Searching for New Physics in b s + Transitions at the LHCb Experiment

This thesis presents two analyses of semileptonic b → sl+l- decays using Flavour Changing Neutral Currents (FCNCs) to test for the presence of new physics and lepton flavour universality, and the equality of couplings for different leptons, which on the basis of experimental evidence is assumed to hold in the Standard Model, free from uncertainties as a result of knowledge of the hadronic matrix elements. It also includes the angular analysis of Lambda_b->Lambda mumu decay and the RK* measurement, both of which are first measurements, not yet performed by any other experiment.

Aceasta teza prezinta doua analize ale b → sl + l- semileptonice se descompune utilizand curentii neutri de schimbare a gustului (FCNC) pentru a testa prezenta noii fizici si universalitatea aromei de lepton si egalitatea cuplajelor pentru diferiti leptoni, care pe baza experimentului se presupune ca exista dovezi in modelul standard, fara incertitudini, ca rezultat al cunoasterii elementelor matricei hadronice.