A Study of the Decay Properties of the Charmed Baryon [Lamda] C+.
Author: Catriona Elizabeth Kaye Charlesworth
Publisher:
Published: 1992
Total Pages: 102
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Author: Catriona Elizabeth Kaye Charlesworth
Publisher:
Published: 1992
Total Pages: 102
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DOWNLOAD EBOOKAuthor: C.E.K. Charlesworth
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Published: 1992
Total Pages: 0
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DOWNLOAD EBOOKThe charmed baryon $\Lambda\sbsp{c}{+}$ has been observed using the ARGUS detector in the DORIS II $e\sp{+}e\sp-$ storage ring at DESY. The ARGUS experiment is a 4$\pi$ magnetic solenoidal detector used to observe $e\sp{+}e\sp-$ annihilations at center-of-mass energies around 10.4 GeV. We have studied 5 decays modes of the $\Lambda\sbsp{c}{+}$. The decay mode $\Lambda\sbsp{c}{+}\to pK\sp-\pi\sp+$ was used to measure the $\Lambda\sbsp{c}{+}$ fragmentation properties. A value of 0.24 $\pm$ 0.04 was found for the Peterson et al. parameter $\epsilon$, and the $\sigma(\Lambda\sbsp{c}{+}$) $\cdot\ BR(\Lambda\sbsp{c}{+}\to pK\sp-\pi\sp+$) was measured to be 12.0 $\pm$ 1.1 $\pm$ 1.3) pb. The decay modes $\Lambda\sbsp{c}{+}\to\Lambda\pi\sp+$ and $\Lambda\sbsp{c}{+}\to\Sigma\sp0\pi\sp+$ were also studied. In the former the asymmetry parameter $\alpha\sb{\Lambda\sb{c}}$ was measured to be $-$1.0 $\pm$ 0.5, indicating that parity is maximally violated in this decay. The two production cross section times branching ratios were measured to be (2.2 $\pm$ 0.3 $\pm$ 0.3) pb and (2.0 $\pm$ 0.7 $\pm$ 0.3) pb respectively. Finally, a search was made for evidence of W-exchange in the decay $\Lambda\sbsp{c}{+}\to\Xi\sp-K\sp+\pi\sp+$. This final state can arise through a simple spectator decay or via the more exotic W-exchange decay into $\Xi\sp{*0}K\sp+$, where the $\Xi\sp{*0}$ subsequently decays into $\Xi\sp-\pi\sp+$. The two body rate was measured to be (35 $\pm$ 17)% of the three body rate, indicating that a significant portion of the $\Xi\sp-K\sp+\pi\sp+$ final state may occur via W-exchange.
Author: Eric James Mannel
Publisher:
Published: 1991
Total Pages: 210
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DOWNLOAD EBOOKAuthor: Richard George Van de Water
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Published: 1993
Total Pages: 286
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Published: 2001
Total Pages:
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DOWNLOAD EBOOKResults are presented for the 500 GeV/c pion production asymmetry and polarization of the [Lambda]{sub c} ({bar [Lambda]}{sub c}) charmed baryon from Fermilab experiment E791. An analysis of the decay to the p{bar K}[pi] final state is described. Resonant sub-channel fractions and phases are given and possible resonant effects in the low mass p{bar K} system discussed. Significant decay to {Lambda}{sub c} → [Delta]2K− establishes for the first time the importance of a W exchange mechanism in charmed baryon decay.
Author: Jiu Zheng
Publisher:
Published: 1999
Total Pages: 262
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Published: 1990
Total Pages: 786
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Published: 1990
Total Pages: 840
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Published: 2005
Total Pages: 14
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DOWNLOAD EBOOKUsing data from the FOCUS experiment (FNAL-E831), they study the decay of ?{sub c}+ baryons into final states contain a ? hyperon. The branching fractions of ?{sub c}+ into ??+, ??+?+?− and ?{bar K}°K+ relative to that into pK− ?+ are measured to be 0.217 ± 0.013 ± 0.020, 0.508 ± 0.024 ± 0.024 and 0.142 ± 0.018 ± 0.022, respectively. New measurements are also reported. Further, an analysis of the subresonant structure for the ?{sub c}+ → ??+?+?− decay mode is presented.
Author: Brian Aa Petersen
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Published: 2006
Total Pages: 8
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DOWNLOAD EBOOKThe authors report on several studies of charm baryon production and decays by the BABAR collaboration. They confirm previous observations of the {Xi}'{sub c}{sup 0/+}, {Xi}{sub c}(2980){sup +} and {Xi}{sub c}(3077){sup +} baryons, measure branching ratios for Cabibbo-suppressed {Lambda}{sub c}{sup +} decays and use baryon decays to study the properties of the light-quark baryons, {Omega}{sup -} and {Xi}(1690){sup 0}.