Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some Properties of the Very High Q^2 Events of HERA   The kinematic reconstruction of neutral current high Q^2 events at HERA is
discussed in detail using as an example the recently published events of the H1
and ZEUS collaborations at Q^2 > 15000 GeV^2 and M > 180 GeV, which are more
numerous than expected from Standard Model predictions. Taking into account the
complete information of these events, the mass reconstruction is improved and
the difference between the average mass of the samples of the two experiments
is reduced from 26+/-10 GeV to 17+/-7 GeV, but remains different enough to
render unlikely an interpretation of the excess observed by the two
collaborations as originating from the decay of a single narrow resonance.

1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat