Near-threshold DD¯ spectroscopy and observation of a new charmonium stateстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 ноября 2020 г.
Аннотация:Using proton-proton collision data, corresponding to an integrated luminosity of 9fb−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±0.12MeV/c2,ΓX(3842)=2.79±0.51±0.35MeV,
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\nobreakdash-3 ψ3(13D3) charmonium state. In addition, prompt hadroproduction of the ψ(3770) and χc2(3930) states is observed for the first time, and the parameters of these states are measured to be
mψ(3770)=3778.1±0.7±0.6MeV/c2,mχc2(3930)=3921.9±0.6±0.2MeV/c2,Γχc2(3930)=36.6±1.9±0.9MeV,
where the first uncertainty is statistical and the second is systematic.