Can a particle with both positive and negative charge exist?

[DonGoucher]

is the exsistance of a new subatomic particle (i.e. electron, proton, neutron) possible is said particle is able to carry a positive and a negative electrical field? (+-)==<|> ==
say if the particle emits energy that can push and "pull" in all directions can it in theory stop energy and other particles?

 

[mathman]

No such particle is known to exist.

 

[Drakkith]

Also, I just wanted to point out that "emitting energy" and "stopping energy" is not possible by anything. Energy isn't a "thing", it refers to the ability for an object to influence and change another object. AKA Work. The means to do this exists in fields such as the electromagnetic field that will repel or attract charged particles.