arXiv subjects
Publications and source records attributed to C. Pajares.
It is shown that the fusion of strings is a source of particle production in nucleus--nucleus collisions outside the kinematical limits of nucleon--nucleon collisions. This fact, together with another effect of string fusion, the reduction of multiplicities, sheds some light on two of the main problems of ultrahigh energy cosmic rays, the chemical composition and the energy of the most energetic detected cosmic rays.
The inclusion of string fusion in Dual Parton Model results in the appearance of diquark-antidiquark pairs in the sea with comparatively large Feynman-$x$. Such antidiquarks can fragment into fast antibaryons, thus increasing several times the corresponding yields in high energy $pp$ collisions for $x_F \sim 0.8 ÷0.9$. String fusion also results in an unusual dependence of inclusive spectra on the multiplicity of secondaries. Some numerical estimations are presented.
We calculate the A-dependence of charm and beauty production cross sections on nuclear targets taking into account the difference of quark and gluon distributions in free nucleons and in nucleus. At comparatively low energies, if $σ\sim A^α$, the value of $α$ is slightly higher than unity. With the growth of the initial energy the value of $α$ decreases and becomes smaller than unity. We also calculate the values of $α$ for different Feynman-$x$ of the produced $Q\overline{Q}$ pair and obtain that they decrease significantly in the beam fragmentation region.
Production of charmed and beauty mesons and baryons in hadron-nucleon collisions at not very high energy is considered in the framework of the Quark-Gluon String Model. We take into account the possible corrections to the model which disappear at asymptotically high energies but could be important at comparatively low energies, essentially in the case of heavy flavour production. The case of nuclear targets is also considered and the $A$-dependence of charmed and beauty hadron yields is calculated. Predictions for the case of beauty hadron production at $\sqrt{s}$ = 39 GeV are presented.