Measurements made using the ATLAS detector at the LHC at √s = 7 TeV incorporating diffractive processes are presented. A first measurement of the inelastic cross-section using 20 μb-1 of data is given, yielding a result of σinel(ξ>5×10-6) = 60.3±2.1 mb, for single (pp → Xp) and double (pp → Xp) diffractive processes for a kinematic range corresponding to detector acceptance ξ = M2X/s calculated from the invariant mass MX of the heavier dissociation system X. Furthermore a study is made of pseudorapidity gap distributions using 7.1 ± 0.2 μb-1 of data collected to tune the diffractive fraction of the inelastic cross-section in Monte Carlo (MC) models, and a measurement is made of the differential cross-section for events with large gaps in pseudorapidity where diffractive processes dominate.
19th Particles and Nuclei International Conference (PANIC11)
- Pub Date:
- September 2012
- High Energy Physics - Experiment
- 3 pages, 4 figures, presented at The 19th Particles and Nuclei International Conference, MIT, MA, USA, 24 - 29 Jul 2011