scholarly journals CALCULATION OF COUPLING CONSTANT gϕπγIN QCD SUM RULES

2004 ◽  
Vol 19 (28) ◽  
pp. 2129-2134 ◽  
Author(s):  
C. AYDIN ◽  
A. H. YILMAZ
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
Coupling Constant ◽  
Qcd Sum Rules

The coupling constant of ϕ→π0γ decay is calculated using QCD sum rules. A comparison of our prediction on the coupling constant with the result obtained from analysis of the experimental data is performed.

scholarly journals ANALYSIS OF THE $B \to K^*_2(1430), a_2(1320), f_2(1270)$ FORM-FACTORS WITH LIGHT-CONE QCD SUM RULES

2011 ◽  
Vol 26 (37) ◽  
pp. 2761-2782 ◽  
Author(s):  
ZHI-GANG WANG
Keyword(s):  
Experimental Data ◽  
Light Cone ◽  
B Meson ◽  
Sum Rules ◽  
Form Factors ◽  
Distribution Amplitude ◽  
Qcd Sum Rules ◽  
Line Shapes ◽  
The Future

In this paper, we study the [Formula: see text] form-factors with the light-cone QCD sum rules, where the B-meson light-cone distribution amplitudes are used. In calculations, we observe that the line-shapes of the B-meson light-cone distribution amplitude ϕ+(ω) have significant impacts on the values of the form-factors, and expect to obtain severe constraints on the parameters of the B-meson light-cone distribution amplitudes from the experimental data in the future.

COMMENTS ON QCD SUM-RULE CALCULATIONS OF EXCLUSIVE TWO-BODY DECAYS OF CHARMED MESONS

1989 ◽  
Vol 04 (09) ◽  
pp. 877-883 ◽  
Author(s):  
LING-LIE CHAU ◽  
HAI-YANG CHENG
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
Theoretical Calculations ◽  
Charmed Mesons ◽  
Qcd Sum Rules ◽  
Generic Structure ◽  
Sum Rule ◽  
Quark Diagram ◽  
Model Independent ◽  
Decays Of Charmed Mesons

Exclusive two-body decay amplitudes of charmed mesons evaluated by Blok and Shifman (BS) using QCD sum rules are analyzed using the model-independent quark-diagram scheme, which helps to pin point the generic structure of the BS calculations, and their difficulties when compared with the experimental data. We also point out what experimental improvements on the data and which new data are most helpful in sharpening these comparisons. Some comments on possible ways of further improving the theoretical calculations are given.

scholarly journals ANALYSIS OF THE $B_q\to D_q(D_q^*)P$ AND $B_q\to D_q(D_q^*)V$ DECAYS WITHIN THE FACTORIZATION APPROACH IN QCD

2009 ◽  
Vol 24 (31) ◽  
pp. 5845-5860 ◽  
Author(s):  
K. AZIZI ◽  
R. KHOSRAVI ◽  
F. FALAHATI
Keyword(s):  
Experimental Data ◽  
Perturbative Qcd ◽  
Sum Rules ◽  
Branching Fraction ◽  
Form Factors ◽  
Transition Form ◽  
Qcd Sum Rules ◽  
Factorization Approach ◽  
Electroweak Penguin ◽  
Decay Widths

Using the factorization approach and considering the contributions of the current–current, QCD penguin and electroweak penguin operators at the leading approximation, the decay amplitudes and decay widths of [Formula: see text] and [Formula: see text] transitions, where q = u, d, s and P and V are pseudoscalar and vector mesons, are calculated in terms of the transition form factors of the Bq→Dq and [Formula: see text]. Having computed those form factors in three-point QCD sum rules, the branching fraction for these decays are also evaluated. A comparison of our results with the predictions of the perturbative QCD as well as the existing experimental data is presented.

scholarly journals Coupling constant for the J/ψDsDs vertex from QCD sum rules

2014 ◽  
Vol 929 ◽  
pp. 143-156 ◽  
Author(s):  
B. Osório Rodrigues ◽  
M.E. Bracco ◽  
M. Chiapparini
Keyword(s):  
Sum Rules ◽  
Coupling Constant ◽  
Qcd Sum Rules

scholarly journals Analysis of the Zc(4200) as axial-vector molecule-like state

2015 ◽  
Vol 30 (30) ◽  
pp. 1550168 ◽  
Author(s):  
Zhi-Gang Wang
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
Axial Vector ◽  
Vector Current ◽  
Axial Vector Current ◽  
Qcd Sum Rules ◽  
Color Octet ◽  
Type Molecule

In this paper, we assume the [Formula: see text] as the color octet–octet type axial-vector molecule-like state, and construct the color octet–octet type axial-vector current to study its mass and width with the QCD sum rules. The numerical values [Formula: see text] and [Formula: see text] are consistent with the experimental data [Formula: see text] and [Formula: see text], and support assigning the [Formula: see text] to be the color octet–octet type molecule-like state with [Formula: see text]. Furthermore, we discuss the possible assignments of the [Formula: see text], [Formula: see text] and [Formula: see text] as the diquark–antidiquark type tetraquark states with [Formula: see text].

scholarly journals Analysis of the heavy quarkonium states hc and hb with QCD sum rules

2014 ◽  
Vol 29 ◽  
pp. 1460233
Author(s):  
Zhi-Gang Wang ◽  
Shu-Yuan Guo
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
P Wave ◽  
Heavy Quarkonium ◽  
Qcd Sum Rules ◽  
Decay Constants ◽  
Spin Singlet ◽  
Structure Formula ◽  
Quark Structure ◽  
The Masses

In this article, we take the tensor currents [Formula: see text] to interpolate the P-wave spin-singlet heavy quarkonium states hQ, and study the masses and decay constants with the Borel sum rules and moments sum rules. The masses and decay constants from the Borel sum rules and moments sum rules are consistent with each other, the masses are also consistent with the experimental data. The heavy quarkonium states hQ couple potentially to the tensor currents [Formula: see text], and have the quark structure ϵijkξ†σkζ besides the quark structure [Formula: see text].

scholarly journals Charged exotic charmonium states

2014 ◽  
Vol 29 (05) ◽  
pp. 1430005 ◽  
Author(s):  
Marina Nielsen ◽  
Fernando S. Navarra
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
Experimental Information ◽  
Qcd Sum Rules ◽  
Theoretical Approaches ◽  
Decay Widths ◽  
Method Show ◽  
Charmonium States

In this review, we present and discuss all the experimental information about the charged exotic charmonium states, which have been observed over the last five years. We try to understand their properties such as masses and decay widths with QCD sum rules. We describe this method, show the results and compare them with the experimental data and with other theoretical approaches.

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].

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