Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finite size effects on $M_\pi$ in QCD from Chiral Perturbation Theory   We present a determination of the shift $M_\pi(L)-M_\pi$ due to the finite
spatial box size $L$ by means of $N_f=2$ Chiral Perturbation Theory and
L\"uscher's formula. The range of applicability of the chiral prediction is
discussed.

9
The categories of this paper are: nlin
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex