Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phenomenological mass relation for free massive stable particles and
  estimations of neutrino and graviton masses   The ratio between the proton and electron masses was shown to be close to the
ratio between the shortest lifetimes of particles, decaying by the
electromagnetic and strong interactions. The inherent property of each
fundamental interaction is defined, namely the Minimal lifetime of the
interaction (MLTI). The rest mass of the Lightest free massive stable particle
(LFMSP), acted upon by a particular interaction, is shown to be inversely
proportional to MLTI. The found mass relation unifies the masses of four stable
particles of completely different kinds (proton, electron, electron neutrino
and graviton) and covers an extremely wide range of values, exceeding 40 orders
of magnitude. On the basis of this mass relation, the electron neutrino and
graviton masses have been approximately estimated to 6.5x10^(-4) eV/c^2 and
H*h_bar/c^2 = 1.5x10^(-33) eV/c^2, respectively. Besides, the last value has
been obtained independently by dimensional analysis by means of the fundamental
parameters speed of light (c), reduced Planck constant (h_bar) and Hubble
distance (H). It was shown that the equivalent energy of LFMSP, acted upon by a
particular interaction, is close to Breit-Wigner's energy width of the shortest
living state, decaying by the respective interaction.

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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org