Photonic penguins at two loops and m_t-dependence of BR[ B -> X_s l^+ l^-]

Preprint

4 October 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/9910220

Abstract

We calculate two-loop matching conditions for all the operators that are relevant to B -> X_s l^+ l^- decay in the Standard Model. In effect, we are able to remove the +_16% uncertainty in the decay spectrum, which was mainly due to the renormalization-scale dependence of the top-quark mass. We find 1.46 * 10^-6 for the branching ratio integrated in the domain 0.05 < m_{l^+l^-}^2/m_b^2 < 0.25, for l= e or mu. There remains around 13% perturbative uncertainty in this quantity, while the non-perturbative effects are expected to be smaller.

Keywords

PHOTONIC PENGUINS
SCALE DEPENDENCE
M_T DEPENDENCE
STANDARD MODEL
UNCERTAINTY
TWO LOOPS
X_S

All Related Versions

Version 1, 1999-10-04, ArXiv
Published version: Nuclear Physics B, 574 (1-2), 291.

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