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Are there fermionic bound states that are gauge neutral to all gauge forces?

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Puzzle: In our standard model particle physics, are there fermionic bound states that are gauge neutral to all gauge forces?

Here we concern strong SU(3) color, electromagnetic U(1) EM, hyper U(1), and weak SU(2) forces.

It looks that a single neutron (with 3 quarks $uud$) is a bound state, neutral under electric force and strong force. But from the post Are Neutrons gauge neutral to all gauge forces?

the neutron has a magnetic moment so interacted with magnetic field. (This is a bit strange to me, since we can boost the Lorentz force, which can mix electric and magnetic field. So after boosting the reference frame, the electric neutral neutron can also be electric non-neutral interacting with electric field???)
the neutron also carries weak charge (how much?)

Are there possible candidates of fermionic bound states that are gauge neutral to all gauge forces?

This post imported from StackExchange Physics at 2020-11-28 23:02 (UTC), posted by SE-user annie marie heart

asked Apr 1, 2020 in Theoretical Physics by annie marie heart (1,205 points) [ no revision ]

No such particles. As for magnetic moments, linked. Have you studied neutral electric dipoles?

This post imported from StackExchange Physics at 2020-11-28 23:02 (UTC), posted by SE-user Cosmas Zachos

commented Apr 1, 2020 by Cosmas Zachos (370 points) [ no revision ]

Does the right handed neutron as a bound state count as gauge neutral to all gauge forces?? $u_Rd_Rd_R$, suppose that the Higgs condensate is zero (so right handed [SU(2) singlet] quarks cannot be paired to the left handed [SU(2) doublet] via mass term.]

This post imported from StackExchange Physics at 2020-11-28 23:02 (UTC), posted by SE-user annie marie heart

commented Apr 1, 2020 by annie marie heart (1,205 points) [ no revision ]

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