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

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
Physical review. D, 卷.113(11), 112015
24/06/2026
Web of Science ID: WOS:001822224700001

摘要

Astronomy & Astrophysics Physical Sciences Physics Physics, Particles & Fields Science & Technology
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(-0.17)(+0.40) for the resonance near 6.9 GeV.

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https://doi.org/10.1103/zhkx-k9zl檢視
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