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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  for the three mass benchmarks. The only mediator giving non-zero results is the vector one
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Fig22: Missing transverse momentum distribution for for the three mass benchmarks. The only mediator giving non-zero results is the vector one

Mentions: For the mono-photon case the only mediator which contributes is the vector one. The contributions of a scalar, pseudoscalar and axial-vector vanish due to charge conjugation invariance. The cross sections at 13 TeV for the three benchmarks are shown in Table 7, while the corresponding distributions for the missing transverse energy are shown in Fig. 22. Only the resonant scenario gives a non-negligible cross section for unit couplings, implying that the mono-photon process in this simplified DM model can be accessible experimentally only for limited corners of the mass parameter space.


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  for the three mass benchmarks. The only mediator giving non-zero results is the vector one
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig22: Missing transverse momentum distribution for for the three mass benchmarks. The only mediator giving non-zero results is the vector one
Mentions: For the mono-photon case the only mediator which contributes is the vector one. The contributions of a scalar, pseudoscalar and axial-vector vanish due to charge conjugation invariance. The cross sections at 13 TeV for the three benchmarks are shown in Table 7, while the corresponding distributions for the missing transverse energy are shown in Fig. 22. Only the resonant scenario gives a non-negligible cross section for unit couplings, implying that the mono-photon process in this simplified DM model can be accessible experimentally only for limited corners of the mass parameter space.

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.