Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector
| Autor: | ATLAS Collaboration |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
p p: scattering
13000 GeV-cms production [resonance] leptonic decay [psi(3685)] width [mass] mass: width psi(3685): leptonic decay scattering [p p] J/psi(3100): pair production charmonium: pair production structure pair production [muon] Charmonium BPHYS hybrid background pair production [J/psi(3100)] final state: (4lepton) (4lepton) [final state] Monte Carlo [numerical calculations] tetraquark ATLAS muon: pair production muon: final state J/psi(3100): leptonic decay CERN LHC Coll pair production [charmonium] final state [muon] leptonic decay [J/psi(3100)] colliding beams [p p] narrow resonance numerical calculations: Monte Carlo p p: colliding beams resonance: production experimental results |
| DOI: | 10.3204/PUBDB-2022-07354 |
| Popis: | 14 pp. (2022). A search for potential $cc\bar{c}\bar{c}$ tetraquarks decaying into a pair of charmonium states in the four muon final state is performed using proton-proton collision data at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS experiment at the Large Hadron Collider (LHC). Two different decay channels, $T_{cc\bar{c}\bar{c}}\to J/\psi~J/\psi\to 4\mu$ and $T_{cc\bar{c}\bar{c}}\to J/\psi~\psi(2S)\to 4\mu$, are studied. Various backgrounds to the resonance searches are estimated based on a hybrid approach involving both Monte Carlo simulations and data-driven methods. Statistically significant excesses are seen in the di-$J/\psi$ channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the $J/\psi$+$\psi$(2S) channel. The fitted masses and decay widths of the structures are reported. |
| Databáze: | OpenAIRE |
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