NON-PERTURBATIVE QCD CHARGE ASYMMETRIC CORRECTIONS TO THE NN SCATTERING LENGTHS

1989 ◽  
Vol 04 (08) ◽  
pp. 713-719
Author(s):  
RIAZUDDIN ◽  
FAYYAZUDDIN
Keyword(s):  
Sum Rules ◽  
Experimental Information ◽  
Coupling Constants ◽  
The Other ◽  
Nuclear Forces ◽  
Charge Symmetry Breaking ◽  
Qcd Sum Rules ◽  
Charge Symmetry ◽  
Light Baryon ◽  
Scattering Lengths

The effect of the vacuum asymmetry [Formula: see text] on π0pp and π0nn coupling constants has been estimated in the QCD sum rules approach. This effect can contribute to charge symmetry breaking in nuclear forces (CSB). The experimental information on CSB is used to estimate εd and the other vacuum asymmetry. [Formula: see text]. It is shown that the values of εs larger than 0.3 still allowed by QCD sum rules in light baryon and meson sectors are not possible.

IN-MEDIUM NEUTRON-PROTON MASS DIFFERENCE WITH NUCLEAR CHIRAL MODELS

1992 ◽  
Vol 01 (04) ◽  
pp. 871-882 ◽  
Author(s):  
G. KREIN ◽  
D. P. MENEZES ◽  
M. NIELSEN
Keyword(s):  
Nuclear Matter ◽  
Degrees Of Freedom ◽  
Sum Rules ◽  
Mass Difference ◽  
Coupling Constants ◽  
Charge Symmetry Breaking ◽  
Charge Symmetry ◽  
Hartree Fock ◽  
Proton Mass ◽  
Quark Models

The neutron-proton mass difference in nuclear matter is calculated within the context of chiral models involving nucleon and meson degrees of freedom. The interplay of chiral symmetry and charge symmetry breaking on neutron and proton self-energies are discussed in a relativistic Hartree–Fock approximation. Exchange terms are crucial to obtain different contributions for the neutron and proton self-energies. Density dependence of meson masses and coupling constants are taken into account. We find that the neutron-proton mass difference in nuclear matter increases as the density increases, contrary to the predictions of several quark models and of QCD sum rules at finite density.

scholarly journals The Radiative Δ(1600) → γN Decay in the Light-Cone QCD Sum Rules

Universe ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 255
Author(s):  
Haifa I. Alrebdi ◽  
Thabit Barakat
Keyword(s):  
Decay Rate ◽  
Light Cone ◽  
Magnetic Dipole Moment ◽  
Sum Rules ◽  
Electric Quadrupole ◽  
The Other ◽  
Electric Quadrupole Moment ◽  
Multipole Moments ◽  
Qcd Sum Rules ◽  
Strongly Agree

Within the framework of the light-cone QCD sum rules method (LCSR’s), the radiative Δ(1600)→γN decay is studied. In particular, the magnetic dipole moment GM1(0) and the electric quadrupole moment GE1(0) are estimated. We also calculate the ratio REM=−GE1(0)GM1(0) and the decay rate. The predicted multipole moments and the decay rate strongly agree with the existing experimental results as well as with the other available phenomenological approaches.

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

Strong Coupling Constants of the Octet Baryons to K and π Mesons in Light Cone QCD Sum Rules

2007 ◽  
Author(s):  
T. M. Aliev ◽  
A. Ozpineci ◽  
S. Yakovlev ◽  
V. S. Zamiralov ◽  
Pietro Colangelo ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Light Cone ◽  
Sum Rules ◽  
Coupling Constants ◽  
Qcd Sum Rules ◽  
Octet Baryons

scholarly journals Analysis of the strong vertices of Σc∗ND and Σb∗NB in QCD sum rules

2017 ◽  
Vol 32 (35) ◽  
pp. 1750203 ◽  
Author(s):  
Guo-Liang Yu ◽  
Zhi-Gang Wang ◽  
Zhen-Yu Li
Keyword(s):  
Strong Coupling ◽  
Sum Rules ◽  
Form Factors ◽  
Coupling Constants ◽  
Strong Interactions ◽  
Dirac Structure ◽  
Qcd Sum Rules ◽  
Analytical Functions ◽  
Heavy Baryons ◽  
Perturbative Part

The strong coupling constants not only are important to understand the strong interactions of the heavy baryons, but can also help us reveal the nature and structure of these baryons. Additionally, researchers indeed have made great efforts to calculate some of the strong coupling constants, [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], etc. In this paper, we analyze the strong vertices [Formula: see text] and [Formula: see text] using the three-point QCD sum rules under the Dirac structure of [Formula: see text]. We perform our analysis by considering the contributions of the perturbative part and the condensate terms of [Formula: see text] and [Formula: see text]. After the form factors are calculated, they are then fitted into analytical functions which are used to get the strong coupling constants for these two vertices. The final results are [Formula: see text] and [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.

Sign in / Sign up

Export Citation Format

Share Document