3,551 research outputs found
Strong and vertices from QCD light-cone sum rules
The strong and
vertices are studied and the relevant couplings are calculated in the context
of the light-cone QCD sum rule method with twist-4 accuracy by including the
next-to-leading order corrections. In the analysis, both the quark and gluon
components of the and mesons and the axial anomaly
corrected higher twist distributions are included.Comment: 15 Pages and 6 Figure
Charmed partner of the exotic state and its properties
The mass, decay constant and width of a hypothetical charmed partner of
the newly observed exotic state are calculated using a technique of
QCD sum rule method. The state with
is described employing two types of the diquark-antidiquark
interpolating currents. The evaluation of the mass and decay constant
is carried out utilizing the two-point sum rule method by including
vacuum condensates up to eight dimensions. The widths of the decay channels
and are also found. To this
end, the strong couplings and are computed
by means of QCD sum rules on the light-cone and soft-meson approximation.Comment: 7 Pages, 2 Figures and 3 Table
Strong decays in QCD
The widths of the strong decays and
are calculated. To this end, the mass and
decay constant of the exotic state are computed by means of a
two-point sum rule. The obtained results are then used to calculate the strong
couplings and employing QCD
sum rules on the light-cone supplied by a technique of the soft-meson
approximation. We compare our predictions on the mass and decay widths with
available experimental data and other theoretical results.Comment: 11 Pages, 3 Figures and 2 Tables; To be published by Physical Review
Width of the exotic state through its strong decay to
The width of the newly observed exotic state is calculated via
its dominant strong decay to using the QCD sum rule method
on the light-cone in conjunction with the soft-meson approximation. To this
end, the vertex is studied and the strong coupling
is computed employing for state the
interpolating diquark-antidiquark current of the
type. The obtained prediction for the decay
width of is confronted and a nice agreement found with the
experimental data of the D0 Collaboration.Comment: 6 Pages, 2 Figures and 1 Tabl
Mass and decay constant of the newly observed exotic state
The mass and decay constant of the state newly observed by D0
Collaboration are computed within the two-point sum rule method using the
diquark-antidiquark interpolating current. In calculations, the vacuum
condensates up to eight dimensions are taken into account. The obtained result
for the mass of the state is in a nice agreement with the
experimental data.Comment: 5 Pages, 2 Figures and 1 Table; To be published in Phys. Rev. D.
arXiv admin note: text overlap with arXiv:1601.0384
Application of the QCD light cone sum rule to tetraquarks: the strong vertices and
The full version of QCD light-cone sum rule method is applied to tetraquarks
containing a single heavy or quark. To this end, investigations of the
strong vertices and are performed, where
and are the exotic states
built of four quarks of different flavors. The strong coupling constants
and corresponding to these vertices
are found using the -meson leading and higher-twist distribution
amplitudes. In the calculations and are treated as scalar bound
states of a diquark and antidiquark.Comment: 10 Pages, 5 Figures and 1 Tabl
Exploring as a meson molecule
The parameters, i.e. the mass and current coupling of the exotic
state observed by the D0 Collaboration as well as the decay width of the
process are explored using molecule
assumption on its structure. Employed computational methods include QCD
two-point and light-cone sum rules, latter being considered in the soft-meson
approximation. The obtained results are compared with the data of the D0
Collaboration as well as with the predictions of the diquark-antidiquark model.
This comparison strengthens a diquark-antidiquark picture for the
state rather than a meson molecule structure.Comment: 7 Pages, 2 Figures and 1 Tabl
Investigation of the semileptonic transition of the into the orbitally excited charmed tensor meson
The transition form factors of the semileptonic decay channel are calculated
within the framework of the three-point QCD sum rules. The fit functions of the
form factors are then used to estimate the total decay width and branching
ratio of this transition. The order of branching ratio shows that this channel
can be detected at LHCb.Comment: 15 Pages, 4 Figures and 5 Table
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