Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hollowness in $pp$ and $p \bar p$ scattering in a Regge model   The proton-proton and proton-antiproton inelasticity profiles in the impact
parameter display very interesting and sensitive features which cannot be
deduced solely from the current large body of high-energy scattering data. In
particular, phenomenological studies exhibit a link between the ratio of the
real to imaginary parts of the elastic scattering amplitude at a finite
momentum transfer, and the corresponding change of character of the inelastic
processes from central to peripheral collisions. We describe how a theoretical
model, accommodating the existing data, based on the Regge hypothesis including
both the Pomeron and odderon as double poles, and $\omega$ and $f$ mesons as
single poles in the complex-$J$ plane, generates a hollow in the inelasticity
at low impact parameters. The hollowness effect, which generally may be
sensitive to model details, does unequivocally take place both for $pp$ and $p
\bar p$ collisions within the applied Regge framework, indicating
inapplicability of inelasticity-folding geometric approaches.

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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: physics