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11 papers · 2 filters
Recent developments in the physics of light quarks
H. Leutwyler
My talk was dedicated to the memory of Jan Stern. The brief account given below focuses on the progress achieved in the determination of the S-wave scattering lengths, both ex…
Isospin breaking in Kl4 decays
Gilberto Colangelo, Juerg Gasser, Akaki Rusetsky
Data on Ke4 decays allow one to extract experimental information on the elastic pi pi scattering amplitude near threshold, and to confront the outcome of the analysis with predicti…
NNLO corrections to B --> X_u l nu in the shape-function region
H. M. Asatrian, C. Greub, B. D. Pecjak
The inclusive decay B --> X_u l nu is of much interest because of its potential to constrain the CKM element |V_ub|. Experimental cuts required to suppress charm background restric…
On concise hypotheses for the interpretation of a wide scalar resonance as gauge boson binary in QCD - some new analyses
Peter Minkowski
This work aims to give some answers to questions raised at QCD2008 in Montpellier, July 2008.
Analytic calculation of two-loop QCD corrections to b\to s\ell^+\ell^- in the high q^2 region
Christoph Greub, Volker Pilipp, Christof Schüpbach
We present our results for the NNLL virtual corrections to the matrix elements of the operators O_1 and O_2 for the inclusive process b\to s\ell^+\ell^- in the kinematical region q…
On the low energy end of the QCD spectrum
H. Leutwyler
The energy gap of QCD is now understood very well. There is no doubt that the expansion in powers of the two lightest quark masses does represent a very useful tool for the analysi…