Mass splitting and production of Σc0 and Σc++ measured in 500 GeV π- -N interactions
Abstract
From a sample of 2722 ± 78 Λc+ decaying to the pK-π+ final state, we have observed, in the hadroproduction experiment E791 at Fermilab, 143 ± 20 Σc0 and 122 ± 18 Σc++ through their decays to Λc+π±. The mass difference M( Σc0) - M( Λc+) is measured to be (167.38 ± 0.29 ± 0.15) MeV; for M( Σc++) - M( Λc+), we find (167.76 ± 0.29 ± 0.15) MeV. The rate of Λc+ production from decays of the Σc triplet is (22 ± 2 ± 3) % of the total Λc+ production assuming equal rate of production from all three, as measured for Σc0 and Σc++. We do not observe a statistically significant Σc baryon-antibaryon production asymmetry. The xF and pt2 spectra of Λc+ from Σc decays are observed to be similar to those for all Λc+'s produced.
- Publication:
-
Physics Letters B
- Pub Date:
- June 1996
- DOI:
- 10.1016/0370-2693(96)00471-6
- arXiv:
- arXiv:hep-ex/9604007
- Bibcode:
- 1996PhLB..379..292A
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- 15 pages, uuencoded postscript 3 figures uuencoded, tar-compressed file