Physics:Punchthrough
From HandWiki
The longitudinal leakage of energy in a hadronic calorimeter. If the calorimeter is sufficiently deep to contain most showers, punchthrough is mostly due to non-interacting forward muons and/or neutrinos. Fluctuations in punchthrough result in low-end tails of measured energy distributions, and affect the resolution ( 
Fesefeldt90a).
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