Limits on Electroweak Instanton-Induced Processes with Multiple Boson Production

TL;DR

This paper investigates the potential for observing electroweak instanton-induced processes with multiple bosons at the LHC, comparing different final states and setting upper limits based on CMS data.

Contribution

It provides a comparative analysis of zero- and multi-boson signatures of anomalous $B+L$ violation and derives new upper bounds on multi-boson process cross-sections.

Findings

Upper limit on multi-boson process cross-section established

Comparison of collider signatures for different final states

Recasting of CMS analysis to constrain new physics

Abstract

Recently, the CMS collaboration has reported their search for electroweak instanton-like processes with anomalous $B+L$ violation assuming multi-fermion but zero-boson final states. On the other hand, many theoretical studies suggest that anomalous $B+L$ processes may have an observably large production rate only if their final state contains a large number of electroweak gauge bosons. In this paper, we compare collider signatures of zero- and multi-boson events of anomalous $B+L$ violation at the LHC and derive an upper limit on the cross-section for the multi-boson process by recasting the CMS analysis.