# Updated search for long-lived particles decaying to jet pairs

## TL;DR

This paper reports a search for long-lived particles decaying into jet pairs within specific mass and lifetime ranges, using LHCb data, and sets new limits on their production cross-section.

## Contribution

It introduces a novel search strategy for long-lived particles decaying to jet pairs in LHCb data, with new constraints on their production cross-section.

## Key findings

- No excess above background observed.
- Limits set on production cross-section as a function of mass and lifetime.
- Search covers particles with masses 25-50 GeV/c^2 and lifetimes 2-500 ps.

## Abstract

A search is presented for long-lived particles with a mass between 25 and 50 GeV/$c^2$ and a lifetime between 2 and 500 ps, using proton-proton collision data corresponding to an integrated luminosity of 2.0 fb$^{-1}$, collected by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The particles are assumed to be pair-produced in the decay of a 125 GeV/$c^2$ Standard-Model-like Higgs boson. The experimental signature is a single long-lived particle, identified by a displaced vertex with two associated jets. No excess above background is observed and limits are set on the production cross-section as a function of the mass and lifetime of the long-lived particle.