scholarly journals Transition form factors and helicity amplitudes for electroexcitation of negative and positive parity nucleon resonances in a light-front quark model

2019 ◽  
Vol 100 (9) ◽  
Author(s):  
Igor T. Obukhovsky ◽  
Amand Faessler ◽  
Dimitry K. Fedorov ◽  
Thomas Gutsche ◽  
Valery E. Lyubovitskij
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Light Front ◽  
Positive Parity ◽  
Transition Form ◽  
Nucleon Resonances ◽  
Helicity Amplitudes

scholarly journals Charmed $$\Omega _c$$ weak decays into $$\Omega $$ in the light-front quark model

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Yu-Kuo Hsiao ◽  
Ling Yang ◽  
Chong-Chung Lih ◽  
Shang-Yuu Tsai
Keyword(s):  
Quark Model ◽  
Recent Observation ◽  
Branching Fractions ◽  
Form Factors ◽  
Weak Decay ◽  
Current Data ◽  
Light Front ◽  
Transition Form ◽  
Decay Modes ◽  
Weak Decays

AbstractMore than ten $$\Omega _c^0$$ Ω c 0 weak decay modes have been measured with the branching fractions relative to that of $$\Omega ^0_c\rightarrow \Omega ^-\pi ^+$$ Ω c 0 → Ω - π + . In order to extract the absolute branching fractions, the study of $$\Omega ^0_c\rightarrow \Omega ^-\pi ^+$$ Ω c 0 → Ω - π + is needed. In this work, we predict $${{\mathcal {B}}}_\pi \equiv {{\mathcal {B}}}(\Omega _c^0\rightarrow \Omega ^-\pi ^+)=(5.1\pm 0.7)\times 10^{-3}$$ B π ≡ B ( Ω c 0 → Ω - π + ) = ( 5.1 ± 0.7 ) × 10 - 3 with the $$\Omega _c^0\rightarrow \Omega ^-$$ Ω c 0 → Ω - transition form factors calculated in the light-front quark model. We also predict $${{\mathcal {B}}}_\rho \equiv {{\mathcal {B}}}(\Omega _c^0\rightarrow \Omega ^-\rho ^+)=(14.4\pm 0.4)\times 10^{-3}$$ B ρ ≡ B ( Ω c 0 → Ω - ρ + ) = ( 14.4 ± 0.4 ) × 10 - 3 and $${{\mathcal {B}}}_e\equiv {{\mathcal {B}}}(\Omega _c^0\rightarrow \Omega ^-e^+\nu _e)=(5.4\pm 0.2)\times 10^{-3}$$ B e ≡ B ( Ω c 0 → Ω - e + ν e ) = ( 5.4 ± 0.2 ) × 10 - 3 . The previous values for $${{\mathcal {B}}}_\rho /{{\mathcal {B}}}_\pi $$ B ρ / B π have been found to deviate from the most recent observation. Nonetheless, our $${{\mathcal {B}}}_\rho /{{\mathcal {B}}}_\pi =2.8\pm 0.4$$ B ρ / B π = 2.8 ± 0.4 is able to alleviate the deviation. Moreover, we obtain $${{\mathcal {B}}}_e/{{\mathcal {B}}}_\pi =1.1\pm 0.2$$ B e / B π = 1.1 ± 0.2 , which is consistent with the current data.

scholarly journals Radiative πϱ and πω transition form factors in a light-front constituent quark model

1995 ◽  
Vol 359 (1-2) ◽  
pp. 1-7 ◽  
Author(s):  
F. Cardarelli ◽  
I.L. Grach ◽  
I.M. Narodetskii ◽  
G. Salmé ◽  
S. Simula
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Form Factors ◽  
Constituent Quark Model ◽  
Light Front ◽  
Transition Form
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