Charmonium production in pNe collisions at $$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5$$ s NN = 68.5 GeV
Abstract The measurement of charmonium states produced in proton-neon ( $$p\text {Ne}$$ p Ne...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2023
|
| Online Access: | https://hdl.handle.net/1721.1/151164 |
| Summary: | Abstract
The measurement of charmonium states produced in proton-neon (
$$p\text {Ne}$$
p
Ne
) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
J
/
ψ
and
$$\psi {(2S)}$$
ψ
(
2
S
)
mesons is studied with a beam of 2.5
$$\mathrm{\,Te\hspace{-1.00006pt}V}$$
Te
V
protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy
$$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5\mathrm{\,Ge\hspace{-1.00006pt}V} $$
s
NN
=
68.5
Ge
V
. The data sample corresponds to an integrated luminosity of
$$21.7\pm 1.4 $$
21.7
±
1.4
nb
$$^{-1}$$
-
1
. The
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
J
/
ψ
and
$$\psi {(2S)}$$
ψ
(
2
S
)
hadrons are reconstructed in
$$\mu ^+$$
μ
+
$$\mu ^-$$
μ
-
final states. The
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
J
/
ψ
production cross-section per target nucleon in the centre-of-mass rapidity range
$$y^\star \in [-2.29, 0]$$
y
⋆
∈
[
-
2.29
,
0
]
is found to be
$$506 \pm 8 \pm 46 \text { nb/nucleon}$$
506
±
8
±
46
nb/nucleon
. The ratio of
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
J
/
ψ
and
$$D^0$$
D
0
cross-sections is evaluated to
$$(1.06 \pm 0.02 \pm 0.09)\%$$
(
1.06
±
0.02
±
0.09
)
%
. The
$$\psi {(2S)}$$
ψ
(
2
S
)
to
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
J
/
ψ
relative production rate is found to be
$$(1.67 \pm 0.27\pm 0.10)\%$$
(
1.67
±
0.27
±
0.10
)
%
in good agreement with other measurements involving beam and target nuclei of similar sizes. |
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