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Pulse shapes for signal reconstruction in the ATLAS Tile Calorimeter
Stockholm University, Faculty of Science, Department of Physics.
2010 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 617, no 03-jan, 96-98 p.Article in journal (Refereed) Published
Abstract [en]

The ATLAS detector will record proton-proton collisions produced in the Large Hadron Collider at center of mass energies of up to 14 TeV. Its design allows for precision measurements as well as searches for new physics. Energy measurement using the calorimeters is crucial to these efforts. Studies of the pulse shapes used for signal reconstruction in the Tile Calorimeter are presented. The shapes were measured using test beam data and found to vary slightly with signal size. The impact of this variation on the reconstructed energy has been determined using a toy Monte Carlo.

Place, publisher, year, edition, pages
2010. Vol. 617, no 03-jan, 96-98 p.
Keyword [en]
ATLAS, Calorimeter, Test beam, Pulse shape
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-68183DOI: 10.1016/j.nima.2009.09.114ISI: 000279258700026OAI: oai:DiVA.org:su-68183DiVA: diva2:472177
Note
authorCount :2Available from: 2012-01-03 Created: 2012-01-03 Last updated: 2017-12-08Bibliographically 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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