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LHC dark matter signals from vector resonances and top partners

LHC dark matter signals from vector resonances and top partners
LHC dark matter signals from vector resonances and top partners

Extensions of the standard model which address the hierarchy problem and dark matter (DM) often contain top partners and additional resonances at the TeV scale. We explore the phenomenology of a simplified effective model with a vector resonance Z′, a fermionic vectorlike colored partner of the top quark T′ as well as a scalar DM candidate φ and provide publicly available implementations in CalcHEP and MadGraph. We study the pp→Z′→T′T′̄→tt̄φφ process at the LHC and find that it plays an important role in addition to the T′T′̄ production via strong interactions. It turns out that the presence of the Z′ can provide a dominant contribution to the tt̄+ET signature without conflicting with existing bounds from Z′ searches in di-jet and di-lepton final states. We find that, through this process, the LHC is already probing DM masses up to about 900 GeV and top partner masses up to about 1.5 TeV, thus exceeding the current bounds from QCD production alone almost by a factor of 2 for both particles.

2470-0010
1-20
Belyaev, Alexander S.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Flacke, Thomas
15314cdc-3890-4986-afe0-d3da8b6c81f3
Jain, Bithika
3709d6bb-053f-4cbf-a5b1-8f6d7d456bf2
Schaefers, Patrick B.
4997241a-a00f-4ea9-a62e-4166afc40699
Belyaev, Alexander S.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Flacke, Thomas
15314cdc-3890-4986-afe0-d3da8b6c81f3
Jain, Bithika
3709d6bb-053f-4cbf-a5b1-8f6d7d456bf2
Schaefers, Patrick B.
4997241a-a00f-4ea9-a62e-4166afc40699

Belyaev, Alexander S., Flacke, Thomas, Jain, Bithika and Schaefers, Patrick B. (2018) LHC dark matter signals from vector resonances and top partners. Physical Review D, 98 (3), 1-20. (doi:10.1103/PhysRevD.98.035019).

Record type: Article

Abstract

Extensions of the standard model which address the hierarchy problem and dark matter (DM) often contain top partners and additional resonances at the TeV scale. We explore the phenomenology of a simplified effective model with a vector resonance Z′, a fermionic vectorlike colored partner of the top quark T′ as well as a scalar DM candidate φ and provide publicly available implementations in CalcHEP and MadGraph. We study the pp→Z′→T′T′̄→tt̄φφ process at the LHC and find that it plays an important role in addition to the T′T′̄ production via strong interactions. It turns out that the presence of the Z′ can provide a dominant contribution to the tt̄+ET signature without conflicting with existing bounds from Z′ searches in di-jet and di-lepton final states. We find that, through this process, the LHC is already probing DM masses up to about 900 GeV and top partner masses up to about 1.5 TeV, thus exceeding the current bounds from QCD production alone almost by a factor of 2 for both particles.

Text
PhysRevD.98.035019
Available under License Creative Commons Attribution.
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e-pub ahead of print date: 15 August 2018
Published date: 15 August 2018

Identifiers

Local EPrints ID: 424178
URI: https://eprints.soton.ac.uk/id/eprint/424178
ISSN: 2470-0010
PURE UUID: faad5af2-9549-45e7-9f21-1ab4de0d83bc
ORCID for Alexander S. Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 05 Oct 2018 11:33
Last modified: 14 Mar 2019 01:40

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Contributors

Author: Alexander S. Belyaev ORCID iD
Author: Thomas Flacke
Author: Bithika Jain
Author: Patrick B. Schaefers

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