2006/09/30 by Yeo-Yie Charng, T. Kurimoto, Hsiang-nan Li · 5 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.74.074024
published as Phys.Rev.D74:074024,2006; Phys.Rev.D78:059901,2008 · 13 pages, 9 figures, a missing overall coefficient was included into the gluonic contribution. The numerical results were revised accordingly
openalex publication_date 2006/10/31 · arxiv created 2007/01/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We calculate the flavor-singlet contribution to the B\ensuremath→\ensuremathη^(\ensuremath') transition form factors from the gluonic content of the \ensuremathη^(\ensuremath') meson in the large-recoil region using the perturbative QCD approach. The formulation for the \ensuremathη\mathrm\text\ensuremath-\ensuremathη^\ensuremath' mixing in the quark-flavor and singlet-octet schemes is compared, and employed to determine the chiral enhancement scales associated with the two-parton twist-3 \ensuremathη^(\ensuremath') meson distribution amplitudes. It is found that the gluonic contribution is negligible (around 5%) in the B\ensuremath→\ensuremathη form factors, but reaches 10%--40% in the B\ensuremath→\ensuremathη^\ensuremath' ones. Its impact on the accommodation of the measured B\ensuremath→\ensuremathη^(\ensuremath')K branching ratios in the perturbative QCD and QCD-improved factorization approaches is elaborated.