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Dark-matter production through loop-induced processes at the LHC: the s-channel mediator case.

Mattelaer O, Vryonidou E - Eur Phys J C Part Fields (2015)

Bottom Line: We show how studies relevant for mono-X searches at the LHC in simplified models featuring a dark-matter candidate and an s-channel mediator can be performed within the MadGraph5_aMC@NLO framework.We focus on gluon-initiated loop-induced processes, mostly relevant to the case where the mediator couples preferentially to third generation quarks and in particular to the top quark.Our implementation allows us to study signatures at hadron colliders involving missing transverse energy plus jets or plus neutral bosons ([Formula: see text]), possibly including the effects of extra radiation by multi-parton merging and matching to the parton shower.

View Article: PubMed Central - PubMed

Affiliation: Institute for Particle Physics Phenomenology (IPPP), Durham University, Durham, DH1 3LF UK.

ABSTRACT

We show how studies relevant for mono-X searches at the LHC in simplified models featuring a dark-matter candidate and an s-channel mediator can be performed within the MadGraph5_aMC@NLO framework. We focus on gluon-initiated loop-induced processes, mostly relevant to the case where the mediator couples preferentially to third generation quarks and in particular to the top quark. Our implementation allows us to study signatures at hadron colliders involving missing transverse energy plus jets or plus neutral bosons ([Formula: see text]), possibly including the effects of extra radiation by multi-parton merging and matching to the parton shower.

No MeSH data available.


Invariant mass distribution for the DM pair  jets for a pseudoscalar mediator
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Fig8: Invariant mass distribution for the DM pair jets for a pseudoscalar mediator

Mentions: The corresponding results for the pseudoscalar mediator are shown in Figs. 6, 7 and 8. These are almost identical to the results of the scalar propagator, with no visible difference in the normalised distributions for the jet and missing transverse energy. We recall here that a variable that can be used to distinguish between scalar and pseudoscalar is the azimuthal separation between the two leading jets produced in this process, as discussed for the SM Higgs in jets in [38] and for DM searches in [11]. The slightly sharper threshold visible at is due to the different behaviour of the scalar and pseudoscalar amplitudes.Fig. 6


Dark-matter production through loop-induced processes at the LHC: the s-channel mediator case.

Mattelaer O, Vryonidou E - Eur Phys J C Part Fields (2015)

Invariant mass distribution for the DM pair  jets for a pseudoscalar mediator
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4581402&req=5

Fig8: Invariant mass distribution for the DM pair jets for a pseudoscalar mediator
Mentions: The corresponding results for the pseudoscalar mediator are shown in Figs. 6, 7 and 8. These are almost identical to the results of the scalar propagator, with no visible difference in the normalised distributions for the jet and missing transverse energy. We recall here that a variable that can be used to distinguish between scalar and pseudoscalar is the azimuthal separation between the two leading jets produced in this process, as discussed for the SM Higgs in jets in [38] and for DM searches in [11]. The slightly sharper threshold visible at is due to the different behaviour of the scalar and pseudoscalar amplitudes.Fig. 6

Bottom Line: We show how studies relevant for mono-X searches at the LHC in simplified models featuring a dark-matter candidate and an s-channel mediator can be performed within the MadGraph5_aMC@NLO framework.We focus on gluon-initiated loop-induced processes, mostly relevant to the case where the mediator couples preferentially to third generation quarks and in particular to the top quark.Our implementation allows us to study signatures at hadron colliders involving missing transverse energy plus jets or plus neutral bosons ([Formula: see text]), possibly including the effects of extra radiation by multi-parton merging and matching to the parton shower.

View Article: PubMed Central - PubMed

Affiliation: Institute for Particle Physics Phenomenology (IPPP), Durham University, Durham, DH1 3LF UK.

ABSTRACT

We show how studies relevant for mono-X searches at the LHC in simplified models featuring a dark-matter candidate and an s-channel mediator can be performed within the MadGraph5_aMC@NLO framework. We focus on gluon-initiated loop-induced processes, mostly relevant to the case where the mediator couples preferentially to third generation quarks and in particular to the top quark. Our implementation allows us to study signatures at hadron colliders involving missing transverse energy plus jets or plus neutral bosons ([Formula: see text]), possibly including the effects of extra radiation by multi-parton merging and matching to the parton shower.

No MeSH data available.