TY  - JOUR
AU  - Li, X. Q.
AU  - Su, F.
AU  - Yang, Y. D.
PY  - 2011
DA  - 2011//
TI  - Determination of the strong coupling gB*B pi from semileptonic B -> pi l nu decay
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 054019
EP  - 8pp
VL  - 83
IS  - 5
PB  - Amer Physical Soc
AB  - According to heavy-meson chiral perturbation theory, the vector form factor f+(q(2)) of exclusive semileptonic decay B -> pi l nu is closely related, at least in the soft-pion region ( i.e., q(2) similar to (m(B) – m(pi))(2)), to the strong coupling g(B*B pi) or the normalized coupling (g)over-cap. Combining the precisely measured q2 spectrum of B -> pi l nu decay by the BABAR and Belle collaborations with several parametrizations of the form factor f +(q(2)), we can extract these couplings from the residue of the form factor at the B* pole, which relies on an extrapolation of the form factor from the semileptonic region to the unphysical point q(2) = m(B*)(2). Comparing the extracted values with the other experimental and theoretical estimates, we can test these various form-factor parametrizations, which differ from each other by the amount of physical information embedded in. It is found that the extracted values based on the Becirevic-Kaidalov, Ball-Zwicky and Bourrely-Caprini-Lellouch parametrizations are consistent with each other and roughly in agreement with the other theoretical and lattice estimates, while the Boyd-Grinstein-Lebed ansatz, featured by a spurious, unwanted pole at the threshold of the cut, gives a neatly larger value.
SN  - 1550-7998
UR  - http://arxiv.org/abs/arXiv:1011.0269
UR  - https://doi.org/10.1103/PhysRevD.83.054019
DO  - 10.1103/PhysRevD.83.054019
LA  - English
N1  - ISI:000288244700003
ID  - Li_etal2011
ER  -