gρσγcoupling constant in light cone QCD

Abstract

The coupling constant g ρσγ is determined from light cone QCD sum rules. A comparison of our result with the ones existing in literature is presented.

Higher meson resonances inρ→π0π0γOh1, Kim2 2003Phys. Rev. D10320View full textAdd to dashboardCite

“…The initial calculation of the σ meson contribution using direct ρσγ coupling [13,14] however overestimates the measured Γ(ρ → π 0 π 0 γ) by two orders of magnitude. This unrealistic result is later ascribed [15,16] to the large and momentum-independent ρσγ coupling (g ρσγ ≈ 2.2 ∼ 3.2) determined from the analyses of ρ meson photoproduction near threshold [17,18] or by QCD sum rules [19,20]. For the magnitude of the ρσγ coupling, the SND experiment extracted Γ(ρ → σγ) in a model-dependent way [1], which leads to a small coupling g ργσ ≈ 0.25 [21].…”

Investigation of the Λ b → Λℓ+ℓ− transition in universal extra dimension using form factors from full QCD

“…On the other hand, the aforesaid transition matrix elements in HQET is defined in terms of only two form factors, F 1 and F 2 as [23,24]:…”

StrongΛbNBandΛcNDvertices

“…For a better understanding of the heavy flavor physics, it is also necessary to gain deeper insight into the radiative, strong, and weak decays of the baryons containing a heavy quark. For related studies, see [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] and references therein.…”