Near-threshold DD¯ spectroscopy and observation of a new charmonium state
| Parent link: | Journal of High Energy Physics Vol. 2019, iss. 7.— 2019.— [35, 22 p.] |
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| Corporate Authors: | , |
| Other Authors: | , , , , , , |
| Summary: | Title screen 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¯¯¯¯0X(3842)→D0D¯0 and X(3842) → D+D−. The mass and the natural width of this state are measured to bemX(3842)=3842.71±0.16±0.12 MeV/c2,ΓX(3842)=2.79±0.51±0.35 MeV,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,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. |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2019)035 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663405 |