Using proton-proton collision data, corresponding to an integrated luminosity of 9 fb, 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 3 ψ3(1_3D3) 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.

Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Near-threshold DDbar spectroscopy and observation of a new charmonium state. JOURNAL OF HIGH ENERGY PHYSICS, 2019(7) [10.1007/JHEP07(2019)035].

Near-threshold DDbar spectroscopy and observation of a new charmonium state

Belloli N.;Borsato M.;Calvi M.;Carniti P.;Fazzini D.;Gotti C.;Martinelli M.;
2019

Abstract

Using proton-proton collision data, corresponding to an integrated luminosity of 9 fb, 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 3 ψ3(1_3D3) 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.
Articolo in rivista - Articolo scientifico
Charm physics; Hadron-Hadron scattering (experiments); Heavy quark production; Quarkonium
English
2019
2019
7
35
open
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Near-threshold DDbar spectroscopy and observation of a new charmonium state. JOURNAL OF HIGH ENERGY PHYSICS, 2019(7) [10.1007/JHEP07(2019)035].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/247134
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