scholarly journals ELECTROMAGNETIC FORM-FACTOR OF THE π MESON WITH LIGHT-CONE QCD SUM RULES

2008 ◽  
Vol 23 (27n28) ◽  
pp. 4621-4636 ◽  
Author(s):  
ZHI-GANG WANG ◽  
ZHI-BIN WANG
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
Momentum Transfer ◽  
Electromagnetic Form Factor ◽  
Light Cone ◽  
Sum Rules ◽  
Large Momentum ◽  
Normalization Condition ◽  
Qcd Sum Rules ◽  
Zero Momentum

In this paper, we calculate the electromagnetic form-factor of the π meson with the light-cone QCD sum rules. The numerical value [Formula: see text] is in excellent agreement with the experimental data (extrapolated to the limit of zero momentum transfer or the normalization condition Fπ(0) = 1). For large momentum transfers, the values from the two sum rules are all comparable with the experimental data and theoretical estimations.

scholarly journals PION TRANSITION FORM FACTOR AT THE TWO-LOOP LEVEL VIS-À-VIS EXPERIMENTAL DATA

2009 ◽  
Vol 24 (35n37) ◽  
pp. 2858-2867 ◽  
Author(s):  
S. V. MIKHAILOV ◽  
N. G. STEFANIS
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Form Factor ◽  
Light Cone ◽  
Transition Form Factor ◽  
Sum Rules ◽  
Leading Order ◽  
Transition Form ◽  
Qcd Sum Rules ◽  
Theoretical Results

We use light-cone QCD sum rules to calculate the pion-photon transition form factor, taking into account radiative corrections up to the next-to-next-to-leading order of perturbation theory. We compare the obtained predictions with all available experimental data from the CELLO, CLEO, and the BaBar Collaborations. We point out that the BaBar data are incompatible with the convolution scheme of QCD, on which our predictions are based, and can possibly be explained only with a violation of the factorization theorem. We pull together recent theoretical results and comment on their significance.

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.

scholarly journals Scalar form factor of the proton with light-cone QCD sum rules

2006 ◽  
Vol 73 (9) ◽  
Author(s):  
Zhi-Gang Wang ◽  
Shao-Long Wan ◽  
Wei-Min Yang
Keyword(s):  
Form Factor ◽  
Light Cone ◽  
Sum Rules ◽  
Scalar Form Factor ◽  
Qcd Sum Rules ◽  
Scalar Form

scholarly journals Study ofχc01P→J/ψγandχb0(1P)→Υ1SγDecays via QCD Sum Rules

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
V. Bashiry
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
Sum Rules ◽  
Branching Ratio ◽  
Full Width ◽  
Qcd Sum Rules ◽  
Experimental Bound ◽  
Frame Work

We present the calculation of the form factor of theχc01P→J/ψγandχb0(1P)→Υ1Sγ decays in the frame work of QCD sum rules. We also find branching ratioBrχc01P→J/ψγ=1.36-0.6+0.9×10-2which is in agreement with the experimental data. Furthermore, we estimate theΓtot(χb0(1P))=4.2-2.21+3.18 MeV, where experimental bound for full width ofχb0is Γtot(χb0(1P))<6 MeV.

scholarly journals Estimation of Nucleon D-Term in QCD

Particles ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 357-364 ◽  
Author(s):  
Igor V. Anikin
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
Light Cone ◽  
Sum Rules ◽  
Leading Order

Using the light-cone sum rules at leading order, we present an approach to perform the preliminary upper estimation for the nucleon gravitational form factor D ( t ) (D-term contribution). Comparison with the experimental data and with the results of different models is discussed.

scholarly journals Soft contribution to the pion form factor from light-cone QCD sum rules

1994 ◽  
Vol 328 (3-4) ◽  
pp. 457-465 ◽  
Author(s):  
Vladimir Braun ◽  
Igor Halperin
Keyword(s):  
Form Factor ◽  
Light Cone ◽  
Sum Rules ◽  
Pion Form Factor ◽  
Qcd Sum Rules

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.

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