Heavy Neutral Particle Decays to Tau Pairs in Proton Collisions at the Square Root of s = 7TeV with CMS at the CERN Large Hadron Collider.
- Resource Type
- Theses
- Authors
- Bachtis, Michail
- Source
- Dissertation Abstracts International; Dissertation Abstract International; 73-08(E)B.
- Subject
- Physics, Elementary Particles and High Energy
- Language
- English
Summary: This thesis describes a study of the tau-pair final state in proton collisions at a center of mass energy of 7 TeV using the CMS Experiment at the CERN Large Hadron Collider. Tau leptons usually decay to hadrons and their efficient detection is very challenging in a hadronic environment. A novel tau reconstruction algorithm that maintains tau detection efficiency for low background rates was developed. Events were then selected from the CMS 2011 data sample in three tautau final states depending on the tau decays: mu + tauh, e + tau h, e + mu where tauh denotes a hadronic tau decay. Those events were used to measure the Z-boson production cross section where Z → tautau. A search for the Standard Model and Minimal Supersymmetric Standard Model (MSSM) Higgs bosons was also performed. No signal was observed in the Higgs search and stringent new bounds were set for the SM Higgs production and in the MSSM parameter space.