Optimal Mass Variables for Semivisible Jets

Abstract

Strongly coupled hidden sector theories predict collider production of invisible, composite dark matter candidates mixed with standard model hadrons in the form of semivisible jets. Classical mass reconstruction techniques may not be optimal for these unusual topologies, in which the missing transverse momentum comes from massive particles and has a nontrivial relationship to the visible jet momentum. We apply the artificial event variable network, a semisupervised, interpretable machine learning technique that uses an information bottleneck, to derive superior mass reconstruction functions for several cases of resonant semivisible jet production. We demonstrate that the technique can extrapolate to unknown signal model parameter values. We further demonstrate the viability of conducting an actual search for new physics using this method, by applying the learned functions to standard model background events from quantum chromodynamics.

arXiv commentSubmitted to SciPost Phys Core

References in corpus (21)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• A direct empirical proof of the existence of dark matter
• Parton distributions with LHC data
• Parton distributions from high-precision collider data
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Echoes of a Hidden Valley at Hadron Colliders
• Measuring masses of semi-invisibly decaying particles pair produced at hadron colliders
• Event generator tunes obtained from underlying event and multiparton scattering measurements
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• Emerging Jets
• Semi-visible Jets: Dark Matter Undercover at the LHC
• Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map
• Triggering Soft Bombs at the LHC
• Search for new particles decaying to a jet and an emerging jet
• Search for resonant production of strongly coupled dark matter in proton-proton collisions at 13 TeV
• Accessible Color Sequences for Data Visualization
• Measuring the Higgs boson mass with transverse mass variables