Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure of a spin 1/2   The non-hermitian states that lead to separation of the four Bell states are
examined. In the absence of interactions, a new quantum state of spin magnitude
1/(root(2) is predicted. Properties of these states show that an isolated spin
is a resonance state with zero net angular momentum, consistent with a point
particle, and each resonance corresponds to a degenerate but well defined
structure. By averaging and de-coherence these structures are shown to form
ensembles which are consistent with the usual quantum description of a spin.

24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
19
The categories of this paper are: eess
2
The categories of this paper are: math
21
The categories of this paper are: adap-org