Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-01-07
Phys.Rev.D68:015003,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
15p, add. comments to clarify model, +2 ref., version to appear PRD
Scientific paper
10.1103/PhysRevD.68.015003
We consider the possibility of studying novel particles at the TeV scale with enhanced couplings to the top quark via top quark pair production at the LHC and VLHC. In particular we discuss the case of neutral scalar and vector resonances associated with a strongly interacting electroweak symmetry breaking sector. We constrain the couplings of these resonances by imposing appropriate partial wave unitarity conditions and known low energy constraints. We evaluate the new physics signals via WW -> tt~ for various models without making approximation for the initial state W bosons, and optimize the acceptance cuts for the signal observation. We conclude that QCD backgrounds overwhelm the signals in both the LHC and a 200 TeV VLHC, making it impossible to study this type of physics in the tt~ channel at those machines.
Han Tao
Rainwater David
Valencia German
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