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|
Bibliographical noteFunding Information:
We thank Y. Kwon for useful discussions. The work of C.S.K. was supported in part by CHEP-SRC Program, in part by Grant No. R02-2003-000-10050-0 from BRP of the KOSEF. The work of S.O. was supported in part by Grant No. R02-2003-000-10050-0 from BRP of the KOSEF, and by the Japan Society for the Promotion of Science (JSPS). The work of C.Y. was supported by Grant No. 2001-042-D00022 of the KRF.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics