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We discuss how the mass of new physics particles involved in a pair of shortdecay chains leading to two invisible particles, for example slepton pairproduction, followed by the decay into two leptons and two neutralinos, may bemeasured in central exclusive production (CEP) with forward proton tagging. Weshow how the existing mass measurement strategies in CEP may be improved bymaking full use of the mass-shell constraints, and demonstrate that, witharound 30 signal events, the masses of the slepton and neutralino can bemeasured with an accuracy of a few GeV.

Measuring the masses of a pair of semi-invisibly decaying particles in central exclusive production with forward proton tagging