Abstract (data abstract)

Three structures, X (6600), X (6900), and X (7100), have emerged from the J/ψ J/ψ (J/ψ → μ+μ−) mass spectrum. These are candidates of all-charm tetraquarks, an exotic form of hadronic matter. A clearer picture of these states is obtained using proton-proton collision data collected by the CMS detector that corresponds to 315 fb−1, which yields 3.6 times more J/ψ J/ψ pairs than previous studies by CMS. All three structures, and their mutual interference, have statistical significances above five standard deviations. The presence of interference implies that the structures have common quantum numbers. Their squared masses align linearly with a resonance index and have natural widths that systematically decrease as the index increases. These features are consistent with radial excitations of tetraquarks composed of two aligned spin-1 diquarks without orbital excitation, and disfavor other interpretations. The J/ψ ψ(2S) → μ+μ−μ+μ− decay mode is also explored and the X (6900) and X (7100) states are found with significances exceeding 8 and 4 standard deviations, respectively.

Table 1 - middle row

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10.17182/hepdata.167853.v1/t1

Measured masses and widths of the three X states from the fits to the $\mathrm{J}/\psi\mathrm{J}/\psi$ mass spectrum from the Run...
Table 1 - last row

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10.17182/hepdata.167853.v1/t2

Measured masses and widths of the three X states from the fits to the $\mathrm{J}/\psi \psi(2S)$ mass spectrum from the...
Figure 3

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10.17182/hepdata.167853.v1/t3

The $\mathrm{J}/\psi\mathrm{J}/\psi$ invariant-mass spectrum covering the full range of the fit: 6.175 - 15.0 GeV.
Figure 4

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10.17182/hepdata.167853.v1/t4

$\mathrm{J}/\psi\psi(2S)$ invariant-mass spectrum covering the full range of the fit: 6.76 - 15.0 GeV.
Figure 5

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10.17182/hepdata.167853.v1/t5

Squared masses (GeV^2) versus radial quantum number of (from left to right): the Upsilon family (triangles); the X(6600), X(6900), X(7100)...
Figure 5 (Regge fit)

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10.17182/hepdata.167853.v1/t6

Masses and widths obtained from the Regge trajectory fit for the X states shown in Fig. 5 (statistical uncertainties only)....
Figure 6

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10.17182/hepdata.167853.v1/t7

Widths (in MeV) as a function of the radial quantum number. Shown are, from left to right: the total widths...
Figure S4 top left

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10.17182/hepdata.167853.v1/t8

Comparison of the measured X Regge trajectory with theoretical predictions from spin-0 diquark model for 0++ states with L =...
Figure S4 top right

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10.17182/hepdata.167853.v1/t9

Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 0++ states with L =...
Figure S4 bottom

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10.17182/hepdata.167853.v1/t10

Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 2++ states with L =...
Figure S5 top left

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10.17182/hepdata.167853.v1/t11

Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 0-+ states with L =...
Figure S5 top right

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10.17182/hepdata.167853.v1/t12

Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 1-+ states with L =...
Figure S5 bottom

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10.17182/hepdata.167853.v1/t13

Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 2-+ states with L =...
Figure S6

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10.17182/hepdata.167853.v1/t14

Comparison of the measured X Regge trajectory with theoretical predictions from spin-0, 1 diquark model for (0, 1, 2)++ states...

Table 1 - middle row

Table 1 - last row

Figure 3

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Figure 5

Figure 5 (Regge fit)

Figure 6

Figure S4 top left

Figure S4 top right

Figure S4 bottom

Figure S5 top left

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Figure S6

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