Does superhigh-energy cosmic-ray coplanarity contradict LHC data?

Abstract

Abstract One of phenomena observed in cosmic-ray experiments at $$E_0 \gtrsim 10^{16}$$ E0≳1016 eV ($$\sqrt{s} \gtrsim 5$$ s≳5 TeV) is a so-called coplanarity of most energetic subcores of $$\gamma $$ γ -ray–hadron families. This effect requires appearance of some coplanar generation of most energetic particles in hadron-nucleus interactions. To improve research for this phenomenon, a few versions of the new phenomenological FANSY 2.0 model are designed. This model makes it possible to simulate interactions via both traditional and coplanar hadron generation modes. The model reproduces ALICE, ATLAS, CMS, TOTEM data on low-rapidity particle generation, LHCf’s high-$$x_\text {F}$$ xF and high-$$\eta $$ η data on $$\gamma $$ γ -rays and neutron-like hadrons as well as low-energy data on generation of stable and resonance hadrons, light-quark, strange and charmed particles. Features of coplanar particle generation of hadrons at superhigh energies are discussed. A test experiment at the LHC is proposed.