Abstract
A phenomenon of abnormally weak absorption of very-high-energy cosmic-ray hadrons in lead is discussed. This phenomenon was first observed in Tien-Shan high-altitude experiments in hadronic cores of extensive air showers and has encouraged to introduce the hypothesis of a so-called long-flying or penetrating cosmic-ray component. A similar effect was detected later with deep uniform lead X-ray emulsion chambers (XREC) at the Pamirs. Experiments, which are sensitive to the production of charmed hadrons in the forward kinematic region (xLab ≳ 0.1), have been carried out at the Tien-Shan and Pamirs with exposing two-storey XRECs with large air gaps to prove explanation of the experimental results with high charm production cross section \({\sigma _{pp \to c\bar c}} \sim 8\) at xLab ≳ 0.1 at ⟨ELab⟩ ∼ 75 TeV. This \({\sigma _{pp \to c\bar c}}\) value makes it possible to reproduce the experimental hadron-absorption curve observed with XRECs, including curve’s bending at a depth of ∼70 c.u.
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Funding
The work was partially supported by the project no. BR05236291 of Ministry of Education and Science of Kazakhstan Republic.
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Borisov, A.S., Denisova, V.G., Galkin, V.I. et al. On the Dominant Role of Charm Production in the Forward Kinematic Region According to Cosmic-Ray Experiments. Phys. Atom. Nuclei 82, 827–833 (2019). https://doi.org/10.1134/S1063778819660098
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DOI: https://doi.org/10.1134/S1063778819660098