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Momentum reconstruction at the LHC for probing CP violation in the stop sector

G. Moortgat-Pick1,3,*, K. Rolbiecki2,3,†, and J. Tattersall2,4,‡

  • 1II. Institut für Theoretische Physik, University of Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
  • 2IPPP, University of Durham, Durham DH1 3LE, UK
  • 3DESY, Deutsches Elektronen-Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany
  • 4Bethe Centre for Theoretical Physics and Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany

  • *gudrid.moortgat-pick@desy.de
  • †krzysztof.rolbiecki@durham.ac.uk
  • ‡jamie.tattersall@durham.ac.uk
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Phys. Rev. D 83, 115012 – Published 10 June, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.115012

Abstract

We study the potential to observe CP-violating effects in supersymmetric t˜1-cascade decay chains at the LHC. Asymmetries composed of triple products of momenta of the final-state particles are sensitive to CP-violating effects. Because of large boosts that dilute the asymmetries, these can be difficult to observe. If all particle masses in a cascade decay are known, it may be possible to reconstruct all momenta in the decay chains on an event-by-event basis even when we have missing momentum due to a stable lightest supersymmetric particle. After the reconstruction, the nondiluted CP-violating signal can be recovered and gets significantly enhanced so that an observation may become feasible. A fully hadronic study has been completed to define the areas of the minimal supergravity parameter space that may yield a 3−σ observation with 500  fb−1 at the LHC.

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Phys. Rev. D 83, 115012– Published 10 June, 2011
  • Received 5 October 2010

© 2011 American Physical Society

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