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Uncovering quasi-degenerate Kaluza-Klein Electro-Weak gauge bosons with top asymmetries at the LHC

Uncovering quasi-degenerate Kaluza-Klein Electro-Weak gauge bosons with top asymmetries at the LHC
Uncovering quasi-degenerate Kaluza-Klein Electro-Weak gauge bosons with top asymmetries at the LHC
By exploiting the correlation between charge and spin polarisation asymmetries in t-tbar, we show that combining the two observables could identify the presence of quasi-degenerate states in a resonant signal at the LHC. As an example, we investigate experimental signatures emerging in top-antitop final states in the context of a model where the Standard Model Electro-Weak sector is allowed to propagate in large extra--dimensions of TeV-1 size while the colour sector is localised. Assuming current experimantal constraints from the 7 and 8 TeV runs and taking into account the estimated top (anti-top) reconstruction efficiencies, we find that the 14 TeV upgraded LHC with the planned integrated luminosity L=100 fb-1 could access these quasi-degenerate multiple resonances and explore for the first time the rich phenomenology in the asymmetry observables. The main outcome would be having measurable quantities, complementary to the usual total and differential cross sections, capable of distinguishing a quasi-degenerate multiply resonant spectrum from a 'standard' single resonance that could present a similar signal in a bump hunt analysis.
beyond standard model, compactification and string models
1-24
Accomando, E.
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Mimasu, K.
4df8b481-263e-4185-89b8-32cbd43b7c26
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Accomando, E.
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Mimasu, K.
4df8b481-263e-4185-89b8-32cbd43b7c26
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614

Accomando, E., Mimasu, K. and Moretti, S. (2013) Uncovering quasi-degenerate Kaluza-Klein Electro-Weak gauge bosons with top asymmetries at the LHC. Journal of High Energy Physics, 154, 1-24. (doi:10.1007/JHEP07(2013)154).

Record type: Article

Abstract

By exploiting the correlation between charge and spin polarisation asymmetries in t-tbar, we show that combining the two observables could identify the presence of quasi-degenerate states in a resonant signal at the LHC. As an example, we investigate experimental signatures emerging in top-antitop final states in the context of a model where the Standard Model Electro-Weak sector is allowed to propagate in large extra--dimensions of TeV-1 size while the colour sector is localised. Assuming current experimantal constraints from the 7 and 8 TeV runs and taking into account the estimated top (anti-top) reconstruction efficiencies, we find that the 14 TeV upgraded LHC with the planned integrated luminosity L=100 fb-1 could access these quasi-degenerate multiple resonances and explore for the first time the rich phenomenology in the asymmetry observables. The main outcome would be having measurable quantities, complementary to the usual total and differential cross sections, capable of distinguishing a quasi-degenerate multiply resonant spectrum from a 'standard' single resonance that could present a similar signal in a bump hunt analysis.

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Published date: 25 July 2013
Additional Information: 26 pages, 8 figures
Keywords: beyond standard model, compactification and string models
Organisations: Physics & Astronomy, Theory Group

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Local EPrints ID: 356659
URI: http://eprints.soton.ac.uk/id/eprint/356659
PURE UUID: 2ade6d56-5a1f-41a8-9ef5-1517d0bf7001

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Date deposited: 23 Sep 2013 12:54
Last modified: 06 Oct 2020 23:26

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