Mass Splitting and Production of $Σ_c^0$ and $Σ_c^{++}$ Measured in $500 {GeV}$ $π^- -$N Interactions

Details Mass Splitting and Production of $Σ_c^0$ and $Σ_c^{++}$ Measured in $500 {GeV}$ $π^- -$N Interactions Mass Splitting and Production of $Σ_c^0$ and $Σ_c^{++}$ Measured in $500 {GeV}$ $π^- -$N Interactions

1996-04-24

arxiv.org/abs/hep-ex/9604007v1

Phys.Lett.B379:292-298,1996

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, uuencoded postscript 3 figures uuencoded, tar-compressed file

Scientific paper

10.1016/0370-2693(96)00471-6

From a sample of $2722 \pm 78$ $\Lambda_c^+$ decaying to the $pK^-\pi^+$ final state, we have observed, in the hadroproduction experiment E791 at Fermilab, $143 \pm 20$ $\Sigma_c^0$ and $122 \pm 18$ $\Sigma_c^{++}$ through their decays to $\Lambda_c^+ \pi^{\pm}$. The mass difference $M(\Sigma_c^0) - M(\Lambda_c^+$) is measured to be $(167.38\pm 0.29\pm 0.15) {MeV}$; for $M(\Sigma_c^{++}) - M(\Lambda_c^+)$, we find $(167.76\pm 0.29\pm0.15) {MeV}$. The rate of $\Lambda_c^+$ production from decays of the $\Sigma_c$ triplet is $(22\pm 2\pm 3) {%}$ of the total $\Lambda_c^+$ production assuming equal rate of production from all three, as measured for $\Sigma_c^0$ and $\Sigma_c^{++}$. We do not observe a statistically significant $\Sigma_c$ baryon-antibaryon production asymmetry. The $x_F$ and $p_t^2$ spectra of $\Lambda_c^+$ from $\Sigma_c$ decays are observed to be similar to those for all $\Lambda_c^+$'s produced.

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