Multiplicity of photohadronization and photon–hadron scaling violation

Abstract

The method of scaling transformations permitting to carry out the reconstruction of cross sections of γN and γγ interactions on the basis of cross sections of nucleon-(anti)nucleon interactions is suggested. The photon-hadron scaling violation is a consequence of dependence of scaling transformation parametern(s) on the energy. The universal functionn(s) is interpreted as the multiplicity of photohadronization. This function is established by processing the data on γp cross sections in the low energy region √ s < 20 GeV and is extrapolated to the high energy region up to √ s ∼ 200 GeV. The results of the reconstruction of γN cross sections at high energies and of γγ ones at all energies are in a remarkable agreement with available experimental data.

On the mass composition of primary cosmic rays in the energy region 1015–1016eV

“…In papers [16][17][18] we developed the method of recalculation from the multiplicity spectrum to the EAS spectrum versus the total number of muons, I(n μ ). The formulation of the task is the following: let F (m) be the integral multiplicity spectrum obtained at a certain facility.…”

“…The numerical values of parameters (m) and G(m) calculated in [17,18] with regard to the real structure of the facility are presented in table 2. N( m) is the experimental number of events with the muon multiplicity m [15].…”

“…To determine the regions of B j , which satisfy the relations (17) we shall make the mass composition heavier (or lighter) B in → B cur until the result R × B cur = J cur fall outside the limits The conditions…”

Total photoproduction cross section at very high energy

“…The use of a simple multiplicative factor to compare the photon processes with each other and with the pure proton processes, is the simplest form of factorization. More complex forms of factorization exist in the literature, as in a recent formulation by Vereshkov and collaborators [23] or as in the model by Block et al (also called the Aspen model) [24]. More comments shall follow in the last section.…”