I have a question; If two particles (let's say protons) collide at high speed, they can produce heavy particles, like the Higgs. My understanding is that the high velocities make the particles more massive, allowing them to produce higher mass particles (relativity). So... If I fly past the particle collision experiment at high speed, perpendicular to the paths of the particles. the particles would appear heavier to me, than to someone standing still relative to the point of impact. Would it be possible for me to observe a higher energy, or more massive outcome to the collision result? Would I just see the same particles, just more massive according to relativity, or could I actually observe a different particle specie outcome? P.S. - It has occured to me that the collision would appear to happen at non-head-on angle for the moving observer, perhaps this changes things as well?