Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP01(2016)071
Keywords
Beyond Standard Model; Heavy Quark Physics
Categories
Funding
- NSF [PHY-1316222]
- NSERC [PGSD3-438393-2013]
- DOE [DE-SC0003883, DE-SC-000999]
- MIUR-FIRB [RBFR12H1MW]
- ERC Advanced Grant [267985]
- Galileo Galilei Institute for Theoretical Physics
- Munich Institute for Astro- and Particle Physics of the DFG cluster of excellence Origin and Structure of the Universe
- U.S. Department of Energy (DOE) [DE-SC0003883] Funding Source: U.S. Department of Energy (DOE)
- Division Of Physics
- Direct For Mathematical & Physical Scien [1316222] Funding Source: National Science Foundation
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Deviations of the top electroweak couplings from their Standard Model values imply that certain amplitudes for the scattering of third generation fermions and longitudinally polarized vector bosons or Higgses diverge quadratically with momenta. This high-energy growth is a genuine signal of models where the top quark is strongly coupled to the sector responsible for electroweak symmetry breaking. We propose to profit from the high energies accessible at the LHC to enhance the sensitivity to non-standard top-Z couplings, which are currently very weakly constrained. To demonstrate the effectiveness of the approach, we perform a detailed analysis of tW -> tW scattering, which can be probed at the LHC via pp -> t (t) over barW j. By recasting a CMS analysis at 8 TeV, we derive the strongest direct bounds to date on the Ztt couplings. We also design a dedicated search at 13 TeV that exploits the distinctive features of the t (t) over barW j signal. Finally, we present other scattering processes in the same class that could provide further tests of the top-Higgs sector.
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