From QCD Instantons at HERA to Electroweak B+L Violation at VLHC

TL;DR

This review explores the analogy between QCD instantons and electroweak B+L violation, suggesting potential observability of rare processes at future colliders like VLHC based on recent experimental and lattice insights.

Contribution

It highlights the analogy between QCD and electroweak instantons and assesses their potential observability at future high-energy colliders, based on recent experimental and lattice data.

Findings

QCD instantons provide insights into electroweak B+L violation.

Cross-sections are unobservably small at current energies.

Possible observability at VLHC with extrapolation beyond conservative limits.

Abstract

This review emphasizes the close analogy between hard QCD instanton-induced chirality violating processes in deep-inelastic scattering and electroweak instanton-induced baryon plus lepton number (B+L) violating processes in Quantum Flavor Dynamics (QFD). Recent information about QCD instantons, both from lattice simulations and from the H1 experiment at HERA, can be used to learn about the fate of electroweak B+L violation at future high energy colliders in the hundreds of TeV regime, such as the projected Very Large Hadron Collider (VLHC). The cross-sections turn out to be unobservably small in a conservative fiducial kinematical region inferred from the above mentioned QCD-QFD analogy. An extrapolation - still compatible with lattice results and HERA - beyond this conservative limit indicates possible observability at VLHC.