Enhancing the tt̄H signal through top-quark spin polarization effects at the LHC
Biswas, S. ; Frederix, R. LU
; Gabrielli, E.
and Mele, B.
(2014)
In Journal of High Energy Physics
2014(7).
- Abstract
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... (More)
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.
(Less)
- author
- Biswas, S.
; Frederix, R.
LU
; Gabrielli, E.
and Mele, B.
- publishing date
- 2014-07
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Heavy quark physics, Higgs physics
- in
- Journal of High Energy Physics
- volume
- 2014
- issue
- 7
- article number
- 20
- publisher
- Springer
- external identifiers
-
- scopus:84924098856
- ISSN
- 1029-8479
- DOI
- 10.1007/JHEP07(2014)020
- language
- English
- LU publication?
- no
- id
- f4b8f807-72d3-4aee-baf8-8891f21a6d79
- date added to LUP
- 2019-05-28 15:35:48
- date last changed
- 2022-01-31 21:04:37
@article{f4b8f807-72d3-4aee-baf8-8891f21a6d79,
abstract = {{<p>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.</p>}},
author = {{Biswas, S. and Frederix, R. and Gabrielli, E. and Mele, B.}},
issn = {{1029-8479}},
keywords = {{Heavy quark physics; Higgs physics}},
language = {{eng}},
number = {{7}},
publisher = {{Springer}},
series = {{Journal of High Energy Physics}},
title = {{Enhancing the tt̄H signal through top-quark spin polarization effects at the LHC}},
url = {{http://dx.doi.org/10.1007/JHEP07(2014)020}},
doi = {{10.1007/JHEP07(2014)020}},
volume = {{2014}},
year = {{2014}},
}