Measurement of antiproton production from antihyperon decays in $${p} \textrm{He}$$ p He collisions at $$\sqrt{s_{\scriptscriptstyle \mathrm NN}} =110$$ s N N = 110 $$\,\text {Ge\hspace{-1.00006pt}V}$$ Ge V
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10052_2023_Article_11673.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Beteta, C. A.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Agapopoulou, C.
Aidala, C. A.
Date Issued
June 27, 2023
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2023 Jun 27;83(6):543
Version
Final published version
Abstract
Abstract
The interpretation of cosmic antiproton flux measurements from space-borne experiments is currently limited by the knowledge of the antiproton production cross-section in collisions between primary cosmic rays and the interstellar medium. Using collisions of protons with an energy of 6.5
$$\,\text {Te\hspace{-1.00006pt}V}$$
Te
V
incident on helium nuclei at rest in the proximity of the interaction region of the LHCb experiment, the ratio of antiprotons originating from antihyperon decays to prompt production is measured for antiproton momenta between 12 and
$$110\,\text {Ge\hspace{-1.00006pt}V\!/}c $$
110
Ge
V\!/
c
. The dominant antihyperon contribution, namely
$${\overline{\varLambda }} \rightarrow {\overline{{p}}} {{\pi } ^+} $$
Λ
¯
→
p
¯
π
+
decays from promptly produced
$$\overline{\varLambda }$$
Λ
¯
particles, is also exclusively measured. The results complement the measurement of prompt antiproton production obtained from the same data sample. At the energy scale of this measurement, the antihyperon contributions to antiproton production are observed to be significantly larger than predictions of commonly used hadronic production models.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-023-11673-x
