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  • Near-threshold D D ¯ \[ \mathrm{D}\overline{\mathrm{D}} \] spectroscopy and observation of a new charmonium state
    P Alvarez Cartelle; Amato, S; Artamonov, A; Audurier, B; Balagura, V; Batozskaya, V; Battig, A; Bay, A; Belous, K; Bertolin, A; Bhasin, S; Blusk, S; Boettcher, T; Bozzi, C; Cadeddu, S; Chatzikonstantinidis, G; Chekalina, V; Ciezarek, G; Comerma-Montells, A; Couturier, B; M Cruz Torres; Dalseno, J; De Capua, S; Dean, C T; Demmer, M; Dey, B; Dziewiecki, M; Eisenhardt, S; Filippov, S; Fini, R A; Gorelov, I V; Greim, R; Hadavizadeh, T; Haefeli, G; Hicheur, A; R Hidalgo Charman; Ibis, P; Inglessi, A; Jashal, B K; Ketel, T; Khanji, B; Koliiev, S; Kvaratskheliya, T; Longstaff, I; Lusiani, A; Mackowiak, P; Malygina, H; Marangotto, D; D Martinez Santos; Materok, M; McNulty, R; Meinert, N; Mitzel, D S; Moise, R D; Morello, G; Morris, A B; Müller, J; Nandi, A; Nieswand, S; Osborn, J D; Pellegrino, A; Penso, G; Pietrzyk, B; Polci, F; Ponce, S; Pugatch, V; Pullen, H; Qian, W; Rangel, M S; Ratnikov, F; Roehrken, M; Roth, J D; J Ruiz Vidal; Saitta, B; Schindler, H; Schmidt, B; Serra, N; Skiba, I; Soares, M; Stagni, F; Stefkova, S; Steinkamp, O; Stemmle, S; Straumann, U; Tilley, M J; Tisserand, V; Usachov, A; Vagnoni, V; E van Herwijnen; C Vázquez Sierra; Veronesi, M; Viana Barbosa, J V; Vilasis-Cardona, X; Vorobyev, A; Walsh, J; Wang, M; Websdale, D; Q Xu; Zhang, W C; Zhelezov, A

    The journal of high energy physics, 07/2019, Letnik: 2019, Številka: 7
    Journal Article

    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 X3842→D0D¯0\ \mathrm{X}(3842)\to {D}^0{\overline{D}}^0 \ and X(3842) → D+D−. The mass and the natural width of this state are measured to bemX3842=3842.71±0.16±0.12MeV/c2,ΓX3842=2.79±0.51±0.35MeV,\ \begin{array}{l}{m}_{X(3842)}=3842.71\pm 0.16\pm 0.12\ MeV/{c}^2,\hfill \\ {}{\varGamma}_{X(3842)}=2.79\pm 0.51\pm 0.35\ MeV,\hfill \end{array} \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 bemψ3770=3778.1±0.7±0.6MeV/c2,mχ23930=3921.9±0.6±0.2MeV/c2,Γχ23930=36.6±1.9±0.9MeV,\ \begin{array}{l}{m}_{\psi (3770)}=3778.1\pm 0.7\pm 0.6\ MeV/{c}^2,\hfill \\ {}{m}_{\chi_2(3930)}=3921.9\pm 0.6\pm 0.2\ MeV/{c}^2,\hfill \\ {}{\varGamma}_{\chi_2(3930)}=36.6 \pm 1.9 \pm 0.9\ MeV,\hfill \end{array} \where the first uncertainty is statistical and the second is systematic.

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