Collider signatures of mirror fermions in the framework of a left-right mirror model

May 12, 2013
16 pages
Published in:
  • Phys.Rev.D 88 (2013) 9, 095005
  • Published: Nov 11, 2013
e-Print:

Citations per year

20142017202020232024012345
Abstract: (APS)
The idea of left-right symmetry with mirror fermions is very appealing from the symmetry point of view. In this picture, unlike the Standard Model, the symmetry is not only left-right symmetric, but each left-handed fermion multiplet is accompanied by a new right-handed fermion multiplet of opposite chirality. In this work, we consider a gauge symmetry, SU(3)c⊗SU(2)L⊗SU(2)R⊗U(1)Y′, supplemented by a discrete Z2 symmetry. Instead of having right-handed multiplets for each left-handed multiplet of the same fermions as in the usual left-right model, the mirror model includes right- handed doublets involving new fermions (called mirrors), and similarly for each right- handed singlet, there are corresponding mirror singlets. Thus the gauge anomaly is naturally absent in this model, and the model also provides a solution for the strong CP problem because of parity conservation. The first stage of symmetry breaking is achieved by a doublet mirror Higgs with a vacuum expectation value ≃107  GeV, needed to explain the neutrino mass ≃10-11  GeV. The mirror fermions can mix with the ordinary fermions via a scalar that is singlet under the gauge symmetry. In this model, only light mirror particles, having masses in the few hundred GeV range, are e^, u^, d^ with well-defined spectrum. u^ and d^ can be pair produced at the LHC and can be detected as (uZ) and (dZ) resonances. We discuss the signals of these mirror fermions at the LHC and find that the reach at the LHC can be as large as mq^≃800  GeV.
Note:
  • 26 pages, 11 figures
  • 12.60.-i
  • 12.15.Ff
  • 14.65.Jk
  • mirror: model
  • fermion: right-handed
  • fermion: left-handed
  • fermion: mixing
  • fermion: mirror particle
  • multiplet: chiral
  • symmetry: left-right
Loading ...