Multi-track Displaced Vertices at B-Factories

TL;DR

This paper proposes inclusive multi-track displaced vertex searches at B-factories to detect long-lived particles from hidden sectors, offering high sensitivity to models not constrained by existing searches.

Contribution

It introduces a new search strategy for long-lived particles at B-factories, classifies decay modes within an effective field theory, and evaluates sensitivity across various production modes and detection criteria.

Findings

Inclusive searches can detect a wide range of hidden sector models.

Sensitivity is high for multiple displaced vertices per event.

The approach can probe models beyond current experimental constraints.

Abstract

We propose a program at B-factories of inclusive, multi-track displaced vertex searches, which are expected to be low background and give excellent sensitivity to non-minimal hidden sectors. Multi-particle hidden sectors often include long-lived particles (LLPs) which result from approximate symmetries, and we classify the possible decays of GeV-scale LLPs in an effective field theory framework. Considering several LLP production modes, including dark photons and dark Higgs bosons, we study the sensitivity of LLP searches with different number of displaced vertices per event and track requirements per displaced vertex, showing that inclusive searches can have sensitivity to a large range of hidden sector models that are otherwise unconstrained by current or planned searches.