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

Bansil, Hardeep Singh (2014). Diffractive dijet production in √s = 7 TeV pp collisions at the ATLAS Experiment. University of Birmingham. Ph.D.

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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.