Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Paradigm Shifts and a Possible Resolution of the PAMELA-Paradox in
  Astroparticle Physics   Very recently, PAMELA Collaboration has formally reported two sets of data on
positron and antiproton flux measurements done at very high energies and with
unprecedented accuracy. The reports reveal a puzzle of great topical interest
and importance : it is decisively found that there is a sharp smooth rise of
the positron fraction, whereas for antiproton production no such rises occur;
rather the fraction either flattens, or shows signs of falling off gradually
with increasing energies. The present work is just an attempt to decipher the
riddle with the help of a host of radically new ideas about the
particle-structure, the multiparticle-production mechanisms and the concept of
nucleon break-downs into the constituent partons. The application of these
ideas found remarkable successes in the past; exactly similar or more striking
are the findings by the present study.

5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex