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## Main Question or Discussion Point

Dear Forum,

I am trying to learn more about the electroproduction of rho meson off proton.

e + p -> e + p + rho

One of the commonly used kinematic variable is tprime, defined as t-tmin.

The definition I could find for tmin is that it is the minimal value of t kinematically

necessary to put rho and proton system on shell.

However I still do not know how it is calculated and what does 'putting the system

on shell' mean. More explanation will be greatly appreciated. Thanks for any response

you might have.

I am trying to learn more about the electroproduction of rho meson off proton.

e + p -> e + p + rho

One of the commonly used kinematic variable is tprime, defined as t-tmin.

The definition I could find for tmin is that it is the minimal value of t kinematically

necessary to put rho and proton system on shell.

However I still do not know how it is calculated and what does 'putting the system

on shell' mean. More explanation will be greatly appreciated. Thanks for any response

you might have.