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

Abelev B., Adam J., Adamová D., Adare A., Aggarwal M., Aglieri Rinella G., ...More

European Physical Journal C, vol.73, no.6, pp.1-20, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 73 Issue: 6
  • Publication Date: 2013
  • Doi Number: 10.1140/epjc/s10052-013-2456-0
  • Journal Name: European Physical Journal C
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1-20
  • Yıldız Technical University Affiliated: No


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 distributions: for single diffraction (diffractive mass M X<200 GeV/c 2) 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 7TeV; for double diffraction (for a pseudorapidity gap Δη>3) σ DD/σ INEL=0.11±0.03,0.12±0.05, and 0.20+0.05 -0.04, respectively 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 sections 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. © 2013 CERN for the benefit of the ALICE collaboration.