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
The electronic and transport characteristics of protonated derivatives of naphthalocyanine(Nc)were investigated using density functional theory and non-equilibrium Green's functions.The results indicate that the p...The electronic and transport characteristics of protonated derivatives of naphthalocyanine(Nc)were investigated using density functional theory and non-equilibrium Green's functions.The results indicate that the protonation of external meso-N atoms of Nc preserves its planar structure and is energetically more favorable than the protonation of internal isoindole-N atoms.The protonation shifts the energy levels of system's frontier molecular orbitals closer to the Fermi level,thus creating channels for electron transport.In contrast with the semiconductor transport properties of H2Nc,its protonation products respond more sensitively to bias and exhibit negative differential resistance phenomena at specific bias.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.
基金supported by the Postgraduate Inovation Programme of Changchun Wormal University(YJSCX202424)the Science and Technology Project of Jilin Provincial Education Department(JJKH20220828KJ)the Natural Science Foundation of Changchun Normal University(2020-005).
文摘The electronic and transport characteristics of protonated derivatives of naphthalocyanine(Nc)were investigated using density functional theory and non-equilibrium Green's functions.The results indicate that the protonation of external meso-N atoms of Nc preserves its planar structure and is energetically more favorable than the protonation of internal isoindole-N atoms.The protonation shifts the energy levels of system's frontier molecular orbitals closer to the Fermi level,thus creating channels for electron transport.In contrast with the semiconductor transport properties of H2Nc,its protonation products respond more sensitively to bias and exhibit negative differential resistance phenomena at specific bias.
