Open charm production and asymmetry in pNe collisions at √sNN = 68.5 GeV
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10052_2023_Article_11641.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Afsharnia, H.
Agapopoulou, C.
Date Issued
June 27, 2023
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2023 Jun 27;83(6):541
Version
Final published version
Abstract
Abstract
A measurement of
$${{D}} ^0$$
D
0
meson production by the LHCb experiment in its fixed-target configuration is presented. The production of
$${{D}} ^0$$
D
0
mesons is studied with a beam of 2.5
$$\,\text {Te\hspace{-1.00006pt}V}$$
Te
V
protons colliding on a gaseous neon target at rest, corresponding to a nucleon–nucleon centre-of-mass energy of
$$\sqrt{s_{\scriptscriptstyle \text {NN}}} = 68.5\,\,\text {Ge\hspace{-1.00006pt}V} $$
s
NN
=
68.5
Ge
V
. The sum of the
$${{D}} ^0$$
D
0
and
$${\hspace{0.0pt}\overline{\hspace{0.0pt}{D}}} {}^0$$
D
¯
0
production cross-section in
$$p\text {Ne}$$
p
Ne
collisions in the centre-of-mass rapidity range
$$y^{\star }\in [-2.29, 0]$$
y
⋆
∈
[
-
2.29
,
0
]
is found to be
$$\sigma _{D^{0}}^{y^\star \in [-2.29, 0]} = 48.2 \pm 0.3 \pm 4.5 \,\upmu \text {b}/\text {nucleon}$$
σ
D
0
y
⋆
∈
[
-
2.29
,
0
]
=
48.2
±
0.3
±
4.5
μ
b
/
nucleon
where the first uncertainty is statistical and the second is systematic. The
$${{{D}} ^0}-{{\hspace{0.0pt}\overline{\hspace{0.0pt}{D}}} {}^0} $$
D
0
-
D
¯
0
production asymmetry is also evaluated and suggests a trend towards negative values at large negative
$$y^{\star }$$
y
⋆
. The considered models do not account precisely for all the features observed in the LHCb data, but theoretical predictions including 1
$$\%$$
%
intrinsic charm and 10
$$\%$$
%
recombination contributions better describe the data than the other models considered.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-023-11641-5
