Speaker
Summary
The review of results on transverse momentum distributions of hyperons that are produced in proton-proton collisions of up-to-date energies reveales a significant change in the slopes of spectra in the region of Pt = 0,3 - 4,0 GeV/c. The spectra of baryons are becoming harder and harder with the energy growth from ISR ($\sqrt{s}$=53 GeV) to RHIC ($\sqrt{s}$=200 GeV) and LHC (0,9 and 7 TeV). The detailed analysis of hyperon spectra, which is analogous to our early studies in the frameworks of Quark-Gluon String Model, demonstrates the change of slopes from $B_0$ = 5,5 (ISR) to $B_0$ = 2,1 (LHC at 7 TeV).
As the result, the average Pt value is growing up to approximately $\sqrt{s}$= 200 GeV and then it goes with the asymptotics ~ $s^{0.05}$. This behavior can not be considered as important change in hadroproduction processes. This statement is very important for cosmic ray physics, where the "knee" (the change in the slope) at $E_{lab}$ $\approx$ 3* $10^{15}$ eV in cosmic proton spectra might have an origin in hadronic interactions. As we have discussed above, nothing drastic happens with baryon spectra up to $\sqrt{s}$ = 7 TeV that corresponds to $E_{lab}= 2,5*10^{16}$ eV. It means that the "knee" can be caused only by an astrophysical reason. On the other hand, the "knee" may indicate, as an example, the maximal energy of protons that are beeing produced in other Galaxies. But the idea of production of very high energy protons in space assumes a futher detailed investigations of the production dynamics of quark systems in the framework of our model. It also seems very intriguing to observe whether or not the average transverse momentum of baryons becomes a constant at futher energies of LHC.
Some brief analysis of growing-with-energy antiparticle-to-particle ratious of elementary particles that are measured in cosmic experiments was done in the QGSM technics. The growing ratios may be explained by the leading behavior of hadron production spectra that is inavitable result of "positiveness" of our Universe. The antimeson-to-meson ratios in cosmic ray physics as well as antibaryon/baryon production asymmetries, which are already measured in LHC experiments, are intended to be discussed in the upcoming publication.
