2020/02/29 by A. M. Sirunyan, CMS Collaboration, A. Tumasyan +98 · 1 citation
Physics and Astronomy · #Computer science #Cross section (physics) #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Proton #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Section (typography) #hep-ex
paper · pdf · doi:10.1016/j.physletb.2020.135578
published as Phys. Lett. B 808 (2020) 135578 · Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-18-002 (CMS Public Pages)
openalex publication_date 2020/06/26 · openalex created_date 2020/07/02 · arxiv created 2020/07/17 · arxiv updated 2020/07/20 · openalex updated_date 2026/08/05
The fiducial cross section for Y ( 1 S ) pair production in proton-proton collisions at a center-of-mass energy of 13 TeV in the region where both Y ( 1 S ) mesons have an absolute rapidity below 2.0 is measured to be 79 ± 11 (stat) ± 6 (syst) ± 3 ( B ) pb assuming the mesons are produced unpolarized. The last uncertainty corresponds to the uncertainty in the Y ( 1 S ) meson dimuon branching fraction. The measurement is performed in the final state with four muons using proton-proton collision data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb − 1 . This process serves as a standard model reference in a search for narrow resonances decaying to Y ( 1 S ) μ + μ − in the same final state. Such a resonance could indicate the existence of a tetraquark that is a bound state of two b quarks and two b ¯ antiquarks. The tetraquark search is performed for masses in the vicinity of four times the bottom quark mass, between 17.5 and 19.5 GeV, while a generic search for other resonances is performed for masses between 16.5 and 27 GeV. No significant excess of events compatible with a narrow resonance is observed in the data. Limits on the production cross section times branching fraction to four muons via an intermediate Y ( 1 S ) resonance are set as a function of the resonance mass.