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

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arxiv 1110.4320 v1 pith:PJGJXBM4 submitted 2011-10-19 hep-ph

classification hep-ph
keywords pairparticlesproductioncentraldecayexclusiveforwardmass
verification ladder T0 review T1 audit T2 compute T3 formal
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We discuss how the mass of new physics particles involved in a pair of short decay chains leading to two invisible particles, for example slepton pair production, followed by the decay into two leptons and two neutralinos, may be measured in central exclusive production (CEP) with forward proton tagging. We show how the existing mass measurement strategies in CEP may be improved by making full use of the mass-shell constraints, and demonstrate that, with around 30 signal events, the masses of the slepton and neutralino can be measured with an accuracy of a few GeV.

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    A new SuperChic Monte Carlo implementation reproduces the ATLAS-observed rate and kinematic dependence of coincident rho meson and dimuon production in ultraperipheral PbPb collisions.

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