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CALICCHIO 1980

BEBC TST neutrino collaboration; Calicchio, M. et al.
First Observation of the Production and Decay of the Σ_c(2455)⁺
Phys. Lett. 93B (1980) 521;

Abstracts
An event with the decay chain Σ_c(2455)⁺ → Λ_c⁺ π^o, Λ_c⁺ → K^– p π⁺, has been observed in an exposure of BEBC, equipped with a track sensitive target, to the wide band neutrino beam from the SPS at CERN. The event has a unique three constraint kinematic fit to the ΔS = -ΔQ reaction ν p → μ^– p K^– 2π⁺ π^o with both gammas from the π^o decay detected. The proton and other final state particles are identified. The masses are M(Λ_c⁺) = 2290 ± 3 MeV/c², M(SIGMA/C+ ) = 2457 ± 4 MeV/c² and M(SIGMA/C+ )-M(Λ_c⁺) = 168 ± 3 MeV/c². Including other data one obtains M(SIGMA/C++ )-M(SIGMA/C+ ) = 0 ± 4 MeV/c².

Accelerator CERN-SPS Detectors HBC-BEBC-TST-HYB

Related references
See also
E. G. Cazzoli et al., Phys. Rev. Lett. 34 (1975) 1125;
B. Knapp et al., Phys. Rev. Lett. 37 (1976) 882;
A. M. Cnops et al., Phys. Rev. Lett. 42 (1979) 197;
W. Lockman et al., Phys. Lett. 85B (1979) 443;
V. Flaminio et al., Compilation of cross-sections, preprint CERN-HERA 79-01, 79-02 (1979);
G. S. Abrams et al., Phys. Rev. Lett. 44 (1980) 10;
C. Baltay et al., Phys. Rev. Lett. 42 (1979) 1721;
K. L. Giboni et al., Phys. Lett. 85B (1979) 437;
R. Beuselinck et al., Nucl. Instr. and Meth. 154 (1978) 445;
D. Drijard et al., Phys. Lett. 85B (1979) 452;

Reactions

	νμ p p K– 2π+ πo μ–	30-300 GeV (Plab)	mass
	Λc+ p K– π+
	Σc(2455)+ p K– π+ πo

Particles studied

	Σc(2455)+	ex, mass
	Λc+	mass

Record comments
First evidence for the Σ_c(2455)⁺.

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