2020 Fiscal Year Annual Research Report
Investigation on quantum transport associated with chirality and vorticity in quantum chromodynamics
| Project/Area Number |
20K14470
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| Research Institution | Keio University |
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Principal Investigator |
楊 廸倫 慶應義塾大学, 理工学研究科(矢上), 助教 (90770230)
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| Project Period (FY) |
2020-04-01 – 2021-03-31
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| Keywords | quantum kinetic theory / quark gluon plasma / chiral anomaly / heavy ion collisions / spin polarization |
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| Outline of Annual Research Achievements |
As mentioned in the proposal, we aim at exploring how the chiral anomaly, spin-orbit interaction, and related quantum effects affect “the intertwined charge/spin transport of quark gluon plasma (QGP) and of the pre-equilibrium phase in heavy ion collisions. One of the important purposes is to understand how the spin of quarks and also of gluons are dynamically polarized by vortical or electromagnetic fields and their contributions to experimental observables.
To track dynamical spin polarization particularly triggered by the collisional processes with spin-orbit interaction, it is necessary to modify the standard kinetic theory. By utilizing the Wigner-function approach, we have derived a generic formalism of the quantum kinetic theory (QKT) for massive fermions with quantum corrections in the collision term characterized by self energies, which paves the way to study dynamical spin polarization of a strange quark traversing the QGP. Such a collision term contains the quantum correction led by self-energy gradients, from which the spin polarization could be induced by space-time inhomogeneity of the medium such as local vorticity, as the generalization for side-jump corrections upon massless fermions in the previously derived chiral kinetic theory. In addition to the study of fermions, we have also constructed the QKT for photons, which could be directly generalized to that for weakly coupled gluons. Moreover, we have studied how local vorticity could affect not only spin polarization of hadrons but also the yields for hadrons with different spins.
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[Journal Article] Signatures of the vortical quark-gluon plasma in hadron yields2020
Author(s)
ExHIC-P Collaboration, Hidetoshi Taya, Aaron Park, Sungtae Cho, Philipp Gubler, Koichi Hattori, Juhee Hong, Xu-Guang Huang, Su Houng Lee, Akihiko Monnai, Akira Ohnishi, Makoto Oka, Di-Lun Yang
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Journal Title
Physical Review C
Volume: 102
Pages: 021901(R)
DOI
Peer Reviewed / Int'l Joint Research
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