Teorica C
[30] Brookhaven National Laboratory,15
[31] National Institute of Physics and Nuclear Engineering,Department of Physics
[32] Universidad de Buenos Aires,Department of Physics
[33] Cavendish Laboratory,Department of Physics
[34] University of Cambridge,Department of Physics and Astronomy
[35] Carleton University,Department of Physics
[36] CERN,Department of Physics and Astronomy
[37] Enrico Fermi Institute,Department of Physics
[38] University of Chicago,Department of Physics
[39] Pontificia Universidad Catòlica de Chile,Homer L. Dodge Department of Physics and Astronomy
[40] Institute of High Energy Physics,Department of Physics
[41] Chinese Academy of Sciences,Department of Physics
[42] Laboratoire de Physique Corpusculaire,Department of Physics
[43] Clermont Université and Université Blaise Pascal and CNRS/IN2P3,Department of Physics
[44] Aubiere Cedex,Department of Physics and Astronomy
[45] France.,Particle Physics Department
[46] Nevis Laboratory,Physics Department
[47] Columbia University,Department of Physics
[48] Niels Bohr Institute,Department of Physics and Astronomy
[49] University of Copenhagen,Department of Physics
[50] INFN Gruppo Collegato di Cosenza,Department of Physics
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Nature Communications | / 2卷
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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.
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