Probing for Ultraheavy Quanta at LHC

Abstract

Experiments at the LHC are sensitive to the presence or absence of matter quanta at mass scales far beyond the scales they can probe directly. The production of $Z$ boson pairs by gluon-gluon fusion is greatly enhanced if there are ultraheavy quanta that carry $SU(3{)}_{\mathrm{Color}}$ and get their mass from electroweak symmetry breaking. For example, a fourth generation quark doublet with an arbitrarily heavy mass would induce a large excess in the $ZZ$ yield that could be detected at the LHC with only $\simeq 10\%$ of the design luminosity.

12 pages plain LATEX plus 2 postscript figures in separate uuencoded file or by request. Complete manuscript available as a postscript file at http://theor1.lbl.gov/www/theorygroup/papers/36949.ps

References in corpus (3)

• Production of $Z$ Boson Pairs at Photon Linear Colliders
• The $W$ Boson Loop Background to H -> ZZ at Photon-photon Colliders
• Testing the Higgs system at a photon-photon collider

Cited by in corpus (12)

• The fourth family: a simple explanation for the observed pattern of anomalies in B-CP asymmetries
• Two-Loop Electroweak Heavy-Fermion Corrections to Higgs-Boson Production and Decay
• Constraints on Mass Spectrum of Fourth Generation Fermions and Higgs Bosons
• Fourth Generation Bound States
• The Lepton Sector of a Fourth Generation
• Search for fourth generation quarks and leptons at the Fermilab Tevatron and CERN Large Hadron Collider
• Extended Friedberg Lee hidden symmetries, quark masses and CP-violation with four generations
• Complementarity of Semileptonic $B$ to $K_2^{\ast }(1430)$ and $K^{\ast }(892)$ Decays in the Standard Model with Fourth Generation
• Neutrino masses from new generations
• Conformal Completion of the Standard Model with a Fourth Generation
• Higgs Mass Constraints on a Fourth Family: Upper and Lower Limits on CKM Mixing
• Bounding CKM Mixing with a Fourth Family