Extracting short distance information from b -> s l+ l- effectively

Details Extracting short distance information from b -> s l+ l- effectively Extracting short distance information from b -> s l+ l- effectively

2006-12-13

arxiv.org/abs/hep-ph/0612156v3

Phys.Rev.D75:034016,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 3 figures, v2: minor improvements in text, references added, v3: journal version

Scientific paper

10.1103/PhysRevD.75.034016

We point out that in inclusive B -> Xs l+ l- decay an angular decomposition provides a third (q^2 dependent) observable sensitive to a different combination of Wilson coefficients than the rate and the forward-backward asymmetry. Since a precise measurement of q^2 dependence requires large data sets, it is important to consider the data integrated over regions of q^2. We develop a strategy to extract all measurable Wilson coefficients in B -> Xs l+ l- from a few simple integrated rates in the low q^2 region. A similar decomposition in B -> K* l+ l-, together with the B -> K* \gamma rate, also provides a determination of the Wilson coefficients, without reliance on form factor models and without having to measure the zero of the forward-backward asymmetry.

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