Weak radiative decays of hyperons: Quarks,SU(6)W, and vector-meson dominance

1989 ◽  
Vol 40 (7) ◽  
pp. 2290-2300 ◽  
Author(s):  
P. Żenczykowski
Keyword(s):  
Vector Meson ◽  
Radiative Decays ◽  
Vector Meson Dominance

scholarly journals FEASIBILITY OF EXTRACTING Vtd FROM RADIATIVE B(Bs) DECAYS

1996 ◽  
Vol 11 (20) ◽  
pp. 3743-3759 ◽  
Author(s):  
D. ATWOOD ◽  
B. BLOK ◽  
A. SONI
Keyword(s):  
Vector Meson ◽  
Short Distance ◽  
Experimental Information ◽  
Radiative Decays ◽  
Vector Meson Dominance ◽  
Long Distance

We use experimental information on D−→K*0ρ− and B→ψ+K*, coupled with flavor independence of QCD, and with vector meson dominance, to show that long distance (LD) contributions to B→ρ+γ, especially to B−→ρ−+γ, are potentially very serious. Estimates based on the annihilation graph are shown to lead to similar conclusions. We emphasize that LD contributions can be appreciably different in B−→ρ−+γ and B0→ρ0(ω)+γ. All radiative decays of B, Bs are shown to be governed essentially by two LD and two short distance (SD) hadronic entities. Despite the presence of considerable LD contributions, we show how separate measurements of B−→ρ−+γ, B0→ρ0(ω)+γ, along with B→K*+γ, can be used for a systematic extraction of Vtd. Measurements of Bs→ɸ+γ and K*0+γ could also provide very useful consistency checks.

scholarly journals Excited vector mesons: phenomenology and predictions for a yet unknown vector ss state with a mass of about 1.93 GeV

2018 ◽  
Vol 182 ◽  
pp. 02097
Author(s):  
M. Piotrowska ◽  
F. Giacosa
Keyword(s):  
Vector Meson ◽  
Relativistic Quantum ◽  
Radiative Decays ◽  
Vector Meson Dominance ◽  
Vector Mesons ◽  
Quantum Numbers ◽  
Pseudoscalar Mesons ◽  
Unknown Vector ◽  
Field Theoretical Model ◽  
Open Issues

The firm understanding of standard quark-antiquark states (including excited states) is necessary to search for non-conventional mesons with the same quantum numbers. In this work, we study the phenomenology of two nonets of excited vector mesons, which predominantly correspond to radially excited vector mesons with quantum numbers n2S+1LJ = 23S1 and to orbitally excited vector mesons with quantum numbers n2S+1LJ = 13D1. We evaluate the decays of these mesons into two pseudoscalar mesons and into a pseudoscalar and a ground-state vector meson by making use of a relativistic quantum field theoretical model based on flavor symmetry. Moreover, we also study the radiative decays into a photon and a pseudoscalar meson by using vector meson dominance. We compare our results to the PDG and comment on open issues concerning the corresponding measured resonances. Within our approach, we are also able to make predictions for a not-yet discovered ss state in the n2S+1LJ = 13D1 nonet, which has a mass of about 1.93 GeV. This resonance can be searched in the upcoming GlueX and CLAS12 experiments which take place at the Jefferson Lab.

scholarly journals THE ωρπ COUPLING IN THE VMD MODEL REVISITED

2012 ◽  
Vol 27 (19) ◽  
pp. 1250101 ◽  
Author(s):  
D. GARCÍA GUDIÑO ◽  
G. TOLEDO SÁNCHEZ
Keyword(s):  
Vector Meson ◽  
Decay Width ◽  
Cross Section ◽  
Weighted Average ◽  
Contact Term ◽  
Radiative Decays ◽  
Vector Meson Dominance ◽  
Dominance Model ◽  
Vector Meson Dominance Model ◽  
Definite Answer

We determine the value of the ω-ρ-π mesons coupling (gωρπ), in the context of the vector meson dominance model, from radiative decays, the ω→3π decay width and the e+e-→3π cross-section. For the last two observables we consider the effect of either a heavier resonance (ρ′(1450)) or a contact term. A weighted average of the results from the set of observables yields gωρπ = 14.7±0.1 GeV -1 in absence of those contributions, and gωρπ = 11.9 ± 0.2 GeV -1 or gωρπ = 11.7 ± 0.1 GeV -1 when including the ρ′ or contact term, respectively. The inclusion of these additional terms makes the estimates from the different observables to lay in a more reduced range. Improved measurements of these observables and the ρ′(1450) meson parameters are needed to give a definite answer on the pertinence of the inclusion of this last one in the considered processes.

scholarly journals VECTOR MESON DOMINANCE AND RADIATIVE DECAYS OF HEAVY SPIN-3/2 BARYONS TO HEAVY SPIN-1/2 BARYONS

2012 ◽  
Vol 27 (11) ◽  
pp. 1250054 ◽  
Author(s):  
T. M. ALIEV ◽  
M. SAVCI ◽  
V. S. ZAMIRALOV
Keyword(s):  
Vector Meson ◽  
Light Cone ◽  
Radiative Decay ◽  
Sum Rules ◽  
Coupling Constants ◽  
Radiative Decays ◽  
Vector Meson Dominance ◽  
Qcd Sum Rules ◽  
Light Vector ◽  
Decay Widths

Using the calculated values of the strong coupling constants of the heavy sextet spin-3/2 baryons to sextet and antitriplet heavy spin-1/2 baryons with light vector mesons within the light cone QCD sum rules method, and vector meson dominance assumption, the radiative decay widths are calculated. These widths are compared with the "direct" radiative decay widths predicted in the framework of the light cone QCD sum rules.

Sign in / Sign up

Export Citation Format

Share Document