Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-11-28
Phys.Lett.B647:405-412,2007; Erratum-ibid.B653:450,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 2 figures. Sign convention modified for consistency with hep-ph/0401188
Scientific paper
10.1016/j.physletb.2007.02.041 1
We compute annihilation amplitudes for charmless B decays that are proportional to the three-parton twist-3 light meson distribution amplitude phi_{3M}(x1,x2) with an active gluon. Due to an enhancement from a quark propagator at the scale p^2 ~ mb\Lambda_QCD these terms occur at the same parametric order in alpha_s(mb) and 1/mb as the known leading order annihilation involving fB and twist-2 meson distributions. With our calculation the leading order annihilation amplitude is now complete. At lowest order in alpha_s the amplitudes are real and only O_{5-8} contribute. Using simple models we find that the three-parton and two-parton terms are of comparable size.
Arnesen Christian M.
Rothstein Ira Z.
Stewart Iain W.
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