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31 papers · 1 filter
B- -> pi- pi0/rho- rho0 to NNLO in QCD factorization
Guido Bell, Volker Pilipp
The approximate tree decays B- -> pi- pi0/rho- rho0 may serve as benchmark channels for testing the various theoretical descriptions of the strong interaction dynamics in hadronic…
Dispersive representation and shape of the Kl3 form factors: robustness
Veronique Bernard, Micaela Oertel, Emilie Passemar +1
An accurate low-energy dispersive parametrization of the scalar Kpi form factor was constructed some time ago in terms of a single parameter guided by the Callan-Treiman low-energy…
Integrating out strange quarks in ChPT: terms at order p^6
Juerg Gasser, Christoph Haefeli, Mikhail A. Ivanov +1
Chiral perturbation theory in the two-flavour sector allows one to analyse Green functions in QCD in a limit where the strange quark mass is considered to be large in comparison to…
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…