Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon and $\Delta$ resonances in $\gamma n \to K^+\Sigma^-$
  photoproduction   The most recent data on beam asymmetries, $\Sigma$, and beam-target
asymmetries, $E$, from the CLAS Collaboration, together with the previous data
on differential cross sections and beam asymmetries from the CLAS and LEPS
Collaborations, for the $\gamma n \to K^+\Sigma^-$ reaction are studied based
on an effective Lagrangian approach in the tree-level Born approximation. The
$t$-channel $K$ and $K^\ast(892)$ exchanges, the $u$-channel $\Sigma$ exchange,
the interaction current, and the exchanges of $N$, $\Delta$, and their excited
states in the $s$ channel are considered in constructing the reaction
amplitudes to describe the available experimental data. The reaction mechanisms
of $\gamma n \to K^+\Sigma^-$ are analyzed, and the associated resonances'
parameters are extracted. The numerical results show that the $\Delta$ exchange
and the $N(1710)1/2^+$, $N(1880)1/2^+$, $N(1900)3/2^+$, and $\Delta(1920)3/2^+$
resonance exchanges in the $s$-channel dominate the $\gamma n \to K^+\Sigma^-$
reaction in the lower energy region, and the $t$-channel $K^\ast(892)$ exchange
plays a crucial role at forward angles in the higher energy region.

8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int