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Terminology of rho electroproduction

  1. Jun 13, 2008 #1
    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.
  2. jcsd
  3. Jun 14, 2008 #2


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    on shell means that the particles beeing produced are real particles.
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