Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-01
Phys.Rev.D79:114021,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 4 figures, v2: corrected typos and Eq. (25), v3: journal version
Scientific paper
10.1103/PhysRevD.79.114021
Recently, it was shown that in inclusive B -> Xs l+ l- decay, an angular decomposition provides three independent (q^2 dependent) observables. A strategy was formulated to extract all measurable Wilson coefficients in B -> Xs l+ l- from a few simple integrals of these observables in the low q^2 region. The experimental measurements in the low q^2 region require a cut on the hadronic invariant mass, which introduces a dependence on nonperturbative b quark distribution functions. The associated hadronic uncertainties could potentially limit the sensitivity of these decays to new physics. We compute the nonperturbative corrections to all three observables at leading and subleading order in the power expansion in \Lambda_QCD/m_b. We find that the subleading power corrections give sizeable corrections, of order -5% to -10% depending on the observable and the precise value of the hadronic mass cut. They cause a shift of order -0.05 GeV^2 to -0.1 GeV^2 in the zero of the forward-backward asymmetry.
Lee Keith S. M.
Tackmann Frank J.
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