Timelike-helicity y B → ππ form factor from light-cone sum rules with dipion distribution amplitudes
Author(s)
Cheng, Shan; Khodjamirian, Alexander; Virto, Javier
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We complete the set of QCD light-cone sum rules for B→ππ transition form factors, deriving a new sum rule for the timelike-helicity form factor F[subscript t] in terms of dipion distribution amplitudes. This sum rule, in the leading twist-two approximation, is directly related to the pion vector form factor. Employing a relation between F[subscript t] and other B→ππ form factors, we obtain also the longitudinal-helicity form factor F[subscript 0]. In this way, all four (axial-)vector B→ππ form factors are predicted from light-cone sum rules with dipion distribution amplitudes. These results are valid for small dipion masses with large momentum.
Date issued
2017-09Department
Massachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review D
Publisher
American Physical Society
Citation
Cheng, Shan, et al. “Timelike-Helicity B → π π Form Factor from Light-Cone Sum Rules with Dipion Distribution Amplitudes.” Physical Review D, vol. 96, no. 5, Sept. 2017. © 2017 American Physical Society
Version: Final published version
ISSN
2470-0010
2470-0029