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AVERY 1989C

CLEO collaboration; Avery, P. et al.
Observation of the Charmed Strange Baryon Ξ_c(2460)^o
Phys. Rev. Lett. 62 (1989) 863;

Abstracts
We present evidence from the CLEO detector for the charmed strange baryon Ξ_c^o. It is seen in nonresonant e⁺ e^– annihilations at of 10.5 GeV through its decay to Ξ^– π⁺. The measured Ξ_c^o mass is 2471 ± 3 ± 4 MeV/c².

Accelerator CESR Detectors CLEO

Related references
See also
S. F. Biagi et al., Phys. Lett. 122B (1983) 455;
S. F. Biagi et al., Phys. Lett. 150B (1985) 230;
S. F. Biagi et al., Z. Phys. C28 (1985) 175;
P. Cotes et al., Phys. Rev. Lett. 59 (1987) 1530;
Particle Data Group, Review of Particle Properties, G. P. Yost et al., Phys. Lett. 204B (1988) 1;
C. Bebek et al., Phys. Rev. D36 (1987) 690;
S. Behrends et al., Phys. Rev. D31 (1985) 2161;
D. Cassel et al., Nucl. Instr. and Meth. A252 (1986) 325;
W. Kwong, J. L. Rosner, and C. Quigg, Ann. Rev. Nucl. Part. Sci. 37 (1987) 325;
D. Andrews et al., Nucl. Instr. and Meth. 47 (1983) 211;

Experiment comments
The sample consists of 101 pb^-1 of integrated luminosity at energies just below Υ(4S) resonances, 212 pb^-1 at the Υ(4S) and 117 pb^-1 at the Υ(5S).

Reactions

	e+ e– p π+ 2π– X	10.5 GeV (Ecm)	mass
	e+ e– anti-p 2π+ π– X	10.5 GeV (Ecm)	mass
	e+ e– Λ π+ π– X	10.5 GeV (Ecm)	mass
	e+ e– anti-Λ π+ π– X	10.5 GeV (Ecm)	mass
	e+ e– Ξ– π+ X	10.5 GeV (Ecm)	mass
	e+ e– anti-Ξ+ π– X	10.5 GeV (Ecm)	mass
	e+ e– XI/C0! X	10.5 GeV (Ecm)
	e+ e– XI/CBAR0! X	10.5 GeV (Ecm)
	Λ p π–
	Ξ– Λ π–
	anti-Λ anti-p π+
	XI/C0! Ξ– π+
	XI/CBAR0! anti-Ξ+ π–
	anti-Ξ+ anti-Λ π+

Particles studied

	XI/C0	mass
	XI/CBAR0	mass

Record comments
First evidence for the Ξ_c(2460)^o and anti-Ξ_c(2460)^o.

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