2009/01/30 by A. V. Anisovich, V.V. Anisovich, V. V. Anisovich +6
Physics and Astronomy · #Bremsstrahlung #Coupling (piping) #Meson #Nuclear physics #Nuclear physics research studies #Nucleon #Omega #Particle physics #Particle physics theoretical and experimental studies #Physics #Pi #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #hep-ph
paper · pdf · doi:10.1134/s1063778810030087
published as Phys.Atom.Nucl.73:462-477,2010 · 23 pages in IOP format
arxiv created 2009/01/30 · openalex publication_date 2010/03/01 · arxiv updated 2014/11/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In the framework of the relativistic and gauge-invariant spectral integral technique, we calculate radiative decays ρ(770) → γπ(140) and ω(780) → γπ(140) supposing all mesons (π, ρ, and ω) to be quark-antiquark states. The q q wave functions found for mesons and photon lead to a reasonably good description of data ( Γ ρ ^ ± → γ π ^ ± (exp ) = 68 ± 30 keV, Γ ρ 0 → γ π 0 (exp ) = 77 ± 28 keV, Γ ω → γ π 0 (exp ) = 776 ± 45 keV) which makes it possible to estimate the coupling for the bremsstrahlung emission of pion by quarks g π ≡ g π (u → dπ). We have found two values for the pion bremsstrahlung coupling: |g π | = 16.7 ± 0.3 −2.3 +0.1 (Solution I) and |g π | = 3.0 ± 0.3 −2.1 +0.1 (Solution II). Within SU(6) symmetry for nucleons, Solution I gives us for πNN coupling the value 16.4 ≤ g 2 (4π) ≤ 23.2, which is in qualitative agreement with the πN scattering data, g 2 /(4π) ~ 14. For excited states, we have estimated the partial widths in Solution I as follows: Γ(ρ 2 ± → γπ) ~ 10–130 keV, Γ(ρ 2 0 → γπ) ~ 10–130 keV, Γ(ω 2S → γπ) ~ 60–1080 keV. The large uncertainties emphasize the necessity to carry out measurements of the meson radiative processes in the region of large masses.