Title: Study of diffractive processes at the ATLAS Experiment Author: Vlastimil Kůs Department: Institute of Particle and Nuclear Physics Supervisor: Mgr. Marek Taševský, Ph.D. Institute of Physics of the Academy of Sciences of the CR, v.v.i. Abstract: A data sample of pp collisions corresponding to an integrated lumi- nosity of 6.75 nb−1 was collected at √ s = 7 TeV using the ATLAS detector at the Large Hadron Collider. Collision events with at least two jets with pT > 20 GeV are used to measure the differential cross section of the diffractive dijet production as a function of the rapidity gap size ∆ηF , the largest forward region extending from |η| = 4.8 devoid of particle activity above threshold momentum cuts, and an estimator of the fractional momentum loss of the scattered proton assuming the single diffractive dissociation (pp → pX), ˜ξ± . Comparisons with various Monte Carlo models reveal that though the region of small ˜ξ± and large rapidity gaps is dominated by diffraction, a contribution form non-diffractive events cannot be neglected. The rapidity gap survival probability is estimated based on data to Monte Carlo comparisons in the −3.2 < log10 ˜ξ± < −2.5 region of the ˜ξ± distri- bution with the ∆ηF > 2 requirement. 1
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:333795 |
| Date | January 2015 |
| Creators | Kůs, Vlastimil |
| Contributors | Taševský, Marek, Royon, Christophe, Valkárová, Alice |
| Source Sets | Czech ETDs |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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