The Library
Jets and their substructure at the ATLAS detector : new tools for new physics
Tools
Tools
Tools
Ennis, Joseph Stanford (2017) Jets and their substructure at the ATLAS detector : new tools for new physics. PhD thesis, University of Warwick.
|
PDF
WRAP_Theses_Ennis_2017.pdf - Submitted Version - Requires a PDF viewer. Download (15Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b3157868~S1
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: |
|
||||
| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Extent: | xxv, 224 leaves : charts, illustrations. | ||||
| Language: | eng |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
