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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.


Missing transverse momentum distribution for  jets for an axial-vector mediator
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Fig14: Missing transverse momentum distribution for jets for an axial-vector mediator

Mentions: The differential distributions are shown in Figs. 13, 14 and 15. The relative shapes for the three scenarios follow the same patterns as the other three couplings for the transverse momentum distributions, i.e. the resonant one falls more rapidly. A difference compared to the vector mediator is seen in the DM invariant mass distribution for the heavy-mediator scenario. Due to the presence of the bottom quarks in the loops, a significant fraction of the cross section lies at low invariant masses. The fact that the width of the axial-vector mediator is significantly larger, further enhances the off-shell contribution. In fact, both the transverse momentum and the missing energy distributions are softer than the corresponding ones for the vector mediator. Nevertheless, these distributions remain harder than those of the Z background, facilitating boosted technique-based searches.Fig. 14


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)

Missing transverse momentum distribution for  jets for an axial-vector mediator
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig14: Missing transverse momentum distribution for jets for an axial-vector mediator
Mentions: The differential distributions are shown in Figs. 13, 14 and 15. The relative shapes for the three scenarios follow the same patterns as the other three couplings for the transverse momentum distributions, i.e. the resonant one falls more rapidly. A difference compared to the vector mediator is seen in the DM invariant mass distribution for the heavy-mediator scenario. Due to the presence of the bottom quarks in the loops, a significant fraction of the cross section lies at low invariant masses. The fact that the width of the axial-vector mediator is significantly larger, further enhances the off-shell contribution. In fact, both the transverse momentum and the missing energy distributions are softer than the corresponding ones for the vector mediator. Nevertheless, these distributions remain harder than those of the Z background, facilitating boosted technique-based searches.Fig. 14

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.