$${{J}/\psi }$$ J / ψ and $${{D}} ^0$$ D 0 production in $$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5\,\text {GeV} $$ s NN = 68.5 GeV PbNe collisions

Abstract

Abstract The first measurement of

$${{J}/\psi }$$

J / ψ

and

$${{D}} ^0$$

D

0

production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of

$${{J}/\psi }$$

J / ψ

and

$${{D}} ^0$$

D

0

mesons is studied with a beam of lead ions with an energy of 2.5

$$\,\text {TeV}$$

TeV

per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of

$$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5\,\text {GeV} $$

s

NN

= 68.5

GeV

. The

$${{J}/\psi }$$

J / ψ

/

$${{D}} ^0$$

D

0

production cross-section ratio is studied as a function of rapidity, transverse momentum and collision centrality. These data are compared with measurements from

$$p\text {Ne}$$

p Ne

collisions at the same energy and show no difference in the observed

$${{J}/\psi }$$

J / ψ

suppression trend when comparing

$$p\text {Ne}$$

p Ne

and PbNe peripheral collisions with PbNe central collisions.