Random question. Would shining a laser at a collision between particles let you observe anything you wouldn't be able to otherwise? For example, would any of the created particles absorb or reflect this light enough to be observable before decay? I'm assuming that it would be, at best, of only limited use. Possible reasons include: Size of particles making them difficult to detect, some particles not interacting with EM radiation, detectors being drowned out by radiation from the collision, damage to detectors from high energy particles, required wavelength probably being in the x-ray to gamma range, and similar difficulties.