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EnglishWe 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 tt¯ spin correlations for a Higgs decaying into fermions/gauge-bosons and tt¯ spin correlations for the corresponding irreducible tt¯ff¯/VV backgrounds. Although top mass effects in tt¯H production are in general dominant, and seriously spoil the chiral-limit expectations, one can find observables that capture the tt¯ angular spin correlations and can help in separating the signal from irreducible backgrounds. In particular, we show that, for both H→bb¯ and H→γγ, taking into account tt¯ spin correlations in tt¯H production and irreducible backgrounds could appreciably improve the LHC sensitivity to the tt¯H channel.
| Titolo: | Enhancing the ttH signal through top-quark spin polarization effects at the LHC | |
| Autori: | ||
| Data di pubblicazione: | 2014 | |
| Rivista: | ||
| 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 tt¯ spin correlations for a Higgs decaying into fermions/gauge-bosons and tt¯ spin correlations for the corresponding irreducible tt¯ff¯/VV backgrounds. Although top mass effects in tt¯H production are in general dominant, and seriously spoil the chiral-limit expectations, one can find observables that capture the tt¯ angular spin correlations and can help in separating the signal from irreducible backgrounds. In particular, we show that, for both H→bb¯ and H→γγ, taking into account tt¯ spin correlations in tt¯H production and irreducible backgrounds could appreciably improve the LHC sensitivity to the tt¯H channel. | |
| Handle: | http://hdl.handle.net/11368/2829814 | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/JHEP07(2014)020 | |
| URL: | http://dx.doi.org/10.1007/JHEP07(2014)020 | |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
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