Calculation ofD * →Dγ andD * →Dπ decay widths from QCD sum rules

1985 ◽  
Vol 28 (1) ◽  
pp. 155-161 ◽  
Author(s):  
V. L. Eletsky ◽  
Ya. I. Kogan
Keyword(s):  
Sum Rules ◽  
Qcd Sum Rules ◽  
Decay Widths

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 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].

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.

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

scholarly journals X(3872)→J/ψπ+π− and X(3872)→J/ψπ+π−π0 decay widths from QCD sum rules

2006 ◽  
Vol 639 (3-4) ◽  
pp. 272-277 ◽  
Author(s):  
F.S. Navarra ◽  
M. Nielsen
Keyword(s):  
Sum Rules ◽  
Qcd Sum Rules ◽  
Decay Widths

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
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