Boosted Semileptonic Tops in Stop Decays
Tilman Plehn, Michael Spannowsky, Michihisa Takeuchi
TL;DR
This paper presents a novel method for reconstructing boosted semileptonic top quarks in stop decays at the LHC, improving background suppression and enabling stop mass measurement using the M_{T2} endpoint.
Contribution
It introduces a new technique for reconstructing boosted leptonic tops and measuring stop masses, challenging previous assumptions about the difficulty of semileptonic top searches.
Findings
Background reduced to manageable levels
Stop mass determined via M_{T2} endpoint
Method enhances semileptonic top search prospects
Abstract
Top partner searches are one of the key aspects of new physics analyses at the LHC. We correct an earlier statement that supersymmetric top searches based on decays to semileptonic tops are not promising. Reconstructing the direction of the boosted leptonic top quark and correlating it with the measured missing transverse energy vector allows us to reduce the top pair background to an easily manageable level. In addition, reconstructing the full momentum of the leptonic top quark determines the stop mass based on an M_{T2} endpoint.
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