scholarly journals as a tetraquark state with QCD sum rules in heavy quark limit

2006 ◽  
Vol 778 (1-2) ◽  
pp. 22-29 ◽  
Author(s):  
Zhi-Gang Wang ◽  
Shao-Long Wan
Keyword(s):  
Heavy Quark ◽  
Sum Rules ◽  
Tetraquark State ◽  
Qcd Sum Rules ◽  
Heavy Quark Limit

scholarly journals SUM RULES IN THE HEAVY QUARK LIMIT OF QCD AND ISGUR-WISE FUNCTIONS

2005 ◽  
Author(s):  
F. JUGEAU ◽  
A. LE YAOUANC ◽  
L. OLIVER ◽  
J.-C. RAYNAL
Keyword(s):  
Heavy Quark ◽  
Sum Rules ◽  
Heavy Quark Limit

scholarly journals QCD sum rules in the effective heavy quark theory

1992 ◽  
Vol 278 (4) ◽  
pp. 457-464 ◽  
Author(s):  
E. Bagan ◽  
Patricia Ball ◽  
V.M. Braun ◽  
H.G. Dosch
Keyword(s):  
Heavy Quark ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Quark Theory

scholarly journals Assignments of the X 4140 , X 4500 , X 4630 , and X 4685 Based on the QCD Sum Rules

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhi-Gang Wang
Keyword(s):  
Excited State ◽  
Sum Rules ◽  
Molecular State ◽  
Tetraquark State ◽  
Qcd Sum Rules ◽  
Scattering States ◽  
Scattering State ◽  
Good Agreement

In this article, we take into account our previous calculations based on the QCD sum rules, and tentatively assign the X 4630 as the D s ∗ D ¯ s 1 − D s 1 D ¯ s ∗ tetraquark molecular state or c s P c ¯ s ¯ A + c s A c ¯ s ¯ P tetraquark state with the J P C = 1 − + , and assign the X 3915 and X 4500 as the 1S and 2S c s A c ¯ s ¯ A tetraquark states, respectively, with the J P C = 0 + + . Then, we extend our previous works to investigate the LHCb’s new tetraquark candidate X 4685 as the first radial excited state of the X 4140 with the QCD sum rules and obtain the mass M X = 4.70 ± 0.12   GeV , which is in very good agreement with the experimental value 4684 ± 7 − 16 + 13   MeV . Furthermore, we investigate the two-meson scattering state contributions in details and observe that the two-meson scattering states alone cannot saturate the QCD sum rules, the contributions of the tetraquark states play an unsubstitutable role, and we can saturate the QCD sum rules with or without the two-meson scattering states.

scholarly journals Analysis of strong decays of the Zc(4600) with the QCD sum rules

2019 ◽  
Vol 34 (20) ◽  
pp. 1950110 ◽  
Author(s):  
Zhi-Gang wang
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
Tetraquark State ◽  
Qcd Sum Rules ◽  
Text Type ◽  
Decay Widths ◽  
The Future ◽  
Hadron Duality

In this paper, we tentatively assign the [Formula: see text] to be the [Formula: see text] type vector tetraquark state and study its two-body strong decays with the QCD sum rules based on solid quark–hadron duality, the predictions for the partial decay widths [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] can be compared to the experimental data in the future to diagnose the nature of the [Formula: see text].

QCD SUM RULES FOR THE $Z_c^+(3900)$ STATE

2014 ◽  
Vol 26 ◽  
pp. 1460069 ◽  
Author(s):  
F. S. NAVARRA ◽  
J. M. DIAS ◽  
M. NIELSEN ◽  
C. M. ZANETTI
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
Coupling Constants ◽  
Tetraquark State ◽  
Point Function ◽  
Qcd Sum Rules ◽  
Decay Widths ◽  
Structure Formula ◽  
Good Agreement

We use the QCD sum rules to study the recently observed charmonium-like structure [Formula: see text] as a tetraquark state. We evaluate the three-point function and extract the coupling constants of the [Formula: see text] and [Formula: see text] vertices and the corresponding decay widths in these channels. The results obtained are in good agreement with the experimental data and supports to the tetraquark picture of this state.

scholarly journals More conservation laws and sum rules in the heavy quark limit

1996 ◽  
Vol 53 (7) ◽  
pp. 3998-4005 ◽  
Author(s):  
Chi-Keung Chow ◽  
Dan Pirjol
Keyword(s):  
Conservation Laws ◽  
Heavy Quark ◽  
Sum Rules ◽  
Heavy Quark Limit
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