2026-09-19T22:34:18Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/447962022-01-13T07:54:41Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Christoph M. E. Paus.
Ilten, Philip James
Massachusetts Institute of Technology. Dept. of Physics.
Massachusetts Institute of Technology. Department of Physics
2009-03-16T19:44:15Z
2009-03-16T19:44:15Z
2008
2008
http://hdl.handle.net/1721.1/44796
300314662
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
Includes bibliographical references (p. 49-50).
In this thesis I explore the identification of [tau] leptons from simulated reconstructed data that will be collected by the Compact Muon Solenoid (CMS) detector on the Large Hadron Collider (LHC) at CERN. The two components of particle identification, efficiencies of [tau] identification from generator level information, along with fake rates of the current default algorithm have been determined and analyzed for a photon plus jets background sample and QCD background sample. I propose a new [tau] lepton identification algorithm that employs a signal cone parametrized with respect to the 7 transverse energy, and an isolation cone parametrized with respect to charged particle density surrounding the [tau] jet. Using the default algorithm an efficiency of 27.7% is achieved along with a photon plus jets fake rate of 1.96%. Using the proposed algorithm and matching the efficiency of the default algorithm, an efficiency of 26.9% and a fake rate of 0.44% is achieved. Approximately matching fake rates, an efficiency of 37.4% is achieved with a fake rate of 2.36%.
by by Philip James Ilten.
S.B.
50 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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http://dspace.mit.edu/handle/1721.1/7582
Physics.
Large Hadron Collider (France and Switzerland)
A study of tau identification with the CMS detector at the LHC
Thesis
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