NNLL QCD Corrections to the Decay $B \to X_s \ell^+ \ell^-$

Details NNLL QCD Corrections to the Decay $B \to X_s \ell^+ \ell^-$ NNLL QCD Corrections to the Decay $B \to X_s \ell^+ \ell^-$

2002-11-13

arxiv.org/abs/hep-ph/0211197v2

Nucl.Phys.Proc.Suppl. 116 (2003) 284-288

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, latex, 5 figures, references added

Scientific paper

10.1016/S0920-5632(03)80185-8

We briefly discuss the status of the NNLL QCD calculations in the inclusive rare B decay $B \to X_s \ell^+ \ell^-$. Two important ingredients, the two-loop matrix elements of the four quark operator ${\cal O}_2$ and the bremsstrahlung contributions, were quite recently finalised. The new contributions significantly improve the sensitivity of the inclusive decay $B \to X_s l^+ l^-$ decay in testing extensions of the standard model in the sector of flavour dynamics; for instance the two-loop calculation cuts the low- scale uncertainty in half and the bremsstrahlung calculation leads to a 10% shift of the position of the zero of the forward- backward asymmetry.

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