Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the hadron mass decomposition   We argue that the standard decompositions of the hadron mass overlook
pressure effects, and hence should be interpreted with great care. Based on the
semiclassical picture, we propose a new decomposition that properly accounts
for these pressure effects. Because of Lorentz covariance, we stress that the
hadron mass decomposition automatically comes along with a stability
constraint, which we discuss for the first time. We show also that if a hadron
is seen as made of quarks and gluons, one cannot decompose its mass into more
than two contributions without running into trouble with the consistency of the
physical interpretation. In particular, the so-called quark mass and trace
anomaly contributions appear to be purely conventional. Based on the current
phenomenological values, we find that in average quarks exert a repulsive force
inside nucleons, balanced exactly by the gluon attractive force.

29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
2
The categories of this paper are: math