We study semileptonic decays B→η(′)lν, taking into account the flavor-singlet contribution (Fsinglet+) to the B→η(′) form factors, which arises from the two-gluon emission in a decaying B meson. It has been recently pointed out that, in addition to large weak annihilation effects, the unknown value of F singlet+ prevents accurate theoretical estimates in the analysis of B→η′K decays in QCD factorization. We present a certain method to determine Fsinglet+ with a reasonable accuracy, using B→η(′)lν and B→πlν decays. We also investigate the possible effect of Fsinglet + on the estimated branching ratios (BRs) for B→η (′)lν and find that the BR for B→η′lν is particularly sensitive to the effect of Fsinglet+.
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2004 Jun 24|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics