Two loop virtual corrections to $$b\rightarrow (d,s)\ell ^+\ell ^-$$ b → ( d , s ) ℓ + ℓ - and $$c\rightarrow u\ell ^+\ell ^-$$ c → u ℓ + ℓ - for arbitrary momentum transfer

Calculation of two - loop virtual corrections to b → s l + l − in the standard model ∗

T L  C S C T F  O U L: E F P L  L D

A natural liberalization of Datalog is used in the Distributed Knowledge Authorization Language (DKAL). We show that the expressive power of this liberal Datalog is that of existential fixed-point logic. The exposition is self-contained.

Results of the O ( α s ) two - loop virtual corrections to B → X s l + l − in the standard model

We present the results of the O(αs) two-loop virtual corrections to the differential decay width dΓ(B → Xsll)/dŝ, where ŝ is the invariant mass squared of the lepton pair, normalized to m b . Those contributions from gluon bremsstrahlung which are needed to cancel infrared and collinear singularities are also included. Our calculation is restricted to the range 0.05 ≤ ŝ ≤ 0.25 where the effects...

QCD Corrections to the Decay B → X s l + l −

We briefly discuss the status of the NNLL QCD calculations in the inclusive rare B decay B → Xsll. Two important ingredients, the two-loop matrix elements of the four quark operator O2 and the bremsstrahlung contributions, were quite recently finalised. The new contributions significantly improve the sensitivity of the inclusive decay B → Xsll decay in testing extensions of the standard model i...

T L  C S C B  C

In a computational process, certain entities (for example sets or arrays) and operations on them may be automatically available, for example by being provided by the programming language. We define background classes to formalize this idea, and we study some of their basic properties. The present notion of background class is more general than the one we introduced in an earlier paper, and it t...