2010/02/28 by Ho-Meoyng Choi · 18 citations
Computer Science · Physics and Astronomy · #Branching fraction #Computational Physics and Python Applications #Lepton #Mixing (physics) #Particle physics theoretical and experimental studies #Polarization (electrochemistry) #Quantum Chromodynamics and Particle Interactions #Quark #Quark model #Standard Model (mathematical formulation) #hep-ph
paper · pdf · doi:10.1088/0954-3899/37/8/085005
published in Journal of Physics G Nuclear and Particle Physics 37(8), 085005 (IOP Publishing) · 20 pages, 6 figures, minor revision. version to appear in Journal of Physics G
openalex publication_date 2010/06/21 · arxiv created 2010/06/22 · arxiv updated 2015/05/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Using the light-front quark model, we calculate the transition form factors, decay rates and longitudinal lepton polarization asymmetries for the exclusive rare ) (ℓ = e , μ, τ) decays within the standard model, taking into account the η − η' mixing angle. For the mixing angle θ = −20° (−10°) in the octet-singlet basis, we obtain , BR( B s → ημ + μ − ) = 1.5(2.4) × 10 −7 , BR( B s → ητ + τ − ) = 3.8(5.8) × 10 −8 , , BR( B s → η'μ + μ − ) = 2.4(1.8) × 10 −7 and BR( B s → η'τ + τ − ) = 3.4(2.6) × 10 −8 , respectively. The branching ratios for the decays are at least an order of magnitude smaller than those for the decays. The averaged values of the lepton polarization asymmetries for B s → ( K , η (') )ℓ + ℓ − are obtained as , ⟨ P K L ⟩ τ = −0.24, ⟨ P η L ⟩ τ = −0.20 and , respectively.