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Long-lived charged massive particles (CHAMPs) appear in various particlephysics models beyond the Standard Model. In this Letter, we discuss theprospects for studying the stopping and decaying events of such long-livedCHAMPs at the LHC detectors, and show that the lifetime measurement (and thestudy of decay products) is possible with the LHC detectors for a wide range ofthe lifetime O(0.1)-O(10^{10}) sec, by using periods of no $pp$ collision. Evena short lifetime of order one second can be measured by (i) identifying thestopping event with the online Event Filter, (ii) immediately making abeam-dump signal which stops the $pp$ collision of the LHC, and at the sametime (iii) changing the trigger menu to optimize it for the detection of aCHAMP decay in the calorimeter. Other possibilities are also discussed.

Measuring lifetimes of long-lived charged massive particles stopped in LHC detectors