B-→π-π0/ρ-ρ0 to next-to-next-to-leading order in QCD factorization

Journal article

The approximate tree decays B-→π-π0/ρ-ρ0 may serve as benchmark channels for testing the various theoretical descriptions of the strong interaction dynamics in hadronic B meson decays. The ratios of hadronic and differential semileptonic B→πℓν/ρℓν decay rates at maximum recoil provide particularly clean probes of the QCD dynamics. We confront the recent next-to-next-to-leading order calculation in the QCD factorization framework with experimental data and find support for the factorization assumption. A detailed analysis of all tree-dominated B→ππ/πρ/ρρ decay modes seems to favor somewhat enhanced color-suppressed amplitudes, which may be accommodated in QCD factorization by a small value of the first inverse moment of the B meson light-cone distribution amplitude, λB□250MeV. Precise measurements of the semileptonic B→ρℓν spectrum could help to clarify this point. © 2009 The American Physical Society.

Authors: Bell, G; Pilipp, V

• Journal: Physical Review D
• Volume: 80
• Issue: 5
• Publication date: 2009-09-25
• DOI: 10.1103/PhysRevD.80.054024
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English