Busca por ressonâncias de grávitons em modelos com dimensões extras no LHC

Author(s)

Flávia de Almeida Dias

• Document type: Doctoral Thesis
• Press: São Paulo. 2014-06-11.
• Institution: Universidade Estadual Paulista (Unesp). Instituto de Física Teórica (IFT). São Paulo
• Defense date: 2012-11-23
• Advisor: Sérgio Ferraz Novaes

Abstract

A search for new exotic particles decaying to VZ was performed, where V is either aW or a Z boson decaying hadronically into two overlapping jets and the Z decays into a pair of electrons or muons. The analysis uses a data sample of proton-proton collisions corresponding to an integrated luminosity of 5 fb−1 collected by the Compact Muon Solenoid experiment at the Large Hadron Collider at a center-of-mass energy of 7 TeV in 2011. No significant excess was observed in the mass distribution of the VZ candidates compared with the background expectation from Standard Model processes. Therefore, upper limits at the 95% confidence level were set on the product of the cross section times the branching fraction of hypothetical particles decaying to theVZ final state, as a function of the mass, in two benchmark models. In the Randall-Sundrum model for graviton resonances with k/MPl= 0.05, masses between 750 and 924 GeV/c2 were excluded. Sequential Standard ModelW bosons with masses between 700 and 929 GeV/c2 were also excluded. These are the first results from the LHC onVZ searches using final states with a boosted massive jet and a lepton pair (AU)

• FAPESP's process: 08/11308-8 - Search for graviton resonances of extra dimension models at LHC
• Grantee: Flavia de Almeida Dias
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)