scholarly journals Strong decays of heavy tensor mesons in QCD sum rules

2016 ◽  
Vol 31 (06) ◽  
pp. 1650036 ◽  
Author(s):  
Zhen-Yu Li ◽  
Zhi-Gang Wang ◽  
Guo-Liang Yu
Keyword(s):  
Decay Width ◽  
Sum Rules ◽  
Order Approximation ◽  
Coupling Constants ◽  
Leading Order ◽  
Strong Decay ◽  
Qcd Sum Rules ◽  
Consistent Description ◽  
Decay Widths ◽  
Tensor Formula

In this paper, the tensor–vector–pseudoscalar (TVP) type of vertices are analyzed with the QCD sum rules (QCDSR) and the local-QCD sum rules (SR) in the leading-order approximation and the hadronic coupling constants [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] together with the corresponding decay widths are then calculated. The results indicate that QCDSR as well as the local-QCDSR give a consistent description. The calculated strong decay widths and decay width ratios are compared with the available experimental and other theoretical values. Finally, the total widths [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are discussed in detail. The results show that these total widths are underestimated, especially for the tensor [Formula: see text] and [Formula: see text] mesons where the obtained predictions are almost a factor of 2 lower than measured decay widths.

scholarly journals Analysis of the strong vertices of ΣcND∗ and ΣbNB∗ in QCD sum rules

2018 ◽  
Vol 33 (36) ◽  
pp. 1850217
Author(s):  
Guo-Liang Yu ◽  
Rong-Hua Guan ◽  
Zhi-Gang Wang
Keyword(s):  
Strong Coupling ◽  
Sum Rules ◽  
Form Factors ◽  
Coupling Constants ◽  
Coupling Constant ◽  
Strong Decay ◽  
Qcd Sum Rules ◽  
Dirac Structures ◽  
Analytical Functions ◽  
Perturbative Part

The strong coupling constant is an important parameter that can help us understand the strong decay behaviors of baryons. In our previous work, we have analyzed the strong vertices [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] in QCD sum rules. Following these works, we further analyze the strong vertices [Formula: see text] and [Formula: see text] using the three-point QCD sum rules under Dirac structures [Formula: see text] and [Formula: see text]. In this work, we first calculate strong form-factors considering contributions of the perturbative part and the condensate terms [Formula: see text], [Formula: see text] and [Formula: see text]. Then, these form-factors are used to fit into analytical functions. According to these functions, we finally determine the values of the strong coupling constants for these two vertices [Formula: see text] and [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 ANALYSIS OF JPC=1-+ EXOTIC HYBRID ηπ, η′π DECAYS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1973-1976
Author(s):  
AILIN ZHANG ◽  
T. G. STEELE
Keyword(s):  
Decay Width ◽  
Sum Rules ◽  
Underlying Mechanism ◽  
Qcd Sum Rules ◽  
Quark Mixing ◽  
Decay Widths

Investigations of the mass and decays of the JPC=1-+ hybrid are reviewed, including calculation of the π1(1-+)→ηπ, η′π decay widths within the QCD sum rules technique. In this calculation, the recently-proposed η, η′ quark mixing scheme is employed. The results indicate that the decay width Γπ1→ηπ≈250 MeV is large compared with the decay width Γπ1→η′π≈20 MeV . Inspired by these results, some phenomenological approaches are suggested to gain an understanding of the underlying mechanism of ηπ and η′π hybrid decays.

scholarly journals ρ-decay widths of excited heavy mesons from light-cone QCD sum rules in the leading order of HQET

1998 ◽  
Vol 58 (9) ◽  
Author(s):  
Shi-Lin Zhu ◽  
Yuan-Ben Dai
Keyword(s):  
Light Cone ◽  
Sum Rules ◽  
Leading Order ◽  
Qcd Sum Rules ◽  
Heavy Mesons ◽  
Decay Widths

scholarly journals Erratum: Decay widths of excited heavy mesons from QCD sum rules at the leading order of HQET [Phys. Rev. D58, 094032 (1998)]

1999 ◽  
Vol 59 (5) ◽  
Author(s):  
Yuan-Ben Dai ◽  
Chao-Shang Huang ◽  
Ming-Qiu Huang ◽  
Hong-Ying Jin ◽  
Chun Liu
Keyword(s):  
Sum Rules ◽  
Leading Order ◽  
Qcd Sum Rules ◽  
Heavy Mesons ◽  
Decay Widths

Calculation of coupling constants and decay width of light meson with kaon from QCD sum rules

2017 ◽  
Vol 96 (3) ◽  
Author(s):  
E. Kazemi ◽  
N. Ghahramany
Keyword(s):  
Decay Width ◽  
Sum Rules ◽  
Coupling Constants ◽  
Light Meson ◽  
Qcd Sum Rules

scholarly journals Decay widths of excited heavy mesons from QCD sum rules at the leading order of HQET

1998 ◽  
Vol 58 (9) ◽  
Author(s):  
Yuan-Ben Dai ◽  
Chao-Shang Huang ◽  
Ming-Qiu Huang ◽  
Hong-Ying Jin ◽  
Chun Liu
Keyword(s):  
Sum Rules ◽  
Leading Order ◽  
Qcd Sum Rules ◽  
Heavy Mesons ◽  
Decay Widths

scholarly journals Reanalysis of Ωc→Ξc+K- Decay in QCD

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
T. M. Aliev ◽  
S. Bilmis ◽  
M. Savci
Keyword(s):  
Experimental Data ◽  
Strong Coupling ◽  
Light Cone ◽  
Sum Rules ◽  
Negative Parity ◽  
Coupling Constants ◽  
Qcd Sum Rules ◽  
Quantum Numbers ◽  
Decay Widths

The strong coupling constants of newly observed Ωc0 baryons with spins J=1/2 and J=3/2 decaying into Ξc+K- are estimated within light cone QCD sum rules. The calculations are performed within two different scenarios on quantum numbers of Ωc baryons: (a) all newly observed Ωc baryons are negative parity baryons; that is, the Ωc(3000), Ωc(3050), Ωc(3066), and Ωc(3090) have quantum numbers JP=1/2- and JP=3/2- states, respectively; (b) the states Ωc(3000) and Ωc(3050) have quantum numbers JP=1/2- and JP=1/2+, while the states Ωc(3066) and Ωc(3090) have the quantum numbers JP=3/2- and JP=3/2+, respectively. By using the obtained results on the coupling constants, we calculate the decay widths of the corresponding decay. The results on decay widths are compared with the experimental data of LHC Collaboration. We found out that the predictions on decay widths within these scenarios are considerably different from the experimental data; that is, both considered scenarios are ruled out.

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.

QCD sum rules for the coupling constants g KYN and g KYΞ

2007 ◽  
Vol 70 (5) ◽  
pp. 925-937
Author(s):  
T. Aliev ◽  
V. S. Zamiralov ◽  
S. N. Lepshokov ◽  
A. Özpineci ◽  
S. B. Yakovlev
Keyword(s):  
Sum Rules ◽  
Coupling Constants ◽  
Qcd Sum Rules
Sign in / Sign up

Export Citation Format

Share Document