A search is reported for near-threshold structures in the $J/\psi J/\psi$ invariant mass spectrum produced in proton-proton collisions at $\sqrt{s} = 13 \, \text{TeV}$ from data collected by the CMS experiment, corresponding to an integrated luminosity of $135 \, \text{fb}^{-1}$. Three structures are found, and a model with quantum interference among these structures provides a good description of the data. A new structure is observed with a local significance above 5 standard deviations at a mass of $6638^{+43}_{-38} \, (\text{stat}) \,^{+16}_{-31} \, (\text{syst}) \, \text{MeV}$. Another structure with even higher significance is found at a mass of $6847^{+44}_{-28} \, (\text{stat}) \,^{+48}_{-20} \, (\text{syst}) \, \text{MeV}$, which is consistent with the $X(6900)$ resonance reported by the LHCb experiment and confirmed by the ATLAS experiment. Evidence for another new structure, with a local significance of 4.7 standard deviations, is found at a mass of $7134^{+48}_{-25} \, (\text{stat}) \,^{+41}_{-15} \, (\text{syst}) \, \text{MeV}$. Results are also reported for a model without interference, which does not fit the data as well and shows mass shifts up to 150 MeV relative to the model with interference.

New structures in the J=ψJ=ψ mass spectrum in proton-proton collisions at √s = 13 TeV / Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J. W., Bergauer, T., Chatterjee, S., Damanakis, K., Dragicevic, M., Escalante Del Valle, A., Hussain, P. S., Jeitler, M., Krammer, N., Liko, D., Mikulec, I., Schieck, J., Schöfbeck, R., Schwarz, D., Sonawane, M., Templ, S., Waltenberger, W., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 132:11(2024), pp. 1-20. [10.1103/physrevlett.132.111901]

New structures in the J=ψJ=ψ mass spectrum in proton-proton collisions at √s = 13 TeV

Cunqueiro Mendez, L.;Del Re, D.;Mijuskovic, J.;Organtini, G.;Paramatti, R.;Quaranta, C.;Rahatlou, S.;Santanastasio, F.;
2024

Abstract

A search is reported for near-threshold structures in the $J/\psi J/\psi$ invariant mass spectrum produced in proton-proton collisions at $\sqrt{s} = 13 \, \text{TeV}$ from data collected by the CMS experiment, corresponding to an integrated luminosity of $135 \, \text{fb}^{-1}$. Three structures are found, and a model with quantum interference among these structures provides a good description of the data. A new structure is observed with a local significance above 5 standard deviations at a mass of $6638^{+43}_{-38} \, (\text{stat}) \,^{+16}_{-31} \, (\text{syst}) \, \text{MeV}$. Another structure with even higher significance is found at a mass of $6847^{+44}_{-28} \, (\text{stat}) \,^{+48}_{-20} \, (\text{syst}) \, \text{MeV}$, which is consistent with the $X(6900)$ resonance reported by the LHCb experiment and confirmed by the ATLAS experiment. Evidence for another new structure, with a local significance of 4.7 standard deviations, is found at a mass of $7134^{+48}_{-25} \, (\text{stat}) \,^{+41}_{-15} \, (\text{syst}) \, \text{MeV}$. Results are also reported for a model without interference, which does not fit the data as well and shows mass shifts up to 150 MeV relative to the model with interference.
2024
CMS; lhc; Jpsi; proton
01 Pubblicazione su rivista::01a Articolo in rivista
New structures in the J=ψJ=ψ mass spectrum in proton-proton collisions at √s = 13 TeV / Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J. W., Bergauer, T., Chatterjee, S., Damanakis, K., Dragicevic, M., Escalante Del Valle, A., Hussain, P. S., Jeitler, M., Krammer, N., Liko, D., Mikulec, I., Schieck, J., Schöfbeck, R., Schwarz, D., Sonawane, M., Templ, S., Waltenberger, W., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 132:11(2024), pp. 1-20. [10.1103/physrevlett.132.111901]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1719773
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