A study of the detection of quark top at LHC

Author(s)

Cedrick Miranda Mello

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
• Defense date: 2012-06-25

Examining board members

Gustavo Alberto Burdman; Fernando Silveira Navarra; Sergio Ferraz Novaes

• Advisor: Oscar Jose Pinto Eboli

Abstract

This study was to examine the possibility of verifying the violation of flavor in neutral currents mediated by Kaluza-Klein gluons (GKK), in which it was introduced by compact warped extra dimensions. The possibility of violation of flavors in neutral currents occurs through processes like proton/proton into quark top/ antiquark charm. Initially we studied the behavior of jets with high transverse momentum (the order of 300 GeV) and its substructures. After this, we studied the detection of the top quark via HEPTopTagger and Johns Hopkins algorithms (we did a brief comparison between them). Finally, we proposed two ways to find the GKK. One of them, by searching for only quark top. The other, by looking for a quark top and a jet without substructure (algorithm of TJ type). We could see that the possibility of encountering the phenomenon of violation of flavors is accessible (the ratio S/B is the order of 0.1) in both cases of mass analyzed by TJ type algorithm. (AU)

• FAPESP's process: 10/03714-6 - Detection of energetic top quarks at the LHC
• Grantee: Cedrick Miranda Mello
• Support Opportunities: Scholarships in Brazil - Master