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arXiv · 2001.07638

Tensor supercurrent in QCD

Alexander S. Gorsky·Dmitri E. Kharzeev
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Abstract

An external Abelian magnetic field excites in the QCD vacuum a tensor supercurrent that represents the tensor polarization of the chiral condensate. This tensor supercurrent can be deduced from the chiral lagrangian in the presence of anomalies; a similar tensor supercurrent emerges in rotating systems at finite chemical potential. We discuss the microscopic origin of this supercurrent and argue that it screens the instanton--anti-instanton $I\bar{I}$ molecules in the QCD vacuum, similarly to the vector supercurrent screening Abrikosov vortices in a superconductor. A number of possible experimental manifestations of the tensor supercurrent are discussed: {\it i}) spin alignment of axial-vector and vector mesons in heavy ion collisions; {\it ii}) tensor charge of the nucleon; {\it iii}) transversity of quark distributions in polarized nucleons.

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Alexander S. Gorsky, Dmitri E. Kharzeev. 2020-01-21. Tensor supercurrent in QCD. https://doi.org/10.1103/physrevd.101.114002

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