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Monojet versus the rest of the world I: t-channel models

Papucci, Michele and Vichi, Alessandro and Zurek, Kathryn M. (2014) Monojet versus the rest of the world I: t-channel models. Journal of High Energy Physics, 2014 (11). Art. No. 24. ISSN 1029-8479.

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Monojet searches using Effective Field Theory (EFT) operators are usually interpreted as a robust and model independent constraint on direct detection (DD) scattering cross-sections. At the same time, a mediator particle must be present to produce the dark matter (DM) at the LHC. This mediator particle may be produced on shell, so that direct searches for the mediating particle can constrain the effective operator being applied to monojet constraints. In this first paper, we do a case study on t-channel models in monojet searches, where the (Standard Model singlet) DM is pair produced via a t-channel mediating particle, whose supersymmetric analogue is the squark. We compare monojet constraints to direct constraints on single or pair production of the mediator from multi-jets plus missing energy searches and we identify the regions where the latter dominate over the former. We show that computing bounds using supersymmetric simplified models and in the narrow width approximation, as done in previous work in the literature, misses important quantitative effects. We perform a full event simulation and statistical analysis, and we compute the effects of both on- and off-shell production of the mediating particle, showing that for both the monojet and multi-jets plus missing energy searches, previously derived bounds provided more conservative bounds than what can be extracted by including all relevant processes in the simulation. Monojets and searches for super-symmetry (SUSY) provide comparable bounds on a wide range of the parameter space, with SUSY searches usually providing stronger bounds, except in the regions where the DM particle and the mediator are very mass degenerate. The EFT approximation rarely is able to reproduce the actual limits. In a second paper to follow, we consider the case of s-channel mediators.

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Additional Information:© The Author(s) 2014. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Received: April 1, 2014. Revised: July 24, 2014. Accepted: August 22, 2014. Published: November 5, 2014. We would like to thank S. Alioli for helpful discussions. This research used resources of the National Energy Research Scientific Computing Center, which is supported, as the work of AV, by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH1123. KZ is supported by NSF CAREER award PHY 1049896. MP would like to thank the CERN TH group for its warm hospitality, and MP and KZ would like to thank the Aspen Center for Physics where part of this work was completed.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-05CH1123
Subject Keywords:Exotics, Hadron-Hadron Scattering, Particle and resonance production
Issue or Number:11
Record Number:CaltechAUTHORS:20190613-164148960
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Official Citation:Papucci, M., Vichi, A. & Zurek, K.M. J. High Energ. Phys. (2014) 2014: 24.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96413
Deposited By: George Porter
Deposited On:17 Jun 2019 20:37
Last Modified:03 Oct 2019 21:22

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