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Jets and their substructure at the ATLAS detector : new tools for new physics

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Ennis, Joseph Stanford (2017) Jets and their substructure at the ATLAS detector : new tools for new physics. PhD thesis, University of Warwick.

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Official URL: http://webcat.warwick.ac.uk/record=b3157868~S1

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Abstract

This thesis is primarily concerned with two topics: the trigger performance and calibration of large-radius (large-R) jets at the ATLAS detector, and the presentation of a search for new high-mass particles that decay to vector bosons in the fully hadronic decay channel.

The performance of the ATLAS large-R jet trigger during 2015 was evaluated and found to be 100% efficient by 380 GeV for all large-R jets. The impact of jet substructure on this trigger was studied, and we discovered that a newly proposed set of variables, anti-subjettiness variables, could reduce trigger rates by approximately 30%, while still accepting 95% of large-R jets from heavy particles. Alongside this, a new calibration method for large-R jets is presented. A neural-network is used to perform a multivariate calibration for jet energy and mass using substructure variables. While there were no gains observed in the jet energy calibration, a 26% improvement in the jet mass resolution was found.

A search for X →V V→ qqqq, using large-R jets tagged as boosted vector bosons, was conducted using 37.6 fb -1 of data collected at √s =13 TeV by ATLAS in 2015 and 2016. No significant deviation from the Standard Model was observed and limits were placed on a variety of generic signal models. The Heavy Vector Triplet model A (B) was excluded in the mass range 1:2(1:2) < mV < 3:1(3:5) TeV, the RS graviton with k/M planck = 1 was excluded for 1:3 < mG < 1:6 TeV, and limits on σ x BR were placed on a generic scalar model.

Item Type: Thesis or Dissertation (PhD)
Subjects: Q Science > QC Physics
Library of Congress Subject Headings (LCSH): Jets (Nuclear physics), Large Hadron Collider (France and Switzerland), Bosons, Fermions
Official Date: September 2017
Dates:
DateEvent
September 2017UNSPECIFIED
Institution: University of Warwick
Theses Department: Department of Physics
Thesis Type: PhD
Publication Status: Unpublished
Extent: xxv, 224 leaves : charts, illustrations.
Language: eng

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