| Vu b | and B → η(′) form factors in covariant light-front approach

Chuan Hung Chen, Yue Long Shen, Wei Wang

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17 Citations (Scopus)

Abstract

B → (π, η, η) transition form factors are investigated in the covariant light-front approach. With theoretical uncertainties, we find that B → (π, η, η) form factors at q2 = 0 are f+(π, η, η′) (0) = (0.245- 0.001+ 0.000 ± 0.011, 0.220 ± 0.009 ± 0.009, 0.180 ± 0.008- 0.007+ 0.008) for vector current and fT(π, η, η′) (0) = (0.239- 0.003 - 0.018+ 0.002 + 0.020, 0.211 ± 0.009- 0.015+ 0.017, 0.173 ± 0.007- 0.013+ 0.014) for tensor current, respectively. With the obtained q2-dependent f+π (q2) and observed branching ratio (BR) for over(B, ̄)d → π+ ℓ over(ν, ̄), the Vu b is found as | Vu b |L F = (3.99 ± 0.13) × 10- 3. As a result, the predicted BRs for over(B, ̄) → (η, η) ℓ over(ν, ̄) decays with ℓ = e, μ are given by (0.49- 0.04 - 0.07+ 0.02 + 0.10, 0.24- 0.02 - 0.03+ 0.01 + 0.04) × 10- 4, while the BRs for D- → (η, η) ℓ over(ν, ̄) are (11.1- 0.6 - 0.9+ 0.5 + 0.9, 1.79- 0.08 - 0.12+ 0.07 + 0.12) × 10- 4. In addition, we also study the integrated lepton angular asymmetries for over(B, ̄) → (π, η, η) τ over(ν, ̄)τ: (0.277- 0.001 - 0.007+ 0.001 + 0.005, 0.290- 0.000 - 0.003+ 0.002 + 0.003, 0.312- 0.000 - 0.006+ 0.004 + 0.005).

Original languageEnglish
Pages (from-to)118-123
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume686
Issue number2-3
DOIs
Publication statusPublished - 2010 Mar 22

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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