Search for a dimuon resonance in the $\Upsilon$ mass region

TL;DR

This paper reports a search for a new spin-0 boson decaying into muon pairs in the mass range near the $5$ to 15 GeV, using LHCb data, setting upper limits on its production, with no evidence of discovery.

Contribution

First search for a dimuon resonance near the $5$ to 15 GeV region at LHCb, establishing upper limits close to the $5$ resonances.

Findings

No significant signal observed.

Upper limits on production cross-section set.

Limits are comparable to existing best results.

Abstract

A search is performed for a spin-0 boson, $\phi$, produced in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, using prompt $\phi\rightarrow\mu^+\mu^-$ decays and a data sample corresponding to an integrated luminosity of approximately 3.0 ${\rm fb}^{-1}$ collected with the LHCb detector. No evidence is found for a signal in the mass range from 5.5 to 15 GeV. Upper limits are placed on the product of the production cross-section and the branching fraction into the dimuon final state. The limits are comparable to the best existing over most of the mass region considered and are the first to be set near the $\Upsilon$ resonances.