Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hadronic transitions from Upsilon(4S) as a probe of four-quark admixture   It is argued that the observed enhancement of the hadronic transition
Upsilon(4S) -> Upsilon(1S) eta relative to Upsilon(4S) -> Upsilon(1S) pi pi can
be explained if the resonance Upsilon(4S) contains an admixture of a four-quark
component, possibly due to the coupling to the meson channel B \bar B. A test
of the discussed mechanism by searching for the transition Upsilon(4S) ->
Upsilon(1S) eta'(958) is suggested. Some properties of possible four-quark
states related to the suggested one by the heavy quark spin symmetry are also
discussed.

25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys