Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of the data on spin density matrix elements for $\gamma p \to
  K^{*+}\Lambda$   In our previous work [Phys. Rev. C {\bf 96}, 035206 (2017)], the
high-precision differential cross-section data for $\gamma p \to K^{*+}\Lambda$
reported by the CLAS Collaboration has been analyzed within an effective
Lagrangian approach. It was found that apart from the $t$-channel $K$, $K^*$,
and $\kappa$ exchanges, the $u$-channel $\Lambda$, $\Sigma$, and $\Sigma^*$
exchanges, the $s$-channel $N$ exchange, and the interaction current, one needs
to introduce at least two nucleon resonances in the $s$ channel in constructing
the reaction amplitudes to describe the cross-section data. One of the needed
resonances is $N(2060)5/2^-$, and the other one could be one of the
$N(2000)5/2^+$, $N(2040)3/2^+$, $N(2100)1/2^+$, $N(2120)3/2^-$, and
$N(2190)7/2^-$ resonances. In this paper, we further include in our analysis
the data on spin density matrix elements for $K^*$ meson reported recently by
the CLAS Collaboration, with the purpose being to impose further constraints on
extracting the resonance contents and to gain a better understanding of the
reaction mechanism. It turns out that with the new data on spin density matrix
elements taken into account, only the set with the $N(2060)5/2^-$ and
$N(2000)5/2^+$ resonances among those five possible solutions extracted from
the analysis of the differential cross-section data can satisfactorily describe
the data on both the differential cross sections and the spin density matrix
elements. Further analysis shows that this reaction is dominated by the
$t$-channel $K$ exchange and $s$-channel $N(2060)5/2^-$ and $N(2000)5/2^+$
exchanges.

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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
5
The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex