Measurement of inelastic, single- and double-diffraction cross sections in proton-proton collisions at the LHC with ALICE

Abelev, B. and Adam, J. and Adamová, D. and Adare, A. M. and Aggarwal, M. M. and Aglieri, Rinella G. and Agócs, András and Agostinelli, A. and Aguilar, Salazar S. and Ahammed, Z. and Ahmad, Masoodi A. and Ahmad, N. and Ahn, S. A. and Ahn, S. U. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alfaro, Molina R. and Alici, A. and Alkin, A. and Almaráz, Aviña E. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Lévai, Péter and Molnár, Levente and Pochybova, Sona (2013) Measurement of inelastic, single- and double-diffraction cross sections in proton-proton collisions at the LHC with ALICE. EUROPEAN PHYSICAL JOURNAL C, 73. ISSN 1434-6044

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Abstract

Measurements of cross sections of inelastic and diffractive processes in proton–proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distribu- tions: for single diffraction (diffractive mass MX < 200 GeV/c2) σSD/σINEL = 0.21 ± 0.03, 0.20+0.07 −0.08, and 0.20+0.04 −0.07, respectively at centre-of-mass energies √s = 0.9, 2.76, and 7 TeV; for double diffrac- tion (for a pseudorapidity gap ∆η > 3) σDD/σINEL = 0.11 ± 0.03, 0.12 ± 0.05, and 0.12+0.05 −0.04, re- spectively at √s = 0.9, 2.76, and 7 TeV. To measure the inelastic cross section, beam properties were determined with van der Meer scans, and, using a simulation of diffraction adjusted to data, the following values were obtained: σINEL = 62.8+2.4 −4.0(model) ± 1.2(lumi) mb at √s = 2.76 TeV and 73.2+2.0 −4.6(model) ± 2.6(lumi) mb at √s = 7 TeV. The single- and double-diffractive cross sec- tions were calculated combining relative rates of diffraction with inelastic cross sections. The results are compared to previous measurements at proton–antiproton and proton–proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models.

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