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16 papers · 2 filters
An estimate of the B-->K*gamma form factor
Damir Becirevic, Vittorio Lubicz, Federico Mescia
We present the results of a lattice QCD calculation of the form factor relevant to B-->K*gamma decay. Our final value, T(0) = 0.24 +/- 0.03(+0.04/-0.01), is obtained in the quenche…
How to preserve symmetries with cut-off regularized integrals?
T. Varin, D. Davesne, M. Oertel +1
We present a prescription to calculate the quadratic and logarithmic divergent parts of several integrals employing a cutoff in a coherent way, i.e. in total agreement with symmetr…
Chiral Dynamics beyond the Standard Model
Jan Stern
The SM Lagrangian without physical scalars is rewritten as the LO of a Low-Energy Effective Theory invariant under a higher non linear symmetry S_{nat} \supset SU(2)_W \times U(1)_…
Resolving the A_{FB}^b puzzle in an extra dimensional model with an extended gauge structure
Abdelhak Djouadi, Gregory Moreau, Francois Richard
It is notorious that, contrary to all other precision electroweak data, the forward-backward asymmetry for b quarks measured in Z decays at LEP1 is nearly three standard…
Effective Theory Description of Weak Annihilation in B-> Xu l nu Decays
J. J. Sanz-Cillero
The semileptonic B-> Xu l nu decays allow a pretty clean determination of the CKM matrix element |Vub|. Nevertheless, the presence of weak-annihilation effects near the end-point o…
The K^*_0(800) scalar resonance from Roy-Steiner representations of pi K scattering
S. Descotes-Genon, B. Moussallam
We discuss the existence of the light scalar meson K^*_0(800) (also called kappa) in a rigorous way, by showing the presence of a pole in the pi K --> pi K amplitude on the second…