APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Ryutaro Matsudo (KEK)
Title: Vector mesons on the wall
Date (JST): Wed, Feb 24, 2021, 13:30 - 14:30
Place: Zoom
Related File: 2644.pdf
Abstract: We show that the effective theory for pions and $\eta'$ is inconsistent with a mixed anomaly involving the $\theta$-periodicity and the global symmetry unless there is a dynamical domain wall on which a $U(N_f)_{-N_ c}$ Chern-Simons theory is supported. When the domain wall has a boundary, we conclude that there should be a boundary term that couples the $U(N_f)_{-N_c}$ gauge field to the vector mesons. We also confirm that the recent proposal that the domain wall bounded by the string describes the baryon with spin $N_c/2$ by determining the coupling of the background gauge fields to the wall. We discuss the impact on physics of the chiral phase transition and the relation to the ``duality'' of QCD. This talk is based on the paper arXiv:2011.14637.