Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improved primary vertex finding for collider detectors   Primary vertex finding for collider experiments is studied. The efficiency
and precision of finding interaction vertices can be improved by advanced
clustering and classification methods, such as agglomerative clustering with
fast pairwise nearest neighbor search, followed by Gaussian mixture model or
k-means clustering.

27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
19
The categories of this paper are: eess
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn