Browsing by Author "Khodjamirian, Alexander"
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Item Hadronic Form Factors: Combining QCD Calculations with Analyticity(2009-09-02) Khodjamirian, AlexanderItem Light-Cone Sum Rules with B-Meson Distribution Amplitudes(2012-07-31) Khodjamirian, AlexanderItem QCD effects in exclusive rare B-decays(2012-02-08) Khodjamirian, AlexanderItem QCD light-cone sum rules for B to dipion transition form factors(2016-05-13) Khodjamirian, AlexanderThe form factors of the semileptonic $B\to \pi\pi\ell\bar\nu$ decay are calculated from QCD light-cone sum rules, employing as a nonperturbative input the distribution amplitudes of dipion states. In the leading twist-2 approximation, we predict all $\bar{B}^0\to \pi^+\pi^0$ form factors in the kinematic region, where the hadronic dipion state has a small invariant mass and simultaneously a large recoil. The sum rule results reveal a suppression of the higher partial waves in the form factors and indicate that the lowest $P$-wave contribution is not saturated by the $\rho$-meson term.