Trying to understand (E2 - p2c2 = m2c2 )

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I am trying to understand the following equation:
c0d4c02f1c62b2810cf6bfb223120ffb.png

what is P?
 
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p is the normal 3-momentum of the particle.
 
Nabeshin said:
p is the normal 3-momentum of the particle.
thank you Nabeshin
if P is momentum of a particle that already exist
how can this equation explain the create of virtual particle from nothing?
 

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