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Measurement of the ATLAS Tile Calorimeter pulse-shapes with √s = 7 TeV collision data
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
2010 (English)Report (Other academic)
Abstract [en]

The energy reconstruction of the ATLAS Tile Calorimeter requires a predefined pulse-shape function. This pulse-shape function must match the pulse-shapes in data to avoid bias in the reconstructed energy. Using 60 nb-1 of √s = 7 TeV collision data, this note investigates deviations between measured pulse-shapes and the pulse-shape used for reconstruction and the possible bias on the energy reconstruction are studied. Measured pulse-shape widths exhibit slight channel-by-channel variations of the order ±1% with respect to the width of the reference pulse-shape. This implies less than 0.5% bias on the reconstructed energy. No energy dependence of the pulse-shapes is found.

Place, publisher, year, edition, pages
2010. , 22 p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-108041OAI: oai:DiVA.org:su-108041DiVA: diva2:753347
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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