1. Introduction --------------- All results and input files are available at http://www.slac.stanford.edu/xorg/hfag/semi/summer03-eps/summer03.shtml In the following (in no particular order), the updates for EPS 2003 with respect to PDG 2003 and the winter conferences 2003 are discussed. As usual, most of the error breakdowns can be found in http://www.slac.stanford.edu/xorg/hfag/semi/summer03-eps/summer03.xls and http://www.slac.stanford.edu/xorg/hfag/semi/summer03-eps/summer03.gnumeric spreadsheets. 2. Changes to common parameters ------------------------------- We use the input parameters for mixing and lifetimes from the PDG 2003 update. 3. Changes to averages ---------------------- o Inclusive semileptonic branching fraction: New lepton(?) tagged result from CLEO supercedes the published analysis from 1996. Preliminary error breakdown (does not quite add up to the published systematic, therefore the "HFAG" systematic error of 0.30 is a bit lower than CLEO's 0.33). The reference for the error breakdown for this result is M. Artuso, private communication. The reference for the error breakdown for Belle's BRECO result is T. Iijima, private communication. o In the correction for f+/f0 a mistake had occurred in the previous average: The same relative error as for the BF was used; this is overestimating the error by a factor of two as |Vcb|*F(1) is the sqrt of the BF. This bug was detected and verified while working on the inclusion of the BABAR result into the average (which is not yet contained in the EPS update). This bug is corrected in this update. The resulting change in the central value of the average is small (1/5 of the quoted error). The confidence level changes from 5.6% to 2.9%. A remark to the plot: The ellipses show the \Delta(\chi^2) = 1 contours. This is noted on the plot. The central values and errors correspond to the scaled values that go into the average. The plot is therefore a representation of the (input to the) average. It is not intended to show the published results. A discussion within HFAG has started as to whether we shall increase the errors of the experiments by a similar procedure described in PDG 2002. No conclusion has been reached, and in the meantime the chi^2/dof and the CL are stated on the plots, so everybody can form their own impression. o The same correction of the error on |Vcb|*G(1) from f+/f0 as above has been corrected. Virtually no effect here, as it is negligible compared to the other errors. o New result from BELLE on charmless semileptonic B decays in the form of an endpoint analysis. Included in summary plot, but not averaged (since nothing in b->ulnu is yet averaged). 4. Conclusion ------------- Your critical comments will be much appreciated. Please send them to