2,524 research outputs found
Determination of the -- mixing angle from QCD sum rules
The -- mixing angle is calculated in framework of the QCD
sum rules. We find that our prediction for the mixing angle is which is in good agreement with the quark model prediction, and
approximately two times larger than the recent lattice QCD calculations.Comment: 5 pages, no figures, LaTeX formatte
Properties of excited states in QCD
The mass and leptonic decay constants of recently observed two new excited
states at LHC are studied within the QCD sum rules. Considering the
contributions of the ground and radially excited states, the mass and residues
of the excited states of pseudoscalar and vector mesons are calculated in the
framework of two different approaches of the QCD sum rules, namely, linear
combinations of the corresponding sum rules and its derivatives as well as QCD
sum rules with the incorporation of the least square fitting method. The
obtained results on mass and
are in good agreement with the
experimental data. Our predictions for the decay constants of these states are:
and , which can be checked at future experiments to be conducted at
the LHC. Comparison of our results with the predictions of the other approaches
on mass and residues is also presented.Comment: 11 pages, 4 figures Misprints are corrected and reference list has
been update
Study of the decay in light cone sum rules
The form factors of the decay are
calculated in the framework of the light cone QCD sum rules. In the
calculations the contribution of the negative parity baryon is
eliminated by constructing the sum rules for different Lorentz structures.
Furthermore the branching ratio of the semileptonic decay is calculated. The numerical study for the branching ratio
of the decay indicates that it is quite
large and could be measurable at future planned experiments to be conducted at
LHCb.Comment: 21 pages, 2 figures, LaTeX formatte
Magnetic dipole moments of the heavy tensor mesons in QCD
The magnetic dipole moments of the , and , , and heavy tensor mesons are estimated in framework of
the light cone QCD sum rules. It is observed that the magnetic dipole moments
for the charged mesons are larger than that of its neutral counterpart. It is
found that the flavor symmetry violation is about 10\% in both and
sectors.Comment: 16 pages, 6 figures, LaTeX formatte
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