Search for low-mass resonances decaying into bottom quark-antiquark pairs in proton-proton collisions at $\sqrt{s} =$ 13 TeV

TL;DR

This paper reports a search for low-mass scalar and pseudoscalar resonances decaying into bottom quark-antiquark pairs in proton-proton collisions at 13 TeV, using CMS data, but finds no evidence and sets upper limits on production.

Contribution

First LHC constraints on exotic bottom quark-antiquark resonances below 325 GeV using a novel jet substructure analysis approach.

Findings

No significant excess observed in the mass range 50-350 GeV.

Upper limits set on cross section times branching fraction at 95% CL.

First constraints on such resonances below 325 GeV from the LHC.

Abstract

A search for narrow, low-mass, scalar and pseudoscalar resonances decaying to bottom quark-antiquark pairs is presented. The search is based on events recorded in $\sqrt{s} =$ 13 TeV proton-proton collisions with the CMS detector at the LHC, collected in 2016, and corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The search selects events in which the resonance would be produced with high transverse momentum because of the presence of initial- or final-state radiation. In such events, the decay products of the resonance would be reconstructed as a single large-radius jet with high mass and two-prong substructure. A potential signal would be identified as a narrow excess in the jet invariant mass spectrum. No evidence for such a resonance is observed within the mass range from 50 to 350 GeV, and upper limits at 95% confidence level are set on the product of the cross section and branching fraction to a bottom quark-antiquark pair. These constitute the first constraints from the LHC on exotic bottom quark-antiquark resonances with masses below 325 GeV.