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Let's consider two separate things: The mass (i.e. rest mass) of anything doesn't depend on its relative motion to an observer (i.e. is Lorentz invariant). For a proton, $m_p\simeq 1\,\text{GeV}/c^2$. The energy (occasionally egregiously called mass or relativistic mass in old-fashioned sources) of an object isn't Lorentz invariant. In the future, the LHC ...


I'm not actually a high-energy guy, and my knowledge of jets is all second hand, but I did do a graduate summer school on the topic one year. If I recall correctly... Jet energy is the total energy of particles making up the jet. Jet energy resolution is the experimental limit on how well that quantity can be known. You'll note that both of these ...

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