A search for resonant structures in the J/psi + psi(2S) mass spectrum is performed using proton-proton collision data at root(s) = 13 TeV, corresponding to an integrated luminosity of 140 fb-1, recorded by the ATLAS experiment at the LHC. The decay channels of J/psi + psi(2S) -> 4 mu and J/psi + psi(2S) -> 4 mu + 2 pi are analyzed. An excess near 6.9 GeV is observed in both channels with a combined significance of 8.9 sigma. No significant signal is observed near 7.2 GeV, and an upper limit on its yield relative to X(6900) is provided. A simultaneous fit with the di-J/psi channel is carried out under assumptions regarding the resonance interferences, yielding a ratio of the partial decay widths between the J/psi + psi(2S) and di-J/psi channels of 1.08 +- 0.20 + 0.40 - 0.17 for the resonance near 6.9 GeV.

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. ., et al. (2026). Observation of structures in the J/psi + psi(2S) mass spectrum with the ATLAS detector. PHYSICAL REVIEW D, 113(11) [10.1103/zhkx-k9zl].

Observation of structures in the J/psi + psi(2S) mass spectrum with the ATLAS detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

Abstract

A search for resonant structures in the J/psi + psi(2S) mass spectrum is performed using proton-proton collision data at root(s) = 13 TeV, corresponding to an integrated luminosity of 140 fb-1, recorded by the ATLAS experiment at the LHC. The decay channels of J/psi + psi(2S) -> 4 mu and J/psi + psi(2S) -> 4 mu + 2 pi are analyzed. An excess near 6.9 GeV is observed in both channels with a combined significance of 8.9 sigma. No significant signal is observed near 7.2 GeV, and an upper limit on its yield relative to X(6900) is provided. A simultaneous fit with the di-J/psi channel is carried out under assumptions regarding the resonance interferences, yielding a ratio of the partial decay widths between the J/psi + psi(2S) and di-J/psi channels of 1.08 +- 0.20 + 0.40 - 0.17 for the resonance near 6.9 GeV.
2026
Pubblicato
Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. ., et al. (2026). Observation of structures in the J/psi + psi(2S) mass spectrum with the ATLAS detector. PHYSICAL REVIEW D, 113(11) [10.1103/zhkx-k9zl].
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, N ; Abidi, S ; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Acharya, B ;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/468944
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