Produção de dijatos em dissociacão difrativa e produção de bósons de gauge via acoplamentos anômalos quárticos com os detectores de prótons frontais no LHC

Abstract

The Large Hadron Collider (LHC) will continue to explore possible evidences of Physics Beyond the Standard Model (BSM), searching to confirm or exclude the existence of new particles and couplings. In this thesis, the phenomenology of the anomalous quartic couplings of gauge bosons in the process γγ →WW is studied, by using a pure leptonic channel W → l±υ. The process γγ → ΖΖ , forbidden at tree level in the Standard Model, will be also studied for a final state ΖΖ → l±l∓l±l∓ . Both contributions are simulated inside of the equivalente photon approximation assuming a Budnev flux for the two photons. It is presented a study of the background consisting of the inclusive process pp → WW,ZZ, combined with pile-up events with protons in the acceptance of forward detectors installed at LHC, is presented. Background contributions from diffractive processes in the γγ →WW channel are included. The contribution from pile-up events is simulated for an average of 50 collisions per bunch crossing. The Reggeon contribution is analysed in two instances: in the dijet channel, assuming a non-negligible contribution in the Resolved-Pomeron model, and as a diffractive background for the γγ →WW process, through the double-Reggeon or mixed Pomeron and Reggeon exchanges. For the γγ → WW, ZZ channels, the number of expected events is determined for a centre-of mass energy of √s=13 TeV and an integrated luminosity of 100 fb¯¹. For the study of dijet production with a Reggeon contribution, an integrated luminosity of 1 pb¯¹ is assumed, for which the expected scenario has a small contribution from pile-up events.