AbstractWe report on the inclusive $$\text {J}/\psi $$
J
/
ψ
production cross section measured at the CERN Large Hadron Collider in proton–proton collisions at a center-of-mass energy $$\sqrt{s}~=~13$$
s
=
13
TeV. The $$\text {J}/\psi $$
J
/
ψ
mesons are reconstructed in the $$\text {e}^{+}\text {e}^{-}$$
e
+
e
-
decay channel and the measurements are performed at midrapidity ($$|y|<0.9$$
|
y
|
<
0.9
) in the transverse-momentum interval $$0<p_{\mathrm{T}} <40$$
0
<
p
T
<
40
GeV/$$c$$
c
, using a minimum-bias data sample corresponding to an integrated luminosity $$L_{\text {int}} = 32.2~\text {nb}^{-1}$$
L
int
=
32.2
nb
-
1
and an Electromagnetic Calorimeter triggered data sample with $$L_{\text {int}} = 8.3~\mathrm {pb}^{-1}$$
L
int
=
8.3
pb
-
1
. The $$p_{\mathrm{T}}$$
p
T
-integrated $$\text {J}/\psi $$
J
/
ψ
production cross section at midrapidity, computed using the minimum-bias data sample, is $$\text {d}\sigma /\text {d}y|_{y=0} = 8.97\pm 0.24~(\text {stat})\pm 0.48~(\text {syst})\pm 0.15~(\text {lumi})~\mu \text {b}$$
d
σ
/
d
y
|
y
=
0
=
8.97
±
0.24
(
stat
)
±
0.48
(
syst
)
±
0.15
(
lumi
)
μ
b
. An approximate logarithmic dependence with the collision energy is suggested by these results and available world data, in agreement with model predictions. The integrated and $$p_{\mathrm{T}}$$
p
T
-differential measurements are compared with measurements in pp collisions at lower energies and with several recent phenomenological calculations based on the non-relativistic QCD and Color Evaporation models.
Measurement of the ttbar production cross section in the fully hadronic decay channel in pp collisions at 7 TeV
