Mass splitting and production of Σc0 and Σc++ measured in 500 GeV π− -N interactions

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

Physics Letters B

Volume 379, Issues 1–4, 27 June 1996, Pages 292-298

https://doi.org/10.1016/0370-2693(96)00471-6 Get rights and content

Abstract

From a sample of 2722 ± 78 Λ_c⁺ decaying to the pK⁻π⁺ final state, we have observed, in the hadroproduction experiment E791 at Fermilab, 143 ± 20 Σ_c⁰ and 122 ± 18 Σ_c⁺⁺ through their decays to Λ_c⁺π^±. The mass difference M(Σ_c⁰) − M(Λ_c⁺) is measured to be (167.38 ± 0.29 ± 0.15) MeV; for M(Σ_c⁺⁺) − M(Λ_c⁺), we find (167.76 ± 0.29 ± 0.15) MeV. The rate of Λ_c⁺ production from decays of the Σ_c triplet is (22 ± 2 ± 3) % of the total Λ_c⁺ production assuming equal rate of production from all three, as measured for Σ_c⁰ and Σ_c⁺⁺. We do not observe a statistically significant Σ_c baryon-antibaryon production asymmetry. The x_F and p_t² spectra of Λ_c⁺ from Σ_c decays are observed to be similar to those for all Λ_c⁺'s produced.

References (26)

C.S. Kalman et al.
Nuovo Cimento Lett.
(1977)
J. Crawford
Phys. Rev. Lett.
(1994)
S. Amato
Nucl. Instr. and Meth. A
(1993)
Review of Particle Properties
Phys. Rev. D
(1994)
M. Adamovich
Phys. Lett. B
(1993)
G.A. Alves
Phys. Rev. Lett.
(1994)
S. Capstick et al.
Phys. Rev. D
(1986)
S. Capstick
Phys. Rev. D
(1987)
A. De Rújula et al.
Phys. Rev. D
(1975)
K. Lane et al.
Phys. Rev. Lett.
(1976)
L.H. Chan
Phys. Rev. D
(1977)
L.H. Chan
Phys. Rev. D
(1985)

W.Y.P. Hwang et al.

Phys. Rev. D

(1987)

S. Sinha

Phys. Lett. B

(1989)

C. Itoh

Prog. Theor. Phys.

(1975)

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Physics Letters B

Abstract

References (26)

Nuovo Cimento Lett.

Phys. Rev. Lett.

Nucl. Instr. and Meth. A

Review of Particle Properties

Phys. Rev. D

Phys. Lett. B

Phys. Rev. Lett.

Phys. Rev. D

Phys. Rev. D

Phys. Rev. D

Phys. Rev. Lett.

Phys. Rev. D

Phys. Rev. D

Phys. Rev. D

Phys. Lett. B

Prog. Theor. Phys.

Cited by (11)

Λ<inf>c</inf>Σ<inf>c</inf>π coupling and Σ<inf>c</inf> → Λ<inf>c</inf>π decay in lattice QCD

CP violation and mixing results from FNAL E791

Heavy Baryons and electromagnetic decays

Asymmetries in the production of Λ(c)/<sup>+</sup> and Λ(c)/<sup>-</sup> baryons in 500 GeV/c π<sup>-</sup> nucleon interactions

Rare radiative charm decays within the standard model and beyond

Rare radiative charm decays within the standard model and beyond