Anomalous pion production induced by nontrivial topological structure of QCD vacuum

Abstract

A new mechanism for the pion production in the high energy reactions is suggested. It is related to the possibility for direct production of the pions induced by instantons, topologically nontrivial gluonic excitations of QCD vacuum. This mechanism does not require any fragmentation functions for production of pseudoscalar mesons in high energy reactions with hadrons. We calculate the contribution of a new mechanism to the inclusive ${\pi }^0$-meson production in high energy proton-proton collision. It is shown that it gives the dominated contribution to the inclusive cross-sections in the few GeV region for the transverse momentum of final pion. We discuss the possible application of a new mechanism to the phenomenon of the large spin effects observed in the numerous high energy reactions.

5 pages, 4 figures, final version published in Phys.Rev.D92,034025 (2015)

References in corpus (4)

• Forward Neutral Pion Production in p+p and d+Au Collisions at sqrt(s_NN)=200 GeV
• Production of Mesons and Baryons at High Rapidity and High Pt in Proton-Proton Collisions at sqrt(s) = 200 GeV
• Puzzles in Hadronic Physics and Novel Quantum Chromodynamics Phenomenology
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Cited by in corpus (6)

• Gluonic Structure of the Constituent Quark
• Non-perturbative collisional energy loss of heavy quarks in quark-gluon plasma
• Single-spin asymmetries in SIDIS induced by anomalous gluon-quark and photon-quark couplings
• Parton distributions and $\cos 2{\varphi }_h$ asymmetry induced by anomalous photon-quark coupling
• Instanton induced transverse single spin asymmetry for ${\pi }^0$ production in $pp$-scattering
• Gluonic Distribution in the Constituent Quark and Nucleon Induced by the Instantons