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Photo of Rikkert Frederix

Rikkert Frederix

Senior lecturer

Photo of Rikkert Frederix

Enhancing the tt̄H signal through top-quark spin polarization effects at the LHC

Author

  • S. Biswas
  • R. Frederix
  • E. Gabrielli
  • B. Mele

Summary, in English

We compare the impact of top-quark spin polarization effects in Higgs boson production in association with top-quark pairs and in corresponding backgrounds at the LHC. Because of the spin-zero nature of the Higgs boson, one expects, in the chiral limit for the top quarks, a substantial complementarity in tt̄ spin correlations for a Higgs decaying into fermions/gauge-bosons and tt̄ spin correlations for the corresponding irreducible tt̄ff̄/V V backgrounds. Although top mass effects in tt̄H production are in general dominant, and seriously spoil the chiral-limit expectations, one can find observables that capture the tt̄ angular spin correlations and can help in separating the signal from irreducible backgrounds. In particular, we show that, for both H → bb̄ and H → γγ, taking into account tt̄ spin correlations in tt̄H production and irreducible backgrounds could appreciably improve the LHC sensitivity to the tt̄H channel.

Publishing year

2014-07

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2014

Issue

7

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Heavy quark physics
  • Higgs physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479