Particle rapidity distribution in proton-nucleus collisions using the proton-contributor reference frame

Understand

I define the proton-contributor reference frame in proton nucleus (p--A) collisions as the center of mass of the system formed by the proton and the participant nucleons of the nucleus.

• Assuming that the rapidity distribution of produced particles is symmetric in the proton-contributor reference frame, several measurements in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02 {\rm TeV}$ can be described qualitatively.
• These include rapidity distributions of charged particles, $J/\psi$ and Z bosons.