Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Total and differential cross sections of the $\boldsymbol{dp\to
  {}^3}\textrm{He}\,\boldsymbol{\eta}$ reaction at excess energies between 1
  and 15 MeV   New high precision total and differential cross sections are reported for the
$dp\to {}^3\textrm{He}\,\eta$ reaction close to threshold. The measurements
were performed using the magnetic spectrometer ANKE, which is an internal fixed
target facility at the COSY cooler synchrotron. The data were taken for
deuteron beam momenta between $3.14641~\textrm{GeV}/c$ and
$3.20416~\textrm{GeV}/c$, which corresponds to the range in excess energy $Q$
for this reaction between $1.14~\textrm{MeV}$ and $15.01~\textrm{MeV}$. The
normalization was established through the measurement in parallel of
deuteron-proton elastic scattering and this was checked through the study of
the $dp\to {}^3\textrm{He}\,\pi^0$ reaction. The previously indicated possible
change of sign of the slope of the differential cross sections near the
production threshold, which could be explained by a rapid variation of the $s$-
and $p$-wave interference term, is not confirmed by the new data. The energy
dependence of the total cross section and the $90^{\circ}$ slope parameter are
well explained by describing the final state interaction in terms of a complex
Jost function and the results are significant in the discussion of $\eta$-mesic
nuclei. In combination with recently published WASA-at-COSY data [P. Adlarson
$et\, al.$, Phys. Lett. B 782, 297 (2018)], a smooth variation of the slope
parameter is achieved up to an excess energy of $80.9~\textrm{MeV}$.

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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
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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: hep-ex
2
The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: q-fin