Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large $N_c$ scaling of meson masses and decay constants   We perform an $\textit{ab initio}$ calculation of the $N_c$ scaling of the
low-energy couplings of the chiral Lagrangian of low-energy strong
interactions, extracted from the mass dependence of meson masses and decay
constants. We compute these observables on the lattice with four degenerate
fermions, $N_f=4$, and varying number of colours, $N_c=3-6$, at a lattice
spacing of $a\simeq 0.075$ fm. We find good agreement with the expected $N_c$
scaling and measure the coefficients of the leading and subleading terms in the
large $N_c$ expansion. From the subleading $N_c$ corrections, we can also infer
the $N_f$ dependence, that we use to extract the value of the low-energy
couplings for different values of $N_f$. We find agreement with previous
determinations at $N_c=3$ and $N_f=2, 3$ and also, our results support a strong
paramagnetic suppression of the chiral condensate in moving from $N_f=2$ to
$N_f=3$.

25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat