After first measurements of rare flavour-changing neutral-current B-meson decays governed by b --> s + (gamma, l^+ l^-) transitions by Belle, CDF and Babar, the LHCb experiment will now reach a new level of precision measurements. Especially the first measurements of lately proposed "optimised" observables in the angular distribution of the exclusive B --> K^(*) l^+ l^- decays would provide new tests of non-standard contributions. The respecitve theoretical tools are reviewed and some results of recent model-(in)dependent analyses are presented, which test the Standard Model predictions and derive stronger constraints on nonstandard contributions.
The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..