6533b7d7fe1ef96bd1268479
RESEARCH PRODUCT
Measuring the top energy asymmetry at the LHC: QCD and SMEFT interpretations
Peter BertaEleni VryonidouAlexander BasanLucia MasettiSusanne Westhoffsubject
Nuclear and High Energy PhysicsParticle physicsPhysics beyond the Standard Modelmedia_common.quotation_subjectFOS: Physical sciences01 natural sciences7. Clean energyAsymmetryStandard ModelHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)Hadron-Hadron scattering (experiments)0103 physical sciencesEffective field theorylcsh:Nuclear and particle physics. Atomic energy. Radioactivity010306 general physicsParton showermedia_commonParticle Physics - PhenomenologyPhysicsQuantum chromodynamicsLarge Hadron Collider010308 nuclear & particles physicshep-exHigh Energy Physics::Phenomenologyhep-phQCDHadronizationHigh Energy Physics - PhenomenologyTop physicsBeyond Standard Modellcsh:QC770-798High Energy Physics::ExperimentParticle Physics - Experimentdescription
The energy asymmetry in top-antitop-jet production is an observable of the top charge asymmetry designed for the LHC. We perform a realistic analysis in the boosted kinematic regime, including effects of the parton shower, hadronization and expected experimental uncertainties. Our predictions at particle level show that the energy asymmetry in the Standard Model can be measured with a significance of $3\sigma$ during Run 3, and with more than $5\sigma$ significance at the HL-LHC. Beyond the Standard Model the energy asymmetry is a sensitive probe of new physics with couplings to top quarks. In the framework of the Standard Model Effective Field Theory, we show that the sensitivity of the energy asymmetry to effective four-quark interactions is higher or comparable to other top observables and resolves blind directions in current LHC fits. We suggest to include the energy asymmetry as an important observable in global searches for new physics in the top sector.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-01-20 |