242 research outputs found
The performance of the CMS Pixel Detector and the Primary Vertex Finding Author(s):
No full textThe CMS Pixel detector Layout, coverage and hit resolution are presented. Two algorithms of primary vertex finding based on tracks reconstructed with three pixel hits are described. The primary vertex reconstruction based on pixel hits is shown to be particularly suitable for the CMS High Level Trigger
Track and Vertex Reconstruction with the CMS Detector at LHC
No full textBecause of the high charged particle multiplicity expected in proton-proton collisions at the LHC experiment,track and vertex reconstructions are challenging tasks. Main track and vertex reconstruction techniques used in the CMS experiment are described in the following. Both the track and vertex reconstruction problems can be decomposed into a pattern recognition stage and an estimation of the track and vertex parameters. Main algorithms used in CMS are based on the least-squares methods, but depending on the specific application robustifications of the least-squares algorithms can be more suitable. Several robustification techniques will be described
B-tagging in CMS at LHC
No full textThis report provides a review of the main algorithms for offline inclusive b-tagging developed within the CMS community. Two b-tag algorithms, one based on the impact parameter measurement and the other based on the secondary vertices are discussed. The performance of these algorithms are presented for several jet transverse energies and pseudorapidity regions. An additional decay length based b-tag is also described and its preliminary performance is presented. (4 refs)
Searches for MSSM neutral Higgs bosons at LEP
No full textThis article describes the analysis methods and the results of the searches for the MSSM neutral Higgs bosons at LEP. The analysis strategies used on the L3 experiment are described. The analyses are carried out on 216.6 pb/sup -1/ data collected by the L3 detector at centre-of-mass energies from 200 GeV to 209 GeV. No signal is observed. Combining the analyses from the LEP experiments, preliminary lower mass limits are given as a function of the tan beta parameter. (8 refs)
Post-mastectomy radiotherapy with electrons beam and shaped bolus: results of a prospective observational study.
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