2017 Impact factor 5.172
Particles and Fields
Eur. Phys. J. C 28, 515-523 (2003)
DOI: 10.1140/epjc/s2003-01199-y

B to light meson transition form factors calculated in perturbative QCD approach

C.-D. Lü and M.-Z. Yang

CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China and Institute of High Energy Physics, P.O. Box 918(4), Beijing 100039, P.R. China

(Received: 27 December 2002 / Published online: 5 May 2003)

We calculate the $B\to P$, $B\to V$ ( P is the light pseudoscalar meson, V the light vector meson) form factors in the large-recoil limit in the perturbative QCD approach, including both the vector (axial vector) and tensor operators. In general there are two leading components $\phi_B$ and $\bar{\phi}_B$ for the B meson wave functions. We consider both contributions of them. Sudakov effects ( $k_{\perp}$ and threshold resummation) are included to regulate the soft end-point singularity. By choosing the hard scale as the maximum virtualities of the internal particles in the hard b quark decay amplitudes, Sudakov factors can effectively suppress the long-distance soft contribution. The hard contribution can be dominant in these approaches.

© Società Italiana di Fisica, Springer-Verlag 2003