scholarly journals The newly observed $$\Lambda _b(6072)^0$$ structure and its $$\rho $$-mode nonstrange partners

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Wei Liang ◽  
Qi-Fang Lü
Keyword(s):  
Quark Model ◽  
Decay Width ◽  
Final States ◽  
Strong Decay ◽  
Total Decay Width ◽  
Diquark Model ◽  
Mode Excitation

Abstract Inspired by the newly observed $$\Lambda _b(6072)$$Λb(6072) structure, we investigate its strong decay behaviors under various assignments within the $$^3P_0$$3P0 model. Compared with the mass and total decay width, our results suggest that the $$\Lambda _b(6072)$$Λb(6072) can be regarded as the lowest $$\rho $$ρ-mode excitation in $$\Lambda _b$$Λb family. Then, the strong decays of $$\rho $$ρ-mode nonstrange partners for the $$\Lambda _b(6072)$$Λb(6072) are calculated. It is found that the $$J^P=5/2^-$$JP=5/2-$$\Lambda _b$$Λb and $$\Lambda _c$$Λc states are relatively narrow, and mainly decay into the $$\Sigma _b^{(*)} \pi $$Σb(∗)π and $$\Sigma _c^{(*)} \pi $$Σc(∗)π final states, respectively. These two states have good potentials to be observed in future experiments, which may help us to distinguish the three-quark model and diquark model.

scholarly journals STRUCTURE OF Λ*(1405) AND THE Λ*-MESON-BARYON COUPLING CONSTANTS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 619-621 ◽  
Author(s):  
C. S. AN ◽  
B. SAGHAI
Keyword(s):  
Quark Model ◽  
Decay Width ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Coupling Constants ◽  
Strong Decay ◽  
Quark Structure

Within an extended chiral constituent quark model, three- and five-quark structure of the S01 resonance Λ(1405) is investigated with respect to the coupling constants [Formula: see text] and [Formula: see text]. Our findings corroborate with about 50% of five-quark admixture in the Λ(1405) needed in reproducing the strong decay width, ΓΛ(1405)→(Σπ)°.

Strong decay of hadrons in a semirelativistic quark model

1986 ◽  
Vol 34 (11) ◽  
pp. 3405-3413 ◽  
Author(s):  
R. Sartor ◽  
Fl. Stancu
Keyword(s):  
Quark Model ◽  
Strong Decay

scholarly journals The strong decay patterns of $$Z_c$$ and $$Z_b$$ states in the relativized quark model

2019 ◽  
Vol 79 (7) ◽  
Author(s):  
Guang-Juan Wang ◽  
Xiao-Hai Liu ◽  
Li Ma ◽  
Xiang Liu ◽  
Xiao-Lin Chen ◽  
...  
Keyword(s):  
Quark Model ◽  
Strong Decay

scholarly journals The $$\varOmega _{ c}$$-puzzle solved by means of quark model predictions

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
E. Santopinto ◽  
A. Giachino ◽  
J. Ferretti ◽  
H. García-Tecocoatzi ◽  
M. A. Bedolla ◽  
...  
Keyword(s):  
Harmonic Oscillator ◽  
Quark Model ◽  
Quantum Number ◽  
Decay Width ◽  
Degrees Of Freedom ◽  
Model Predictions ◽  
Suitable Environment ◽  
Important Milestone

AbstractThe observation of five $$\varOmega _c $$Ωc= ssc states by LHCb [Aaij et al. Phys. Rev. Lett. 118, 182001 (2017)] and the confirmation of four of them by Belle [Yelton et al. Phys. Rev. D 97, 051102 (2018)], may represent an important milestone in our understanding of the quark organization inside hadrons. By providing results for the spectrum of $$\varOmega _{ c}$$Ωc baryons and predictions for their $$\varXi _{ c}^{+}K^{-}$$Ξc+K- and $$\varXi _{ c}'^{+}K^{-}$$Ξc′+K- decay amplitudes within an harmonic oscillator based model, we suggest a possible solution to the $$\varOmega _{c}$$Ωc quantum number puzzle and we extend our mass and decay width predictions to the $$\varOmega _b$$Ωb states. Finally, we discuss why the set of $$\varOmega _{ c(b)}$$Ωc(b) baryons is the most suitable environment to test the validity of three-quark and quark–diquark effective degrees of freedom.

scholarly journals DATA TAKING STRATEGY FOR THE PHASE STUDY IN ψ′→K+K-

2012 ◽  
Vol 27 (25) ◽  
pp. 1250150 ◽  
Author(s):  
B. Q. WANG ◽  
X. H. MO ◽  
C. Z. YUAN ◽  
Y. BAN
Keyword(s):  
Decay Width ◽  
Relative Phase ◽  
Resonance Peak ◽  
Numerical Results ◽  
Point Of View ◽  
Theoretical Point ◽  
Total Decay Width ◽  
Decay Channels ◽  
Phase Study ◽  
Scan Data

The study of the relative phase between strong and electromagnetic amplitudes is of great importance for understanding the dynamics of charmonium decays. The information of the phase can be obtained model-independently by fitting the scan data of some special decay channels, one of which is ψ′ →K+K-. To find out the optimal data taking strategy for a scan experiment in the measurement of the phase in ψ′ →K+ K-, the minimization process is analyzed from a theoretical point of view. The result indicates that for one-parameter fit, only one data taking point in the vicinity of a resonance peak is sufficient to acquire the optimal precision. Numerical results are obtained by fitting simulated scan data. Besides the results related to the relative phase between strong and electromagnetic amplitudes, the method is extended to analyze the fits of other resonant parameters, such as the mass and the total decay width of ψ′.

scholarly journals Direct Measurement of the Total Decay Width of the Top Quark

2013 ◽  
Vol 111 (20) ◽  
Author(s):  
T. Aaltonen ◽  
S. Amerio ◽  
D. Amidei ◽  
A. Anastassov ◽  
A. Annovi ◽  
...  
Keyword(s):  
Decay Width ◽  
Direct Measurement ◽  
Top Quark ◽  
Total Decay Width

scholarly journals Effective Hadronic Supersymmetry from Quantum Chromodynamics

2019 ◽  
Vol 64 (12) ◽  
pp. 1096
Author(s):  
S. Catto ◽  
Y. Gürcan ◽  
B. Nicolescu ◽  
E. Yu
Keyword(s):  
Symmetry Breaking ◽  
Quantum Chromodynamics ◽  
Quark Model ◽  
Diquark Model ◽  
Approximate Symmetries ◽  
Breaking Mechanism ◽  
Good Agreement ◽  
Hadronic Spectrum

A quark model with potentials derived from QCD that include antiquark-diquark model for excited hadrons leads to mass formulae in very good agreement with experiments. The approximate symmetries and supersymmetries of the hadronic spectrum are exploited including a symmetry breaking mechanism.

scholarly journals Strong decays of the $$\varXi (1620)^0$$ as a $$\varLambda {\bar{K}}$$ and $$\varSigma {\bar{K}}$$ molecule

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Yin Huang ◽  
Lisheng Geng
Keyword(s):  
Decay Width ◽  
Decay Channel ◽  
Molecular State ◽  
The Other ◽  
Partial Decay Width ◽  
Total Width ◽  
Strong Decay ◽  
Spin Parity

AbstractIn this work, we study the strong decays of the newly observed $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 assuming that it is a meson-baryon molecular state of $$\varLambda {\bar{K}}$$ Λ K ¯ and $$\varSigma {\bar{K}}$$ Σ K ¯ . We consider four possible spin-parity assignments $$J^P=1/2^{\pm }$$ J P = 1 / 2 ± and $$3/2^{\pm }$$ 3 / 2 ± for the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 , and evaluate its partial decay width into $$\varXi \pi $$ Ξ π and $$\varXi \pi \pi $$ Ξ π π via hadronic loops with the help of effective Lagrangians. In comparison with the Belle data, the calculated decay width favors the spin-party assignment $$1/2^-$$ 1 / 2 - while the other spin-parity assignments do not yield a decay width consistent with data in the molecule picture. We find that about 52–68% of the total width comes from the $${\bar{K}}\varLambda $$ K ¯ Λ channel, while the rest is provided by the $${\bar{K}}\varSigma $$ K ¯ Σ channel. As a result, both channels are important in explaining the strong decay of the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 . In addition, the transition $$\varXi (1620)^0\rightarrow \pi \varXi $$ Ξ ( 1620 ) 0 → π Ξ is the main decay channel in the $$J^{P}=1/2^{-}$$ J P = 1 / 2 - case, which almost saturates the total width. These information are helpful to further understand the nature of the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 .

A measurement of the electronic widths Γ ee of the ϒ(1S), ϒ(2S), and ϒ(4S) resonances, and of the total decay width Γ of the ϒ(4S)

1995 ◽  
Vol 65 (4) ◽  
pp. 619-625 ◽  
Author(s):  
◽  
H. Albrecht ◽  
T. Hamacher ◽  
R. P. Hofmann ◽  
T. Kirchhoff ◽  
...  
Keyword(s):  
Decay Width ◽  
Total Decay Width
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