Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A short comment on OPERA neutrino velocity measuerement   In this report a potential problem in the data analysis of the OPERA
experiment is discussed: the main issue is that the quantity "\partialt" used
in the maximum likelihood procedure is not a "true" parameter of the
parent-distribution (called PDF in the apaper) but a shift in the x-axis (time
scale). This means that the quantity "\partialt" has to be considered only as
systematic effect these error in not simply deducible from a gaussian
distribution as stated.

27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex