eprintid: 15171
rev_number: 11
eprint_status: archive
userid: 666
dir: disk0/00/01/51/71
datestamp: 2013-07-09 07:16:43
lastmod: 2013-07-22 07:55:05
status_changed: 2013-07-09 07:16:43
type: doctoralThesis
metadata_visibility: show
creators_name: Poddar, Sahill
title: Search for new phenomena in a mono-jet plus missing transverse energy final state with the ATLAS detector at the LHC 
subjects: ddc-530
divisions: i-130700
adv_faculty: af-13
abstract: With the commencement of the LHC, a new era in particle physics has begun. By colliding beams of protons at unprecedented energies, the LHC will provide the possibility to probe extensions to the Standard Model of particle physics. 

In the following work, a model independent search for new phenomena is conducted in a mono-jet plus missing transverse energy final state. The dataset used corresponds to an integrated luminosity of 4.7 inverse femtobarn of proton-proton collisions at a centre-of-mass energy of 7 TeV recorded by the ATLAS detector in the year 2011. Data-driven methods are developed to estimate the contribution of the largest backgrounds which comprise W/Z+jets production. No excess with respect to processes from the Standard Model is observable. Upper limits are set on the visible cross section at 95% and 90% CL using the frequentist CLs method. New phenomena with a visible cross section bigger than 6.9 (5.5) fb can be excluded at 95% (90%) CL. These limits are translated to lower (upper) limits on the ADD extra dimensions model parameter MD (R). Extra dimensions are excluded for MD values below 4.17 (2.51) TeV for n=2 (6) extra dimensions at leading order cross sections of the theory. The results are also interpreted in terms of dark matter particle candidate, WIMPs pair production scenario. 
date: 2013
id_scheme: DOI
id_number: 10.11588/heidok.00015171
ppn_swb: 1652931376
own_urn: urn:nbn:de:bsz:16-heidok-151719
date_accepted: 2013-06-18
advisor: HASH(0x561a627f7b70)
language: eng
bibsort: PODDARSAHISEARCHFORN2013
full_text_status: public
citation:   Poddar, Sahill  (2013) Search for new phenomena in a mono-jet plus missing transverse energy final state with the ATLAS detector at the LHC.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/15171/1/thesis.pdf