Measurement of the top quark decay rate in the Ws channel in ATLAS/LHC
FCT / IDPASC call 2010
2010 / 2011
Experimental Particle Physics
Universidade de Coimbra
Laboratório de Instrumentação e Física Experimental de Partículas
The study of the top quark decay into a W boson and a s-quark, in particular the direct measurement of the top quark decay rate on this channel, will constrain the CKM mixing matrix, in an independent way of the matrix unitarity condition, with possible clues for physics beyond the Standard Model and about the existence of a fourth fermion family. The present measurement starts with the reconstruction of the top quark decay and the identification of s-quark jets, namely from the production of long lived mesons with s-quarks.\ In the present work it will be developed signal selection and background rejection algorithms. which will be used both with simulated and real data acquired by the ATLAS experiment at LHC. The work will also stress the estimation and minimization of the systematic errors associated with this measurement.
October 30, 2010