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2015

Exploring a new SU(4) symmetry of meson interpolators

Glozman, L. Ya., Pak, M.

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In recent lattice calculations it has been discovered that mesons upon truncation of the quasi-zero modes of the Dirac operator obey a symmetry larger than the $SU(2)_L \times SU(2)_R\times U(1)_A$ symmetry of the QCD Lagrangian.

This symmetry has been suggested to be $SU(4) \supset SU(2)_L \times SU(2)_R\times U(1)_A$ that mixes not only the u- and d-quarks of a given chirality, but also the left- and right-handed components.
Here it is demonstrated that bilinear $\overline{q}q$ interpolating fields of a given spin $J \geq 1$ transform into each other according to irreducible representations of $SU(4)$ or, in general, $SU(2N_F)$.
This fact together with the coincidence of the correlation functions establishes $SU(4)$ as a symmetry of the $J \geq 1$ mesons upon quasi-zero mode reduction.

Exploring a new SU(4) symmetry of meson interpolators · Around

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