Journal of High Energy Physics

, 2012:27 | Cite as

Supersymmetry with long-lived staus at the LHC

  • R. Barceló
  • J. I. Illana
  • M. Masip
  • A. Prado
  • P. Sánchez-Puertas


We consider SUSY extensions of the standard model where the gravitino is the dark-matter particle and the stau is long lived. If there is a significant mass gap with squarks and gluinos, the staus produced at hadron colliders tend to be fast (β > 0.8), and the searches based on their delay in the time of flight or their anomalous ionization become less effective. Such staus would be identified as regular muons with the same linear momentum and a slightly reduced energy. Compared to the usual SUSY models where a neutralino is the LSP, this scenario implies (i) more leptons (the two staus at the end of the decay chains), (ii) a strong e-μ asymmetry, and (iii) less missing E T (just from neutrinos, as the lightest neutralino decays into stau). We study the bounds on this SUSY from current LHC analyses (same-sign dileptons and multilepton events) and discuss the best strategy for its observation.


Supersymmetry Phenomenology 


  1. [1]
    S. Heinemeyer, O. Stal and G. Weiglein, Interpreting the LHC Higgs search results in the MSSM, Phys. Lett. B 710 (2012) 201 [arXiv:1112.3026] [INSPIRE].ADSGoogle Scholar
  2. [2]
    G. Gamberini, Heavy gluino and squark decays at \( p\overline p \) collider, Z. Phys. C 30 (1986) 605 [INSPIRE].ADSGoogle Scholar
  3. [3]
    R.M. Barnett, J.F. Gunion and H.E. Haber, Discovering supersymmetry with like sign dileptons, Phys. Lett. B 315 (1993) 349 [hep-ph/9306204] [INSPIRE].ADSGoogle Scholar
  4. [4]
    S. Kraml and A. Raklev, Same-sign top quarks as signature of light stops at the LHC, Phys. Rev. D 73 (2006) 075002 [hep-ph/0512284] [INSPIRE].ADSGoogle Scholar
  5. [5]
    J. Fan, M. Reece and J.T. Ruderman, Stealth supersymmetry, JHEP 11 (2011) 012 [arXiv:1105.5135] [INSPIRE].ADSCrossRefGoogle Scholar
  6. [6]
    C. Csáki, L. Randall and J. Terning, Light stops from Seiberg duality, arXiv:1201.1293 [INSPIRE].
  7. [7]
    M. Drees, M. Hanussek and J.S. Kim, Light stop searches at the LHC with monojet events, arXiv:1201.5714 [INSPIRE].
  8. [8]
    G. Giudice and R. Rattazzi, Theories with gauge mediated supersymmetry breaking, Phys. Rept. 322 (1999) 419 [hep-ph/9801271] [INSPIRE].ADSCrossRefGoogle Scholar
  9. [9]
    G. Arcadi, L. Di Luzio and M. Nardecchia, Gravitino dark matter in tree level gauge mediation with and without R-parity, JHEP 12 (2011) 040 [arXiv:1110.2759] [INSPIRE].ADSCrossRefGoogle Scholar
  10. [10]
    W. Buchmüller, L. Covi, K. Hamaguchi, A. Ibarra and T. Yanagida, Gravitino dark matter in R-parity breaking vacua, JHEP 03 (2007) 037 [hep-ph/0702184] [INSPIRE].ADSCrossRefGoogle Scholar
  11. [11]
    J.R. Ellis, K.A. Olive, Y. Santoso and V.C. Spanos, Gravitino dark matter in the CMSSM, Phys. Lett. B 588 (2004) 7 [hep-ph/0312262] [INSPIRE].ADSGoogle Scholar
  12. [12]
    J.R. Ellis, A.R. Raklev and O.K. Oye, Gravitino dark matter scenarios with massive metastable charged sparticles at the LHC, JHEP 10 (2006) 061 [hep-ph/0607261] [INSPIRE].ADSCrossRefGoogle Scholar
  13. [13]
    Particle Data Group collaboration, K. Nakamura et al., Review of particle physics, J. Phys. G 37 (2010) 075021 [INSPIRE].ADSGoogle Scholar
  14. [14]
    D0 collaboration, V. Abazov et al., A search for charged massive long-lived particles, Phys. Rev. Lett. 108 (2012) 121802 [arXiv:1110.3302] [INSPIRE].ADSCrossRefGoogle Scholar
  15. [15]
    ATLAS collaboration, G. Aad et al., Search for heavy long-lived charged particles with the ATLAS detector in pp collisions at \( \sqrt {s} = {7} \) TeV, Phys. Lett. B 703 (2011) 428 [arXiv:1106.4495] [INSPIRE].ADSGoogle Scholar
  16. [16]
    CMS collaboration, S. Chatrchyan et al., Search for heavy long-lived charged particles in pp collisions at \( \sqrt {s} = {7} \) TeV, Phys. Lett. B 713 (2012) 408 [arXiv:1205.0272] [INSPIRE].ADSGoogle Scholar
  17. [17]
    J. Chen and T. Adams, Searching for high speed long-lived charged massive particles at the LHC, Eur. Phys. J. C 67 (2010) 335 [arXiv:0909.3157] [INSPIRE].ADSCrossRefGoogle Scholar
  18. [18]
    J. Heisig and J. Kersten, Long-lived staus from strong production in a simplified model approach, arXiv:1203.1581 [INSPIRE].
  19. [19]
    I. Galon, Y. Shadmi, S. Tarboush and S. Tarem, When a muon is not a muon: detecting fast long-lived charged particles from cascade decays using a mass scan, JHEP 05 (2012) 136 [arXiv:1112.4486] [INSPIRE].ADSCrossRefGoogle Scholar
  20. [20]
    ATLAS collaboration, G. Aad et al., Search for gluinos in events with two same-sign leptons, jets and missing transverse momentum with the ATLAS detector in pp collisions at \( \sqrt {s} = {7} \) TeV, Phys. Rev. Lett. 108 (2012) 241802 [arXiv:1203.5763] [INSPIRE].ADSCrossRefGoogle Scholar
  21. [21]
    CMS collaboration, S. Chatrchyan et al., Search for anomalous production of multilepton events in pp collisions at \( \sqrt {s} = {7} \) TeV, JHEP 06 (2012) 169 [arXiv:1204.5341] [INSPIRE].ADSCrossRefGoogle Scholar
  22. [22]
    J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: going beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [INSPIRE].ADSCrossRefGoogle Scholar
  23. [23]
    W. Beenakker, R. Hopker and M. Spira, PROSPINO: a program for the production of supersymmetric particles in next-to-leading order QCD, hep-ph/9611232 [INSPIRE].
  24. [24]
    T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].ADSCrossRefGoogle Scholar
  25. [25]
    PGS 4: Pretty Good Simulation of high energy collisions webpage,∼conway/research/software/pgs/pgs4-general.htm.
  26. [26]
    CMS collaboration, S. Chatrchyan et al., Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy, Phys. Rev. Lett. 109 (2012) 071803 [arXiv:1205.6615] [INSPIRE].ADSCrossRefGoogle Scholar
  27. [27]
    LHC New Physics Working Group collaboration, D. Alves et al., Simplified models for LHC new physics searches, arXiv:1105.2838 [INSPIRE].
  28. [28]
    M. Hanussek and J. Kim, Testing neutrino masses in the R-parity violating minimal supersymmetric standard model with LHC results, Phys. Rev. D 85 (2012) 115021 [arXiv:1205.0019] [INSPIRE].ADSGoogle Scholar

Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  • R. Barceló
    • 1
  • J. I. Illana
    • 1
  • M. Masip
    • 1
  • A. Prado
    • 1
  • P. Sánchez-Puertas
    • 1
  1. 1.CAFPE and Departamento de Física Teórica y del CosmosUniversidad de GranadaGranadaSpain

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