A fight is a violent confrontation between individuals or groups, often with serious intent to harm, while a scuffle is a brief, disorderly struggle, typically less severe and more spontaneous.
In the rest frame of the particle,\nucoincides with the componentq^0of the photon momentum. Cottingham [2] observed that the time-ordered amplitude is analytic inq^0and that the path of integration over this variable may be rotated into the imaginary axis, at fixed three momentum\varvec{q...