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Fake Isolated Muon Background in Searches for Supersymmetry with two Muons in the Final State
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
Show others and affiliations
2010 (English)Report (Other academic)
Abstract [en]

We study a data-driven technique to derive the contamination from fake isolated muons in a search for supersymmetric (SUSY) particles, in final states with two high pT muons. The signal sample is characterized by jets, missing transverse energy and two high pT muons, isolated from calorimeter energy. In real data, a fraction of the selected events will arise from processes where at least one of the isolated muons is not truly isolated, but rather arises in conjunction with a jet. We illustrate how to determine the contribution from fake isolated muons, to the signal sample. The method is demonstrated with a simple SUSY analysis of the di-muon sample. We study a range of potential systematic effects arising from the extrapolation from the control sample to the signal region.

Place, publisher, year, edition, pages
2010. , 34 p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-108052OAI: oai:DiVA.org:su-108052DiVA: diva2:753397
Note

Technical report from the  ATLAS experiment

Available from: 2014-10-07 Created: 2014-10-07 Last updated: 2014-10-09Bibliographically approved
In thesis
1. Search for Weakly Produced Supersymmetric Particles in the ATLAS Experiment
Open this publication in new window or tab >>Search for Weakly Produced Supersymmetric Particles in the ATLAS Experiment
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Large Hadron Collider located at CERN is currently the most powerful particle accelerator and ATLAS is an experiment designed to exploit the high energy proton-proton collisions provided by the LHC. It opens a unique window to search for new physics at very high energy, such as supersymmetry, a postulated symmetry between fermions and bosons.

Supersymmetry can provide a solution to the hierarchy problem and a candidate for Dark Matter. It also predicts the existence of new particles with masses around 1 TeV, thus reachable with the LHC. This thesis presents a new search for supersymmetry in a previously unexplored search channel, namely the production of charginos and neutralinos directly decaying to electroweak on-shell gauge bosons, with two leptons, jets, and missing transverse momentum in the final state. The search is performed with proton-proton collision data at a center of mass energy of √s = 8 TeV recorded with the ATLAS experiment in 2012. The design of a signal region sensitive to the new signal is presented and a data driven technique to estimate the Z+jets background is developed.

Precise measurements of hadronic jet energies are crucial to search for new physics with ATLAS. A precise energy measurement of hadronic jets requires detailed knowledge of the pulse-shapes from the hadron calorimeter signals. Performance of the ATLAS Tile Calorimeter in this respect is presented using both pion test-beams and proton–proton collision data.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2014. 124 p.
Keyword
ATLAS, ATLAS experiment, supersymmetry, chargino, neutralino, physics analysis, LHC, Large Hadron Collider
National Category
Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-108060 (URN)978-91-7447-992-8 (ISBN)
Public defence
2014-11-14, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2 and Paper 4: Technical report from the  ATLAS experiment.

Available from: 2014-10-23 Created: 2014-10-08 Last updated: 2015-09-23Bibliographically approved

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