The Light-Front Model for Exclusive Semileptonic B- and D-decays
N. B. Demchuk, P. Yu. Kulikov, I. M. Narodetskii, Patrick J. O'Donnell
Abstract
An explicit relativistic light-front quark model is presented which gives the momentum transfer dependent form factors of weak hadronic currents among heavy pseudoscalar and vector mesons in the whole accessible kinematic region
0≤
q
2
≤
q
2
max
. For the numerical investigations of the
B→
D
∗
l
ν
l
,
B→ρl
ν
l
,
D→
K
∗
l
ν
l
and
D→ρl
ν
l
semileptonic decays the equal time wave functions corresponding to the updated version of the ISGW model are adopted. Using the available experimental information on branching fractions
BR(B→
D
∗
l
ν
l
)
and
BR(B→ρl
ν
l
)
the CKM parameters
V
cb
and
V
ub
were estimated:
|
V
cb
|=0.036±0.004
,
|
V
ub
|=0.0033±0.0004
. The model is further tested by comparison with experimental data, QCD sum rules and lattice calculations.