Question

positron / electron annihilation - where is the invariant?

Answer 1

 a quantity is called "a Lorentz invariant" or "a Lorentz scalar"if that quantity doesn't change under a boost. Masses and intervals are examples of invariants as are any other quantities that can be written as the inner product of two four-vectors. This is different from energy being conserved in a interaction (which is true in all frames as well, but the value of the energy differs from frame to frame). I don't quite understand what you are being asked to do, as the solution you exhibit is (up to the missing + in the last line) what I would do. 

Answer 2

$<marquee>{Hello Friend}$

The answer of u r question is..✌️✌️

✨ positron are electron annihilation where is the invariant??✨

Ans:✍️✍️✍️✍️✍️✍️✍️✍️

✔️✔️ positron and electron of same and there positive electron are headed to each other and they both contain kinetic energy has equal to equal . in warrant has been seen both in positron are electron..✔️✔️

Thank you..⭐️⭐️⭐️⭐️