Next-to-leading order predictions for dark matter production at hadron colliders

Fox, Patrick J.; Williams, Ciaran

doi:10.1103/physrevd.87.054030

Cited by 70 publications

(81 citation statements)

References 51 publications

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“…In order to provide a fully flexible Monte Carlo tool for experimental studies we have implemented the models described above in the MCFM framework [13][14][15]. The results of this paper extend the existing dark matter processes in MCFM [6], which focused primarily on NLO corrections in the effective field theory approach (matching to parton showers was achieved in Ref. [16]).…”

Section: Introductionmentioning

confidence: 95%

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Constraining dark sectors at colliders: Beyond the effective theory approach

et al. 2015

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We outline and investigate a set of benchmark simplified models with the aim of providing a minimal simple framework for an interpretation of the existing and forthcoming searches of dark matter particles at the LHC. The simplified models we consider provide microscopic QFT descriptions of interactions between the Standard Model partons and the dark sector particles mediated by the four basic types of messenger fields: scalar, pseudoscalar, vector and axial-vector. Our benchmark models are characterized by four to five parameters, including the mediator mass and width, the dark matter mass and the effective coupling(s). In the gluon fusion production channel we resolve the top quark in the loop and compute full top-mass effects for scalar and pseudoscalar messengers. We show the LHC limits and reach at 8 and 14 TeV for models with all four messenger types. We also outline the complementarity of direct detection, indirect detection and LHC bounds for dark matter searches. Finally, we investigate the effects which arise from extending the simplified model to include potential new physics contributions in production. Using the scalar mediator as an example, we study the impact of heavy new physics loops which interfere with the top-mediated loops. Our computations are performed within the MCFM framework, and we provide fully flexible public Monte Carlo implementation.

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Section: Introductionmentioning

confidence: 95%

“…Unsurprisingly, contributions due to light degrees of freedom have been found to be significant for limit setting [4,6,8,[40][41][42].…”

Section: Simplified Modelsmentioning

confidence: 99%

Constraining dark sectors at colliders: Beyond the effective theory approach

et al. 2015

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“…Our results can be easily generalized to Majorana fermions [5]), whose interactions with the SM occur via a pseudoscalar mediator a [4,[20][21][22][23][24], namely…”

Section: Simplified Pseudoscalar Portal For Dark Mattermentioning

confidence: 99%

Simplified models for dark matter face their consistent completions

2017

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Reprinted with permission from the American Physical Society: Physical Review D 95, 055027 c (2017) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Simplified dark matter models have been recently advocated as a powerful tool to exploit the complementarity between dark matter direct detection, indirect detection and LHC experimental probes. Focusing on pseudoscalar mediators between the dark and visible sectors, we show that the simplified dark matter model phenomenology departs significantly from that of consistent SUð2Þ L × Uð1Þ Y gauge invariant completions. We discuss the key physics that simplified models fail to capture, and its impact on LHC searches. Notably, we show that resonant mono-Z searches provide competitive sensitivities to standard mono-jet analyses at 13 TeV LHC.

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“…The strongest limits are placed by collider searches for monojets and missing momentum [21,[45][46][47][48][49][50]. This signature is generated by the production of a and radiation of a gluon, such as in the Feynman diagrams in Fig.…”

Section: Iii1 S-channel Mediatormentioning

confidence: 99%

“…The EFT treatment then becomes inaccurate and does not capture the suppression of production rates. See [46] and [49] for studies on the differences between an EFT approach and treating the mediator as an active degree of freedom.…”

Section: Iii1 S-channel Mediatormentioning

confidence: 99%

Forbidden dark matter at the weak scale via the top portal

2017

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At the tail of its velocity distribution, cold dark matter (DM) can annihilate at finite temperature to states heavier than itself. We explore the possibility that DM freezeout is dictated by these "forbidden annihilations" at the electroweak scale. Demanding that annihilation products be Standard Model particles, we find that for the forbidden mechanism to primarily set the DM relic abundance, DM must couple predominantly, if not solely, to top quarks. This can be arranged by invoking a non-trivial flavor structure such as Minimal Flavor Violation. We avail two avenues to achieve the correct thermal cross-section, requiring a mediator exchanged in the s-or t-channel. These simplified models submit easily to direct detection and collider searches, and necessarily hide from indirect detection signals. Viable supersymmetric spectra involving the forbidden mechanism may be found if combined with co-annihilation.

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Next-to-leading order predictions for dark matter production at hadron colliders

Cited by 70 publications

References 51 publications

Constraining dark sectors at colliders: Beyond the effective theory approach

Constraining dark sectors at colliders: Beyond the effective theory approach

Simplified models for dark matter face their consistent completions

Forbidden dark matter at the weak scale via the top portal

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