How to make particles move irrespective of object(emitter) rotation?

I have a particle system attached to the rolling sphere. When sphere meets certain condition on the game it is made to emit the particle system. I have directed the particle emission to the left side of the screen. However, due to the rotation of the sphere the particle system are scattered to the rotated direction.

How to emit the particle only on left direction of the screen?

You should not put your sphere mesh and particle system components in the same object, or parenting the particle system to sphere mesh object.

Instead parent both sphere and particle sys under the same object but it only rotate the sphere object, so the rotation of particle emitter remains independent to the sphere.