Duplančić, Goran; Khodjamirian, A.; Mannel, Th.; Melić, Blaženka; Offen, N
(2008)
Lightcone sum rules for B >pi form factors revisited.
Journal of High Energy Physics
(4).
014101434.
ISSN 10298479
Abstract
We reconsider and update the QCD lightcone sum rules for B >pi form factors. The gluon radiative corrections to the twist2 and twist3 terms in the correlation functions are calculated. The (MS) over bar bquark mass is employed, instead of the oneloop pole mass used in the previous analyses. The lightcone sum rule for f(B pi)(+)(q(2)) is fitted to the measured q(2)distribution in B >pi l nu(l), fixing the input parameters with the largest uncertainty: the Gegenbauer moments of the pion distribution amplitude. For the B >pi vector form factor at zero momentum transfer we predict f(B pi)(+)(0)=0.26(0.030)(+0.04). Combining it with the value of the product vertical bar V(ub)f(B pi)(+)(0)vertical bar extracted from experiment, we obtain vertical bar Vub vertical bar=(3.5 +/ 0.4 +/ 0.2 +/ 0.1)x10(3). In addition, the scalar and penguin B >pi form factors f(B pi)(0)(q(2)) and f(B pi)(T)(q(2)) are calculated.
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