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# Diffractive dijet production in √s = 7 TeV pp collisions at the ATLAS Experiment

Bansil, Hardeep Singh (2014)
Ph.D. thesis, University of Birmingham.

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## Abstract

A data sample of pp collisions with an integrated luminosity of 6.75 nb$$^{-1}$$ was collected using a combination of a minimum bias trigger and a single jet trigger at √s = 7 TeV using the ATLAS detector at the Large Hadron Collider. It is analysed to study diffractive dijet production, i.e. events with a hadronic system containing at least two jets in addition to a large region of pseudorapidity devoid of hadronic activity. The cross section is presented differentially with respect to Δη$$^F$$, the largest continuous region of pseudorapidity which extends from the edge of the detector at η = ±4.9 and contains no final state particles above threshold momentum cuts, over the region 0 < Δη$$^F$$ < 6.5. It is also presented differentially in the variable ξ$$^±$$, which estimates the fractional momentum loss of the proton in single diffractive dissociation (pp → pX) events. Comparing the data distributions with a Monte Carlo model suggest that fluctuations in the hadronisation process allow non-diffractive dijets to look like diffractive events, but that the data cannot be described solely by non-diffractive dijet production. In addition, the monitoring of the electromagnetic and jet efficiencies for the ATLAS Level-1 Calorimeter Trigger is described.

Type of Work: Ph.D. thesis. Newman, Paul and Bracinik, Juraj Colleges (2008 onwards) > College of Engineering & Physical Sciences Particle Physics Group, School of Physics and Astronomy QC Physics University of Birmingham 4814
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