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Solutions to Exercises
Solutions to Exercises 273 Consider two particles with energy and momentum four vectors p1 and p2. Thesymbolpi standsforthefour-vector{Ei,cpi}.TheenergyEappearinginthis expression is the total energy E, i.e. the rest energy mc2 plus the kinetic energy. The four-vector product (p1.p2) is defined as(p1.p2) =E1E2 −c 2 p 1 p2 A four-vector product is a Lorentz invariant; this quantity …
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