Two new excited states, $\Omega_c(3185)^0$ and $\Omega_c(3327)^0$, are observed in the $\Xi_c^{+}K^{-}$ invariant-mass spectrum using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9 {\rm fb}^{-1}$. Five previously observed excited $\Omega_c^0$ states are confirmed, namely $\Omega_c(3000)^0$, $\Omega_c(3050)^0$, $\Omega_c(3065)^0$, $\Omega_c(3090)^0$, and $\Omega_c(3119)^0$. The masses and widths of these seven states are measured with the highest precision to date.
Invariant-mass distribution of the $\Omega_c(X)^{0}$ candidates in (a) data set 1 and (b) data set 2, with the fit results overlaid. A bin width of 5 $\text{ Me V}$ is used for plotting. The previously observed excited $\Omega_c^0$ states are shown in blue dashed lines. The $\Omega_c(3185)^{0}$ state is shown in the brown area, and the $\Omega_c(3327)^{0}$ state is shown in the red area. Three feed-down components are shown as the yellow areas, while the green long-dashed line corresponds to the combinatorial background. |
legend_1.pdf [47 KiB] HiDef png [140 KiB] Thumbnail [142 KiB] *.C file |
|
legend_2.pdf [46 KiB] HiDef png [131 KiB] Thumbnail [138 KiB] *.C file |
||
legend_3.pdf [46 KiB] HiDef png [53 KiB] Thumbnail [50 KiB] *.C file |
||
Fig1a.pdf [55 KiB] HiDef png [304 KiB] Thumbnail [199 KiB] *.C file |
||
Fig1b.pdf [55 KiB] HiDef png [311 KiB] Thumbnail [206 KiB] *.C file |
||
Animated gif made out of all figures. |
PAPER-2022-043.gif Thumbnail |
Fit results of the mass, width, and yield for each state, and for each data set. Uncertainties are statistical only. |
Table_1.pdf [60 KiB] HiDef png [81 KiB] Thumbnail [36 KiB] tex code |
|
Systematic uncertainties on the measured masses and natural widths. |
Table_2.pdf [102 KiB] HiDef png [128 KiB] Thumbnail [48 KiB] tex code |
|
Measured mass and natural width for each of the seven $\Omega_c(X)^{0}$ states. The first uncertainty is statistical and the second is systematic, the third (mass only) arises from the uncertainty of the known $\Xi_{c}^{+}$ mass. |
Table_3.pdf [85 KiB] HiDef png [107 KiB] Thumbnail [54 KiB] tex code |
Created on 23 March 2024.