We suggest a new mechanism of the inclusive production of pions in high energy reactions, also knows as anomalous pion production (APP) since the formation of the pions happens at short distances due to instantons whi...We suggest a new mechanism of the inclusive production of pions in high energy reactions, also knows as anomalous pion production (APP) since the formation of the pions happens at short distances due to instantons which have a much smaller size in comparison with the confinement scale. Furthermore, in our approach it is not needed to include in the calculation any fragmentation functions which are related to the hadronization and, therefore, to the confinement dynamics. As the result, the value of the inclusive pion cross section is determined by the structure of the short range fluctuations of gluonic fields in the QCD vacuum. This mechanism breaks the pQCD factorization and might be a corner stone of various phenomena observed in high energy reactions in the few GeV range for the transfer momentum.展开更多
Based on both the constituent quark picture and the instanton model for QCD vacuum, we calculate the unpolarized and polarized gluon distributions in the constituent quark and in the nucleon. Our approach consists of ...Based on both the constituent quark picture and the instanton model for QCD vacuum, we calculate the unpolarized and polarized gluon distributions in the constituent quark and in the nucleon. Our approach consists of two main steps. At the first step, we follow the Altarelli-Parisi (AP) approach[1] to calculate the gluon distributions inside the constituent quark generated by the perturbative quark-gluon interaction, the non-perturbative quarkgluon interaction, and the non-perturbative quark-gluon-pion anomalous chromomagnetic interaction. The nonperturbative interactions are related to the existence of the instantons, strong topological fluctuations of gluon fields, in the QCD vacuum. At the second step, the convolution model is applied to derive the gluon distributions in the nucleon.展开更多
文摘We suggest a new mechanism of the inclusive production of pions in high energy reactions, also knows as anomalous pion production (APP) since the formation of the pions happens at short distances due to instantons which have a much smaller size in comparison with the confinement scale. Furthermore, in our approach it is not needed to include in the calculation any fragmentation functions which are related to the hadronization and, therefore, to the confinement dynamics. As the result, the value of the inclusive pion cross section is determined by the structure of the short range fluctuations of gluonic fields in the QCD vacuum. This mechanism breaks the pQCD factorization and might be a corner stone of various phenomena observed in high energy reactions in the few GeV range for the transfer momentum.
文摘Based on both the constituent quark picture and the instanton model for QCD vacuum, we calculate the unpolarized and polarized gluon distributions in the constituent quark and in the nucleon. Our approach consists of two main steps. At the first step, we follow the Altarelli-Parisi (AP) approach[1] to calculate the gluon distributions inside the constituent quark generated by the perturbative quark-gluon interaction, the non-perturbative quarkgluon interaction, and the non-perturbative quark-gluon-pion anomalous chromomagnetic interaction. The nonperturbative interactions are related to the existence of the instantons, strong topological fluctuations of gluon fields, in the QCD vacuum. At the second step, the convolution model is applied to derive the gluon distributions in the nucleon.
