Status of |Vub|, |Vcb| and their relative phase
The current status of the determinations of the CKM elements Vub and Vcb is reviewed and future prospects are discussed.
hep-ex↗
arXiv subjects
Robert V. Kowalewski
Publications and source records attributed to Robert V. Kowalewski.
Complementary Observables for the Determination of |Vub| in Inclusive Semileptonic B Decays
The determination of |Vub| from inclusive semileptonic B decays is limited by uncertainties in modelling the decay distributions in b->ulnu transitions. The largest uncertainties arise from the limited knowledge of the appropriate b quark mass and Fermi momentum to use in the parameterization of the shape function. This paper presents a new method in which these shape function parameters are constrained by the same data used to measure |Vub|. The method requires measurements of the momenta of both the charged lepton and the neutrino in semileptonic B decays. From these quantities two complementary observables can be constructed, one for discriminating between b->ulnu transitions and background and the other for constraining the shape function. Using this technique the uncertainties in |Vub| from the shape function may be significantly reduced.
hep-ex↗
Track Fit Hypothesis Testing and Kink Selection using Sequential Correlations
Deviations between the form of trajectory assumed in a fit to a set of measurements and the actual form of the trajectory can give rise to sequential correlations in the residuals from the fit. These correlations can provide a more powerful goodness-of-fit test than that based on the minimum chi-square from a least squares fit. The use of this additional information is explored in the context of several common trajectory errors (e.g. decays in flight) encountered in charged particle tracking.
hep-ex↗