Guys totally new with third party renderer. Please let me kn0w . They are not visible in render view when using arnold.

set the point @pscale attribute to something like 0.1 and add an "arnold material builder" shader to it. connect a "standard surface" to "output" inside the material builder.

Assign this Arnold material on the obj level and dont forget to add a light + a camera and point it to the particles.

Choose the camera, add an Arnold ROP node and press "Render"