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Dark Matter characterization at the LHC in the Effective Field Theory approach

Dark Matter characterization at the LHC in the Effective Field Theory approach
Dark Matter characterization at the LHC in the Effective Field Theory approach
We have studied the complete set of dimension 5 and dimension 6 effective operators involving the interaction of scalar, fermion and vector Dark Matter (DM) with SM quarks and gluons, to explore the possibility to distinguish these operators and characterise the spin of DM at the LHC. We have found that three factors — the effective dimension of the operator, the structure of the SM part of the operator and the parton densities of the SM particles connected to the operator — uniquely define the shape of the (unobservable) invariant mass distribution of the DM pair and, consequently, the shape of the (observable) E missT distribution related to it. Using χ2 analysis, we found that at the LHC, with a luminosity of 300 fb−1, certain classes of EFT operators can be distinguished from each other. Hence, since DM spin is partly correlated with the factors defining the shape of E missT , the LHC can potentially shed a light also on DM spin. We have also observed a drastic difference in the efficiencies (up to two orders of magnitude) for large E missT cuts scenarios with different DM spin, thus indicating that the DM discovery potential strongly depends on it. The study we perform here can be applied more generally than within the EFT paradigm, where the DM mediator is not produced on-the-mass-shell, such as the case of t-channel mediator or mediator with mass below 2M DM, where the invariant mass of the DM pair is not fixed.
1029-8479
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Panizzi, Luca
e8ade38e-ee5d-4e2d-8307-3286a8b92740
Pukhov, Alexander
1ebba234-752f-4148-9b9e-400d14d875f5
Thomas, Marc
536332b5-5780-441c-b9d8-4316d1ce0b1d
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Panizzi, Luca
e8ade38e-ee5d-4e2d-8307-3286a8b92740
Pukhov, Alexander
1ebba234-752f-4148-9b9e-400d14d875f5
Thomas, Marc
536332b5-5780-441c-b9d8-4316d1ce0b1d

Belyaev, Alexander, Panizzi, Luca, Pukhov, Alexander and Thomas, Marc (2017) Dark Matter characterization at the LHC in the Effective Field Theory approach. Journal of High Energy Physics, 2017, [110]. (doi:10.1007/JHEP04(2017)110).

Record type: Article

Abstract

We have studied the complete set of dimension 5 and dimension 6 effective operators involving the interaction of scalar, fermion and vector Dark Matter (DM) with SM quarks and gluons, to explore the possibility to distinguish these operators and characterise the spin of DM at the LHC. We have found that three factors — the effective dimension of the operator, the structure of the SM part of the operator and the parton densities of the SM particles connected to the operator — uniquely define the shape of the (unobservable) invariant mass distribution of the DM pair and, consequently, the shape of the (observable) E missT distribution related to it. Using χ2 analysis, we found that at the LHC, with a luminosity of 300 fb−1, certain classes of EFT operators can be distinguished from each other. Hence, since DM spin is partly correlated with the factors defining the shape of E missT , the LHC can potentially shed a light also on DM spin. We have also observed a drastic difference in the efficiencies (up to two orders of magnitude) for large E missT cuts scenarios with different DM spin, thus indicating that the DM discovery potential strongly depends on it. The study we perform here can be applied more generally than within the EFT paradigm, where the DM mediator is not produced on-the-mass-shell, such as the case of t-channel mediator or mediator with mass below 2M DM, where the invariant mass of the DM pair is not fixed.

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More information

Accepted/In Press date: 30 March 2017
e-pub ahead of print date: 19 April 2017
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 408530
URI: http://eprints.soton.ac.uk/id/eprint/408530
ISSN: 1029-8479
PURE UUID: df969f89-f504-4e8b-b933-8e5895203e31
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 23 May 2017 04:01
Last modified: 22 Nov 2021 02:55

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Contributors

Author: Luca Panizzi
Author: Alexander Pukhov
Author: Marc Thomas

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