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Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector
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abstract
A search is made for potential $cc\bar{c}\bar{c}$ tetraquarks decaying into a pair of charmonium states in the four muon final state using proton-proton collision data at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 140 fb$^{-1}$ recorded by the ATLAS experiment at LHC. Two decay channels, $J/\psi+J/\psi \rightarrow 4\mu$ and $J/\psi+\psi(2S) \rightarrow 4\mu$, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering 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.
Forward citations
Cited by 11 Pith papers
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Tensor Resonance in $J/\psi J/\psi$ Scattering from Lattice QCD
A lattice QCD computation predicts a 2++ J/psi J/psi resonance with mass 6.54 GeV and width 0.54 GeV, identified with the X(6600) structure.
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Merely mentioning MRI availability in the prompt drives 70-80% of apparent multimodal F1 gains in clinical VLMs, even when no imaging is present.
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Next-to-leading order QCD corrections to electromagnetic production and decay of fully charm tetraquarks
The first NLO QCD corrections to fully charm tetraquark → γγ decay are given, with photon-fusion production cross sections predicted.
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Observation of structures in the $J/\psi +\psi(2S)$ mass spectrum with the ATLAS detector
A structure near 6.9 GeV appears in the J/psi+psi(2S) mass spectrum at 8.9 sigma, consistent with the X(6900) tetraquark.
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$\eta_c\eta_c$ and $J/\psi J/\psi$ scatterings from lattice QCD
Lattice QCD predicts a broad J/psi J/psi 2++ resonance with mass about 6.54 GeV and width about 0.55 GeV, compatible with X(6600) and X(6400), plus a 0++ virtual state near threshold.
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All-charm tetraquarks at hadron colliders: A high-precision fragmentation perspective
TQ4Q2.0 supplies the first complete, uncertainty-quantified set of NRQCD-based fragmentation functions for all-heavy tetraquarks, including nonconstituent channels and public grids for jet-associated production.
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Symmetry Analysis of Compact Tetraquark States and Implications for the Level Ordering of the Fully Charmed Candidates $X(6600)$, $X(6900)$, and $X(7100)$
Symmetry analysis of compact tetraquarks shows low-energy states favor J^P=2+ and places X(6600), X(6900), X(7100) among the lower levels of the fully charmed spectrum.
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$T_{bc\bar s}$ states in the process $\Upsilon \to D^{-} \bar B^{0} D_s^{+}$
The decay Upsilon -> D- anti-B0 Ds+ is predicted to show a peak near 7415-7425 MeV from a spin-2 tetraquark molecule, plus a threshold dip.
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Triply heavy tetraquarks $\bar{b}c\bar{q}c$ and $\bar{c}b\bar{q}b$ in a constituent quark model
A constituent quark model predicts dozens of narrow tetraquark resonances in the mixed beauty-charm systems \bar{b}c\bar{q}c and \bar{c}b\bar{q}b.
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Investigation of full heavy $ QQQQ'\bar{Q}$ pentaquark candidates
QCD sum rules predict a pentaquark with three charm quarks, one bottom quark, and an anti-charm quark near 11.38 GeV, and a pentaquark with three bottom quarks, one charm quark, and an anti-bottom quark near 21.0 GeV,...
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Unquenched Charmonium and Beyond
This Lanzhou-group review argues that coupled-channel (unquenched) effects, not exotic constituents, are the common thread explaining charmonium anomalies from the rho-pi puzzle to the Y-problem states.
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