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Observation of the Narrow State $X(3872)\to J/\psi\pi^{+}\pi^{-}$ in $\bar{p}p$ Collisions at $\sqrt{s}=1.96 \TeV$
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abstract
We report the observation of a narrow state decaying into $J/\psi\pi^+\pi^-$ and produced in $220 pb^{-1}$ of $\bar{p} p $ collisions at $\sqrt{s}=1.96 TeV$ in the CDF II experiment. We observe $ 730 \pm 90 $ decays. The mass is measured to be $3871.3 \pm 0.7 (stat) \pm 0.4 (syst) MeV/c2$, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.
Forward citations
Cited by 10 Pith papers
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Bottomoniumlike states in proton collisions: Fragmentation and resummation
New TQHL1.1 and TQ4Q1.1 fragmentation functions for doubly and fully bottomed tetraquarks are constructed and evolved, yielding first predictions for bottom-tetraquark plus jet distributions at 14 and 100 TeV.
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Heavy baryon production with an instanton interaction
A model calculation shows that an instanton-inspired three-quark interaction can excite both the lambda and rho internal modes of heavy baryons, giving production-rate ratios that reflect baryon spin structure.
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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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Hidden-Charm Tetraquarks in a Mixture Model: Coupled-Channel Analysis with $c\bar{c}$ and Hadronic Molecular Components
A coupled-channel mixture model fitted to the X(3872) and Z(3930) masses predicts the X(3860) at about 3867 MeV, dominated by the charmonium core.
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Effect of a repulsive three-body interaction on the $DD^{(*)}K$ molecule
Repulsive three-body interactions gradually expand DD(∗)K molecules and eventually dissociate them into a D(∗)K bound pair plus a distant D meson.
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Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
X(3872) is best described as a shallow D D* molecule in which one-pion exchange and a small charmonium core provide comparable attraction.
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Probing the structure of $\chi_{c1}(3872)$: Heavy quark symmetries at work
Heavy-quark large-mass limit applied to E1 transitions of χ_c1(2P) yields decay rates that match LHCb measurements for χ_c1(3872) under the 2P assignment.
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The charming case of $X(3872)$ and $\chi_{c1}(2P)$
The radiative decay ratio R(X(3872)) = B(X(3872) to psi(2S) gamma)/B(X(3872) to J/psi gamma) is predicted to be 1.7 ± 0.3, matching the LHCb value 1.67, supporting the chi_c1(2P) charmonium assignment.
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Hadronic molecules
Hadronic molecules serve as a framework for certain exotic heavy-quark states where nonrelativistic effective field theories enable predictions with controlled uncertainty.
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Production of exotic hadrons in $pp$ and nuclear collisions
A review of exotic-hadron production in pp, pbar-p, and nuclear collisions, arguing that such measurements can discriminate between hadronic-molecule and compact-tetraquark interpretations of states like the X(3872).
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