Displaced Higgs production in type III seesaw



We point out that the type III seesaw mechanism introducing fermion triplets predicts peculiar Higgs boson signatures of displaced vertices with two b jets and one or two charged particles which can be cleanly identified. In a supersymmetric theory, the scalar partner of the fermion triplet contains a neutral dark matter candidate which is almost degenerate with its charged components. A Higgs boson can be produced together with such a dark matter triplet in the cascade decay chain of a strongly produced squark or gluino. When the next lightest supersymmetric particle (NLSP) is bino/wino-like, there appears a Higgs boson associated with two charged tracks of a charged lepton and a heavy charged scalar at a displacement larger than about 1 mm. The corresponding production cross-section is about 0.5 fb for the squark/gluino mass of 1 TeV. In the case of the stau NLSP, it decays mainly to a Higgs boson and a heavy charged scalar whose decay length is larger than 0.1 mm for the stau NLSP mixing with the left-handed stau smaller than 0.3. As this process can have a large cascade production ∼2 pb for the squark/gluino mass ∼1 TeV, one may be able to probe it at the early stage of the LHC experiment.


Beyond Standard Model Neutrino Physics 


  1. [1]
    R. Foot, H. Lew, X.G. He and G.C. Joshi, seesaw neutrino masses induced by a triplet of leptons, Z. Phys. C 44 (1989) 441 [SPIRES]. Google Scholar
  2. [2]
    R. Franceschini, T. Hambye and A. Strumia, Type-III see-saw at LHC, Phys. Rev. D 78 (2008) 033002 [arXiv:0805.1613] [SPIRES].ADSGoogle Scholar
  3. [3]
    F. del Aguila and J.A. Aguilar-Saavedra, Distinguishing seesaw models at LHC with multi-lepton signals, Nucl. Phys. B 813 (2009) 22 [arXiv:0808.2468] [SPIRES].CrossRefADSGoogle Scholar
  4. [4]
    A. Arhrib et al., Collider signatures for heavy lepton triplet in type I+III seesaw, Phys. Rev. D 82 (2010) 053004 [arXiv:0904.2390] [SPIRES].ADSGoogle Scholar
  5. [5]
    P. Bandyopadhyay, S. Choubey and M. Mitra, T wo Higgs doublet type III seesaw with μ-τ symmetry at LHC, JHEP 10 (2009) 012 [arXiv:0906.5330] [SPIRES].CrossRefADSGoogle Scholar
  6. [6]
    T. Li and X.-G. He, Neutrino masses and heavy triplet leptons at the LHC: testability of type III seesaw, Phys. Rev. D 80 (2009) 093003 [arXiv:0907.4193] [SPIRES].ADSGoogle Scholar
  7. [7]
    The ATLAS collaboration, G. Aad et al., Expected performance of the ATLAS experiment — Detector, trigger and physics, arXiv:0901.0512 [SPIRES].
  8. [8]
    E.J. Chun, Minimal dark matter in type-III seesaw, JHEP 12 (2009) 055 [arXiv:0909.3408] [SPIRES].CrossRefADSGoogle Scholar
  9. [9]
    M. Cirelli, N. Fornengo and A. Strumia, Minimal dark matter, Nucl. Phys. B 753 (2006) 178 [hep-ph/0512090] [SPIRES].CrossRefADSGoogle Scholar
  10. [10]
    A. Datta, A. Djouadi, M. Guchait and Y. Mambrini, Charged Higgs production from SUSY particle cascade decays at the LHC, Phys. Rev. D 65 (2002) 015007 [hep-ph/0107271] [SPIRES].ADSGoogle Scholar
  11. [11]
    A. Datta, A. Djouadi, M. Guchait and F. Moortgat, Detection of MSSM Higgs bosons from supersymmetric particle cascade decays at the LHC, Nucl. Phys. B 681 (2004) 31 [hep-ph/0303095] [SPIRES].CrossRefADSGoogle Scholar
  12. [12]
    P. Bandyopadhyay, A. Datta and B. Mukhopadhyaya, Signatures of gaugino mass non-universality in cascade Higgs production at the LHC, Phys. Lett. B 670 (2008) 5 [arXiv:0806.2367] [SPIRES].ADSGoogle Scholar
  13. [13]
    P. Bandyopadhyay, Probing non-universal gaugino masses via Higgs boson production under SUSY cascades at the LHC: A detailed study, JHEP 07 (2009) 102 [arXiv:0811.2537] [SPIRES]. CrossRefADSGoogle Scholar

Copyright information

© SISSA, Trieste, Italy 2010

Authors and Affiliations

  1. 1.Korea Institute for Advanced StudySeoulKorea

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