Ponente
Srta.
María Vieites Díaz
(Universidade de Santiago de Compostela)
Descripción
Within the Standard Model (SM) framework, charmless b decays proceeding via tree diagrams are suppressed by the smallness of the |Vub| term in the CKM matrix. Their contribution to the final decay rate is, therefore, of a similar order of magnitude of the otherwise sub-leading penguin process. This situation enhances the interference effects between the two processes and allows the measurement of their relative weak phase difference. The relative importance of the penguin diagrams in charmless processes could allow the detection of new particles entering in the loops which would cause deviations from the branching fractions and CP asymmetries predicted by the SM.
The LHCb detector consists of a single-arm forward spectrometer specifically designed for flavour physics. The characteristics of this design include a very good vertex and tracking resolution, a fully instrumented forward coverage that maximizes the acceptance of the bb quark pairs produced at the LHC and a very efficient particle identification (PID) system separating protons, pions and kaons in the full acceptance. Together with a high performing trigger, these vertexing and PID efficiencies are crucial in order to study flavour physics in the very complicated hadronic environment of the LHC.
In this talk the latest results on charmless b decays by the LHCb collaboration will be presented, with particular emphasis on the amplitude analysis of the B0->(pi pi)(K pi) decay. This includes the multidimensional analysis of the invariant masses and helicity angles, which allows to measure the polarisation fractions, direct CP violation and triple product asymmetries
Autor primario
Srta.
María Vieites Díaz
(Universidade de Santiago de Compostela)
