# Search for low mass vector resonances decaying to quark-antiquark pairs in proton-proton collisions at sqrt(s) = 13 TeV

## TL;DR

This paper reports a search for low mass vector resonances decaying into quark-antiquark pairs in proton-proton collisions at 13 TeV, using the CMS detector, setting new limits in previously unexplored mass regions.

## Contribution

It introduces a novel search method for low mass vector resonances at the LHC, focusing on merged jet signatures at high transverse momentum.

## Key findings

- No evidence of vector resonances in the 100-300 GeV range.
- Sets upper limits on production cross sections in new mass-coupling regions.
- Explores the previously untested below 140 GeV mass region.

## Abstract

A search is reported for a narrow vector resonance decaying to quark-antiquark pairs in proton-proton collisions at sqrt(s) = 13 TeV, collected with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.7 inverse femtobarns. The vector resonance is produced at large transverse momenta, with its decay products merged into a single jet. The resulting signature is a peak over background in the distribution of the invariant mass of the jet. The results are interpreted in the framework of a leptophobic vector resonance and no evidence is found for such particles in the mass range of 100-300 GeV. Upper limits at 95% confidence level on the production cross section are presented in a region of mass-coupling phase space previously unexplored at the LHC. The region below 140 GeV has not been explored by any previous experiments.