1,378 research outputs found
Asymptotic regimes for hadron diffractive scatterings and coulomb interaction. Arguments for the black disk mode
Comparative analysis of the interplay of hadron and Coulomb interactions in
scattering amplitudes is performed in a broad energy interval,
TeV, for two extreme cases: for the asymptotic interactions
of hadrons in black disk and resonant disk modes. The interactions are
discussed in terms of the -matrix function technique. In the asymptotic
regime the real part of the hadronic amplitude is concentrated in both cases on
the boundary of the disks in the impact parameter space but the LHC energy
region is not asymptotic for the resonant disk mode that lead to a specific
interplay of hadronic and coulombic amplitudes. For the scattering at
TeV an interplay of the hadron and Coulomb interactions in
the resonant disk modes is realized in a shoulder in
at GeV. The absence of such a shoulder in the
data at 8 TeV can be considered as an argument against the resonant disk mode.Comment: 13 pages, 8 figure
Radiative decays of basic scalar, vector and tensor mesons and the determination of the P-wave q\bar q multiplet
We perform simultaneous calculations of the radiative decays of scalar mesons
f_0(980)-> \gamma\gamma, a_0(980)-> \gamma\gamma, vector meson \phi(1020)->
\gamma f_0(980), \gamma a_0(980), \gamma \pi^0, \gamma \eta, \gamma \eta' and
tensor mesons a_2(1320)-> \gamma\gamma, f_2(1270)-> \gamma\gamma, f_2(1525)->
\gamma\gamma assuming all these states to be dominantly the q\bar q ones. A
good description of the considered radiative decays is reached by using almost
the same radial wave functions for scalar and tensor mesons that supports the
idea for the f_0(980), a_0(980) and a_2(1320), f_2(1270), f_2(1525) to belong
to the same P -wave q\bar q multiplet.Comment: 28 pages, LaTeX, 9 PostScript figures, epsfig.st
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