215 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
Central production of lepton-antilepton pairs and heavy quark composite states in hadron diffractive collisions at ultrahigh energies
Central production of lepton-lepton pairs ( and ) and
heavy quark composite states (charmonia and bottomonia) in diffractive proton
collisions (proton momenta transferred ) are
studied at ultrahigh energies (), where
with 1\la N\la 2. The -rescattering
corrections, which are not small, are calculated in terms of the -matrix
approach modified for ultrahigh energies. Two versions of hadron interactions
are considered in detail: the growth (i) ,
within the black disk mode and (ii)
, within the
resonant disk mode. The energy behavior of the diffractive production processes
differs strongly for these modes, thus giving a possibility to distinguish
between the versions of the ultrahigh energy interactions.Comment: 10 pages. arXiv admin note: substantial text overlap with
arXiv:1408.069
Non-strange and strange pentaquarks with hidden charm
Non-strange and strange pentaquaks with hidden charm are considered as
diquark-diquark-antiquark composite systems. Spin and isospin content of such
exotic states is discussed and masses are evaluated.Comment: 8 page
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