Dark Matter at Colliders HEP Theory Dark Matter

Dark Matter at Colliders HEP Theory Dark Matter Social event November 22 nd 2019 Eirik Gramstad

Theory: Are Colliders: Me Colliders: Ionut CTA: Eirik SH Theory: Future beam dump: Kyrre

Kyrre Ionut & Me Are Eirik SH Are

Dark Matter at Colliders 1. Production mechanism/theoretical framework 2. Particle detection, identification and results

1) Production mechanism/ theoretical framework

Theoretical Framework Simplified Models Effective Field Theories Model Generality Theoretical Completeness Complete Theories

Theoretical Framework Mediator-based DM models Simplified Models SUSY simplified models [Don’t despair: dedicated seminar Nov. 28 th by Sarah Williams, Cambridge!]

Production: Mediator-based DM models ϕ: mediator χ: dark matter (WIMP) Very few free parameters: mχ, mϕ, Γϕ, g. SM , g. DM, Very rich phenomenology: ar. Xiv: 1507. 00966 Results often shown for spin-0 and spin-1 mediators

2) Particle detection and identification

DM Collider Experiments Focus Mediator-models and SUSY DM Results Public. Results Overview DM Summary Paper Focus Mediator-models and SUSY DM Results Exotics, B 2 G Overview DM Summary Plots Focus B-mesons, dark sector DM Results DMPuzzle 2018, Belle. II Book Focus B-mesons, loops, resonances DM Results Public Page Ionut next talk

The future is bright in the search for the dark (matter)!

Particle Detection • Electrons • Muons • Photons • Jets • B-jets/c-jets • Invisible particles

ETmiss + X (non-resonant) searches High-ETmiss + 1 jet

Resonant searches EXO-19 -012

Dark Photons Resonant ETmiss + X Belle II BELLE 2 -TALK-CONF-2019 -121. pdf PRL 120, 061801 (2018)

Spin-1 mediators Summary. Plots-EXOTICS

Spin-1 mediators Loss of sensitivity for Z’ tt due to increase of Z’ --> χ χ Highest mass reach driven by ETmiss/mjj tails and statistics Change of trigger strategy Loss of sensitivity due to mediator width effects Jet trigger thresholds limiting low-mass reach Annihilation processes described by the simplified model deplete the relic density to below 0. 12

How can we do better? Bandwith = Event Rate x Event Size Limited by: • fast read-out of O(100 M) detector channels • Computing resources (reconstruction) • Disk storage

The Plot Comparing collider with direct detection experiments JHEP 05(2019)142

BACKUP

Long Lived Particles

Workflow common to almost all analyses 1) Define a set of Signal Regions (SR) 2) Define a set of Control Regions (CR) to derive a data driven normalization of simulations with Transfer Factors (TF) 3) Validate the TF in Validation Regions (VR) 4) Unblind SRs and check whether an excess is observed a. If yes; great! b. If no; interpret results in terms of limits on selected models