In this thesis work the search for a new heavy charged gauge boson, with 1.13 inverse femtobarn of data collected in 2011 with the CMS detector at the LHC, is performed accordingly to the Reference Model by Altarelli. The Model is a generalization of the Left-Right-Symmetric Model where the gauge group of the Standard Model of elementary particles is enlarged in order to restore the Lagrangian left-right symmetry. As a consequence new heavy gauge bosons, W′ and Z′, come out as heavy partners of the Standard Model W and Z bosons. The W′ particle is searched for in the decay channel W′ → eν. The electromagnetic calorimeter of CMS plays a central role in the analysis and its performances are discussed in detail together with methods to calibrate and monitor its response. Since no excess with respect to the Standard Model background prediction were observed in the analyzed dataset, an upper limit on the W′ production cross section times branching fraction is set. The analysis result can be translated into a lower limit on the mass of the potential W′ of 2.15 TeV/c² at 95% CL.
(2012). Search for a heavy gauge boson w' in the final state with electron and large missing energy in p-p collisions at sqrt(s) = 7 TeV. (Tesi di dottorato, Università degli Studi di Milano-Bicocca, 2012).
Search for a heavy gauge boson w' in the final state with electron and large missing energy in p-p collisions at sqrt(s) = 7 TeV
DE GUIO, FEDERICO
2012
Abstract
In this thesis work the search for a new heavy charged gauge boson, with 1.13 inverse femtobarn of data collected in 2011 with the CMS detector at the LHC, is performed accordingly to the Reference Model by Altarelli. The Model is a generalization of the Left-Right-Symmetric Model where the gauge group of the Standard Model of elementary particles is enlarged in order to restore the Lagrangian left-right symmetry. As a consequence new heavy gauge bosons, W′ and Z′, come out as heavy partners of the Standard Model W and Z bosons. The W′ particle is searched for in the decay channel W′ → eν. The electromagnetic calorimeter of CMS plays a central role in the analysis and its performances are discussed in detail together with methods to calibrate and monitor its response. Since no excess with respect to the Standard Model background prediction were observed in the analyzed dataset, an upper limit on the W′ production cross section times branching fraction is set. The analysis result can be translated into a lower limit on the mass of the potential W′ of 2.15 TeV/c² at 95% CL.File | Dimensione | Formato | |
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Phd_unimib_048574.pdf
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