Timelike-helicity B→ππ form factor from light-cone sum rules with dipion distribution amplitudes

@article{Cheng2017TimelikehelicityBF,
  title={Timelike-helicity B→$\pi$$\pi$ form factor from light-cone sum rules with dipion distribution amplitudes},
  author={Shan Cheng and Alexander Khodjamirian and Javier Virto},
  journal={Physical Review D},
  year={2017},
  volume={96}
}
We complete the set of QCD light-cone sum rules for $B\to \pi\pi$ transition form factors, deriving a new sum rule for the timelike-helicity form factor $F_t$ in terms of dipion distribution amplitudes. This sum rule, in the leading twist-2 approximation, is directly related to the pion vector form factor. Employing a relation between $F_t$ and other $B\to \pi\pi$ form factors we obtain also the longitudinal-helicity form factor $F_0$. In this way, all four (axial-)vector $B\to \pi\pi$ form… 

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