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Near-threshold DD spectroscopy and observation of a new charmonium state Alfonso Albero, Alejandro Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, Pere Graciani Díaz, Ricardo Graugés Pous, Eugeni Vilasis-Cardona, Xavier LHCb Collaboration Marin Benito, Carla Hadrons Quarks Col·lisions (Astrofísica) Hadrons Quarks Collisions (Astrophysics) Using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector between 2011 and 2018, a new narrow charmonium state, the X(3842) resonance, is observed in the decay modes X(3842)→D0D¯¯¯¯0 and X(3842) → D+D−. The mass and the natural width of this state are measured to be mX(3842)=3842.71±0.16±0.12 MeV/c2,ΓX(3842)=2.79±0.51±0.35 MeV, where the first uncertainty is statistical and the second is systematic. The observed mass and narrow natural width suggest the interpretation of the new state as the unobserved (spin-3 ψ3 13D3) charmonium state. In addition, prompt hadroproduction of the ψ(3770) and χ2(3930) states is observed for the first time, and the parameters of these states are measured to be mψ(3770)=3778.1±0.7±0.6 MeV/c2,mχ2(3930)=3921.9±0.6±0.2 MeV/c2,Γχ2(3930)=36.6±1.9±0.9 MeV, where the first uncertainty is statistical and the second is systematic. 2020-07-13T10:09:28Z 2020-07-13T10:09:28Z 2019-07-08 2020-07-13T10:09:29Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1007/JHEP07(2019)035 Journal of High Energy Physics, 2019, p. 35 https://doi.org/10.1007/JHEP07(2019)035 cc-by (c) Alfonso Albero, Alejandro et al., 2019 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)