Ultraperipheral Collisions: the Feynman diagram 2

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Hello again. Thanks for being so interested!

Last time we saw this:

We also said is that a photon interacts with a Pomeron from the target. Due to something weird called conservation of the quantum numbers (physicists love conserved quantities), we want an object with the same numbers.

The simplest thing that can come to mind is a Vector Meson, look here. Do we see them? Yes.