Measurement of masses of the $Ξ_c(2645)$ and $Ξ_c(2815)$ baryons and observation of $Ξ_c(2980)\toΞ_c(2645)π$ %and observation of the $Ξ_c(2980)$ and observation of $Ξ_c(2980)\to Ξ_c(2645)π$

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dc.creatorBelle Collaboration
dc.creatorLesiak, T.
dc.date2008-02-27
dc.date.accessioned2026-07-07T11:56:19Z
dc.date.available2026-07-07T11:56:19Z
dc.descriptionWe report a precise measurement of the masses of the $Ξ_c(2645)$ and $Ξ_c(2815)$ baryons using a data sample of 414 fb$^{-1}$ collected by the Belle collaboration at the KEKB $e^+ e^-$ collider. The states $Ξ_c(2645)^{0,+}$ are observed in the $Ξ_c^{+,0}π^{-,+}$ decay modes, while the $Ξ_c(2815)^{0,+}$ are reconstructed in the $Ξ_c(2645)^{+,0}π^{-,+}$ decay modes. The following mass splittings are determined: $m_{Ξ_c(2645)^+} - m_{Ξ_c(2645)^0} = (-0.1 \pm 0.3 ({\rm stat}) \pm 0.6 {(\rm syst})) {\rm MeV}/{\rm c}^2$ and $m_{Ξ_c(2815)^+} - m_{Ξ_c(2815)^0} = (-3.4 \pm 1.9 ({\rm stat}) \pm 0.9 {(\rm syst})) {\rm MeV}/{\rm c}^2$ with a much better precision than the current world averages. We also observe a new decay mode, $Ξ_c(2980)^{0,+} \to Ξ_c(2645)^{+,0}π^{-,+}$.
dc.description13 pages, 4 figures, submitted to Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/0802.3968
dc.identifierhttp://arxiv.org/abs/0802.3968
dc.identifierPhys.Lett.B665:9-15,2008
dc.identifierdoi:10.1016/j.physletb.2008.05.055
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205546
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of masses of the $Ξ_c(2645)$ and $Ξ_c(2815)$ baryons and observation of $Ξ_c(2980)\toΞ_c(2645)π$ %and observation of the $Ξ_c(2980)$ and observation of $Ξ_c(2980)\to Ξ_c(2645)π$
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