Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some Comments on the Putative $\Theta^ +$ (1543) Exotic State   We point out that existing $K^+d$ scattering data available in the PDG
(Particle Data Group compilation) suggest some fluctuations in those momentum
bins where the (Fermi motion broadened) $\Theta^+$[1543] resonance recently
indicated in many gamma nuclear reactions and predicted six years ago by
Diakonv Petrov and Polyakov might have shown up. The I=0, $J^P={1/2}^+$ P-wave
channel should have a universal peak cross section of $\sim 37$ mb at
resonance. The smallness of the effect seen in $K^+d$ with the $\delta \sigma $
fluctuations being less than 4 mb imply an indirect bound $\Gamma_{\Theta^+} <
6$ MeV, far stronger than the direct gamma-d measurements. This renders the
theoretical interpretation of the new state very difficult.

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The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys