Grand Unification and Light Color-Octet Scalars at the LHC

Abstract

We study the properties and production mechanisms of color-octet scalars at the LHC. We focus on the single production of both charged and neutral members of an (8,2)_1/2 doublet through bottom quark initial states. These channels provide a window to the underlying Yukawa structure of the scalar sector. Color-octet scalars naturally appear in grand unified theories based on the SU(5) gauge symmetry. In the context of adjoint SU(5) these fields are expected to be light to satisfy constraints coming from unification and proton decay, and may have TeV-scale masses. One combination of their couplings is defined by the relation between the down-quark and charged-lepton Yukawa couplings. Observation of these states at the LHC gives an upper bound on the proton lifetime if they truly arise from this grand unified theory. We demonstrate that TeV-mass scalars can be observed over background at the LHC using boosted top quark final states, and study how well the scalar Yukawa parameters can be measured.

22 pages, LaTeX, 5 figures; typos corrected, references added

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• LHC Phenomenology of an Extended Standard Model with a Real Scalar Singlet
• Top-tagging: A Method for Identifying Boosted Hadronic Tops
• Strategies to Identify Boosted Tops
• NLO QCD corrections to t tbar + jet production at hadron colliders
• The Bulk RS KK-gluon at the LHC
• Flavor Changing Neutral Currents, an Extended Scalar Sector, and the Higgs Production Rate at the LHC
• Single Transverse Spin Asymmetries of Identified Charged Hadrons in Polarized p+p Collisions at $\sqrt{s}$ = 62.4 GeV
• Scalar Particle Contribution to Higgs Production via Gluon Fusion at NLO
• Color-octet scalars at the LHC
• Renormalizable Adjoint SU(5)
• Top Quark Pairs at High Invariant Mass - A Model-Independent Discriminator of New Physics at the LHC
• Color Octet Scalar Production at the LHC
• Using jet mass to discover vector quarks at the LHC
• High p_T Top Quarks at the Large Hadron Collider
• Fermion Masses and the UV Cutoff of the Minimal Realistic SU(5)
• Proton Stability, Dark Matter and Light Color Octet Scalars in Adjoint SU(5) Unification
• Baryogenesis via Leptogenesis in Adjoint SU(5)
• A new signature for color octet pseudoscalars at the LHC

Cited by in corpus (12)

• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
• On the Origin of Neutrino Masses
• Color Sextet Scalars at the CERN Large Hadron Collider
• Non-Global Logarithms in Filtered Jet Algorithms
• Factorization and resummation for single color-octet scalar production at the LHC
• Identifying Multi-Top Events from Gluino Decay at the LHC
• Pair Production of Color-Octet Scalars at the LHC
• Color Octet Scalar Bound States at the LHC
• Flavor unification, dark matter, proton decay and other observable predictions with low-scale $S_4$ symmetry
• Electroweak phase transition in an extension of the Standard Model with scalar color octet
• Fingerprinting the contribution of colored scalars to the $H^{+}{W}^{-}Z(\gamma )$ vertex
• QCD resummation for high-p${}_T$ jet shapes at hadron colliders