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20 papers · 2 filters
Lifetime difference of mesons - Theory status
Martin Beneke, Alexander Lenz
We give an update on the lifetime difference of mesons which accounts for recent lattice bag parameter results, and obtain . We then review…
Fourth generation effects in the decay
Yusuf Dincer
If the fourth generation fermions exist, the new quarks could influence the branching ratio of the decay . We obtain two solutions of the fourth generation CKM fa…
Large Effects of CP- and T-Violation in K^0 Decay
L. M. Sehgal
The epsilon-impurity of the K_L wave-function gives rise to a huge CP-violating effect in the decay K_L -> pi^+ pi^- gamma which is hidden in the polarization state (Stokes vector)…
A Renormalization Group Improved Calculation of Top Quark Production near Threshold
A. H. Hoang, A. V. Manohar, I. W. Stewart +1
The top quark cross section close to threshold in annihilation is computed including the summation of logarithms of the velocity at next-to-next-to-leading-logarithmic ord…
Skewed Parton Distributions and F_2^D at beta -> 1
A. Hebecker, T. Teubner
We show that the diffractive structure function is perturbatively calculable in the domain where the diffractive mass is small but still outside the resonance region. In this domai…
Renormalons and Power Corrections
M. Beneke, V. M. Braun
Even for short-distance dominated observables the QCD perturbation expansion is never complete. The divergence of the expansion through infrared renormalons provides formal evidenc…