Limits on electroweak instanton-induced processes with multiple boson production

Abstract

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 review the state-of-the-art of the predictions of electroweak instanton-induced processes and compare collider signatures of zero- and multi-boson events of anomalous B + L violation at the LHC. An upper limit on the cross-section for the multi-boson process is derived by recasting the CMS analysis.