Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-mass dijet cross sections in photoproduction at HERA   Dijet differential cross sections for the reaction e+p -> e+ + jet + jet + X
in the photoproduction regime have been measured with the ZEUS detector at HERA
using an integrated luminosity of 42.7 pb**{-1}. The cross sections are given
for photon-proton centre-of-mass energies in the range 134< W <277 GeV. The
differential cross sections as a function of the dijet mass, Mjj, and of the
dijet angular variables have been measured for 47 < Mjj < 160 GeV and compared
to next-to-leading-order QCD calculations. The dijet events in the region 75<
Mjj < 100 GeV have been used to derive a 95% C.L. upper limit on the cross
section for Z0 photoproduction of sigma(e+ p -> e+ Z0 X} < 5.9 pb. Upper limits
on the photoproduction of new heavy resonances decaying into two jets are also
presented for masses in the range between 60 GeV and 155 GeV.

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The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas