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- Title
On the Dominant Role of Charm Production in the Forward Kinematic Region According to Cosmic-Ray Experiments.
- Authors
Borisov, A. S.; Denisova, V. G.; Galkin, V. I.; Guseva, Z. M.; Kanevskaya, E. A.; Kogan, M. G.; Mukhamedshin, R. A.; Nazarov, S. I.; Puchkov, V. S.; Sadykov, T.
- 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 σ p p → c c ¯ ∼ 8 at xLab ≳ 0.1 at ⟨ELab⟩ ∼ 75 TeV. This σ p p → c 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.
- Subjects
TIEN Shan; PAMIR; COSMIC ray showers; COSMIC rays; AIR gap (Engineering); HADRONS
- Publication
Physics of Atomic Nuclei, 2019, Vol 82, Issue 6, p827
- ISSN
1063-7788
- Publication type
Article
- DOI
10.1134/S1063778819660098