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Semileptonic Hyperon Decays

We review the status of hyperon semileptonic decays. The central issue is the Vus element of the CKM matrix, where we obtain Vus = 0.2250(27). This value is of similar precision, but higher, than the one derived from K l3 , and in better agreement with the unitarity requirement, |V ud | 2 + |Vus| 2 + |V ub | 2 = 1. We find that the Cabibbo model gives an excellent fit of the existing form facto...

the search for the self in becketts theatre: waiting for godot and endgame

this thesis is based upon the works of samuel beckett. one of the greatest writers of contemporary literature. here, i have tried to focus on one of the main themes in becketts works: the search for the real "me" or the real self, which is not only a problem to be solved for beckett man but also for each of us. i have tried to show becketts techniques in approaching this unattainable goal, base...

Vus Determination from Hyperon Semileptonic Decays

We analyze the numerical determination of the quark mixing factor Vus from hyperon semileptonic decays. The discrepancies between the results obtained in two previous studies are clarified. Our fits indicate sizeable SU(3) breaking corrections, which unfortunately can only be fully determined from the data at the first order. The lack of a reliable theoretical calculation of second-order symmet...

Hyperon Semileptonic Decays and Ckm Unitarity *

We perform a new numerical analysis of hyperon semileptonic decays emphasizing the systematic uncertainties. The poor understanding of SU(3) symmetry breaking effects at second order in the vector form factor translates into a large error of |Vus|. Using our determination |Vus| = 0.226 ± 0.005 together with those coming from other sources we test the unitarity of the CKM matrix.

Hyperon radiative decay.