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 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.1 MoreReceived 28 October 2018DOI:https://doi.org/10.1103/PhysRevD.99.012005Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.© 2019 CERN, for the CMS CollaborationPhysics Subject Headings (PhySH)Research AreasHypothetical particle physics modelsTechniquesHadron collidersParticles & Fields
Highlights
Many models of physics beyond the standard model (SM) require new particles that couple to quarks and gluons and can be observed as dijet resonances
Because of the overwhelming background of events from jets produced through the strong interaction, referred to as quantum chromodynamics (QCD) multijet events, inclusive searches for dijet resonances at the CERN LHC have historically been limited to dijet invariant masses greater than 1 TeV
This paper presents the first LHC search for new particles that decay to bbresonances with masses as low as 50 GeV
Summary
Many models of physics beyond the standard model (SM) require new particles that couple to quarks and gluons and can be observed as dijet resonances. The technique has been employed in searches for low mass resonances decaying to quark-antiquark pairs [12,13,14], which have provided the best sensitivity to date for resonances with masses between 50 and 300 GeV. This technique has been used to search for SM Higgs bosons (H) produced through gluon fusion and decaying to bbpairs [15], with an observed significance of 1.5 standard deviations. We search for resonances produced with high transverse momentum pT because of significant initial- or final-state radiation (ISR or FSR) This ISR or FSR ensures the events pass stringent trigger restrictions set by bandwidth limitations, allowing resonance masses as low as 50 GeV to be probed. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in Ref. [24]
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