Nugatory said:
The question cannot arise because you cannot observe virtual particles - if you could, they wouldn't be virtual.
I was careful to restrict "observation" to the case of real pairs. The purpose of mentioning the real pairs was to establish the idea of the geometric locations of the point of separation and COM of the real pair, in preparation for asking about the analogous values or relations of the math artifacts.
The question can arise because I am asking something about the math of virtual particles, not observations of them. I am asking if when the virtual particles arise in the math, does the model give them an attribute of a point of origin (a separation point from which they emerge) and whether that point of origin may have an attribute of velocity allowing the geometric line between the virtual pair to not cross their point of origin... this has nothing to do with experiments or observation or their existential reality; only asking at a very high level if the artifacts in the math have these kind of modeled properties in the math itself.
The "Properties" section of the Wikipedia entry for Virtual particle includes these phrases:
"Virtual particles occur in combinations..."
"...appear to occur close to one another in time..."
"...calculated in terms of exchanges of virtual particles..."
"...four-momentum q..."
"...kinetic energy may not have the usual relationship to velocity–indeed, it can be negative"
"...virtual particles of larger mass..."
These suggest that the math includes some aspects of location, time, distance, velocity, mass, momentum, kinetic energy, and mass, perhaps different than their classical counterparts but still acting as values and relations in the model. Clearly none of these are observed, but the math is using these to model something and it seems that these properties must answer about how the model itself represents the pairs conceptually geometrically.
