Identification Of The Tau Leptons Decaying Hadronically And Search For Supersymmetric Particles Decaying To Tau Leptons With The Cms Detector At Lhc
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| Author | : Ludovic Houchu |
| Publisher | : |
| Total Pages | : 208 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
Cette thèse a pour sujet la recherche de particules supersymétriques se désintégrant en leptons tau dans l’expérience CMS auprès du collisionneur LHC. L’analyse porte sur des données simulées de collisions proton-proton à une énergie √s = 14 TeV dans le centre de masse. Le modèle supersymétrique retenu est celui mSUGRA. Les événements d’intérêt contiennent au moins deux leptons tau, une grande énergie transverse manquante et au moins deux jets hadroniques de grandes impulsions issus de la fragmentation d’un quark. Dans un échantillon test de données, des processus autres que ceux du Modèle Standard sont mis en évidence. Préalablement, est effectué un travail d’identification des leptons tau dans leurs modes de désintégration hadroniques : une méthode de discrimination entre les jets hadroniques de tau et ceux issus d’un quark ou d’un gluon est introduite, utilisant des candidats photons ou pions neutres reconstruits et un test sur un rapport de pseudo-vraisemblances
| Author | : Michail Bachtis |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 161 |
| Release | : 2013-12-13 |
| Genre | : Science |
| ISBN | : 3319032577 |
The work presented in this thesis spans a wide range of experimental particle physics subjects, starting from level-1 trigger electronics to the final results of the search for Higgs boson decay and to tau lepton pairs. The thesis describes an innovative reconstruction algorithm for tau decays and details how it was instrumental in providing a measurement of Z decay to tau lepton pairs. The reliability of the analysis is fully established by this measurement before the Higgs boson decay to tau lepton pairs is considered. The work described here continues to serve as a model for analysing CMS Higgs to tau leptons measurements.
| Author | : Satyajit Jena |
| Publisher | : Springer Nature |
| Total Pages | : 1353 |
| Release | : |
| Genre | : |
| ISBN | : 9819702895 |
| Author | : Lesya Horyn |
| Publisher | : Springer Nature |
| Total Pages | : 146 |
| Release | : 2022-02-07 |
| Genre | : Science |
| ISBN | : 3030916723 |
This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).
| Author | : Bipul Bhuyan |
| Publisher | : Springer |
| Total Pages | : 653 |
| Release | : 2015-12-30 |
| Genre | : Science |
| ISBN | : 331925619X |
These proceedings gather invited and contributed talks presented at the XXI DAE-BRNS High Energy Physics Symposium, which was held at the Indian Institute of Technology Guwahati in December 2014. The contributions cover many of the most active research areas in particle physics, namely (i) Electroweak Physics; (ii) QCD and Heavy Ion Physics; (iii) Heavy Flavour Physics and CP Violation; (iv) Neutrino Physics; (v) Astro-particle Physics and Cosmology; (vi) Formal Theory; (vii) Future Colliders and New Machines; and (viii) BSM Physics: SUSY, Extra Dimensions, Composites etc. The DAE-BRNS High Energy Physics Symposium, widely considered to be one of the premiere symposiums organised in India in the field of elementary particle physics, is held every other year and supported by the Board of Research in Nuclear Sciences, Department of Atomic Energy, India. Roughly 250 physicists and researchers participated in the 21st Symposium, discussing the latest advancements in the field in 18 plenary review talks, 15 invited mini-review talks and approximately 130 contributed presentations. Bringing together the essential content, the book offers a valuable resource for both beginning and advanced researchers in the field.
| Author | : Patricia Burchat |
| Publisher | : Ann Arbor, Mich. : University Microfilms International |
| Total Pages | : 292 |
| Release | : 1986 |
| Genre | : Leptons (Nuclear physics) |
| ISBN | : |
| Author | : Ivo Nicolas Naranjo Fong |
| Publisher | : |
| Total Pages | : 308 |
| Release | : 2014 |
| Genre | : |
| ISBN | : |
| Author | : Christoph Ruwiedel |
| Publisher | : |
| Total Pages | : |
| Release | : 2010 |
| Genre | : |
| ISBN | : |
| Author | : Michail Bachtis |
| Publisher | : Springer |
| Total Pages | : 152 |
| Release | : 2013-12-30 |
| Genre | : Science |
| ISBN | : 9783319032566 |
The work presented in this thesis spans a wide range of experimental particle physics subjects, starting from level-1 trigger electronics to the final results of the search for Higgs boson decay and to tau lepton pairs. The thesis describes an innovative reconstruction algorithm for tau decays and details how it was instrumental in providing a measurement of Z decay to tau lepton pairs. The reliability of the analysis is fully established by this measurement before the Higgs boson decay to tau lepton pairs is considered. The work described here continues to serve as a model for analysing CMS Higgs to tau leptons measurements.
| Author | : Martin Johannes Schultens |
| Publisher | : |
| Total Pages | : |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
