Mass splitting and production of sigma(c)0 and sigma(c)++ measured in 500-GeV pi- n interactions

Aitala, E. M.

doi:10.1016/0370-2693(96)00471-6

Mass splitting and production of sigma(c)0 and sigma(c)++ measured in 500-GeV pi- n interactions

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Phys.Lett.B

DOI:https://doi.org/10.1016/0370-2693(96)00471-6· OSTI ID:1847825

Aitala, E. M.

>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 $$(167.38\pm 0.29\pm 0.15)\,\mbox{MeV}$$; for $$M(\Sigma_c~{++}) - M(\Lambda_c~+)$$, we find $$(167.76\pm 0.29\pm0.15)\,\mbox{MeV}$$. The rate of $$\Lambda_c~+$$ production from decays of the $$\Sigma_c$$ triplet is $$(22\pm 2\pm 3)\,\mbox{\%}$$ 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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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: E791

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1847825

Report Number(s):: FERMILAB-PUB-96-076-E; arXiv:hep-ex/9604007; oai:inspirehep.net:417432

Journal Information:: Phys.Lett.B, Journal Name: Phys.Lett.B Vol. 379

Country of Publication:: United States

Language:: English

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