Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-18
JHEP 1001:004,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version accepted for publication in JHEP. Clarifications added on the assumptions used for plots. New references added
Scientific paper
10.1007/JHEP01(2010)004
We study the potential to observe CP-violating effects in SUSY cascade decay chains at the LHC. We consider squark and gluino production followed by subsequent decays into neutralinos with a three-body leptonic decay in the final step. Asymmetries composed by triple products of momenta of the final state particles are sensitive to CP-violating effects. Due to large boosts these asymmetries can be difficult to observe at a hadron collider. We show that using all available kinematic information one can reconstruct the decay chains on an event-by-event basis even in the case of 3-body decays, neutrinos and LSPs in the final state. We also discuss the most important experimental effects like major backgrounds and momentum smearing due to finite detector resolution. We show that with 300 fb$^{-1}$ of collected data, CP violation may be discovered at the LHC for a wide range of the phase of the bino mass parameter $M_1$.
Moortgat--Pick Gudrid
Rolbiecki Krzysztof
Tattersall Jamie
Wienemann Peter
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