Observation of the charmed baryon $Σ_{c}^{+}$ and measurement of the isospin mass splittings of the $Σ_{c}$

Publisher Website

15 November 1993

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 71 (20) , 3259-3262
https://doi.org/10.1103/physrevlett.71.3259

Abstract

We observe the

Σ_{c}^{+}

baryon decaying to

Λ_{c}^{+}

π^{0}

and measure the mass difference M(

Σ_{c}^{+}

)-M(

Λ_{c}^{+}

) to be 168.5±0.2 MeV/

c^{2}

. We also measure the mass differences M(

Σ_{c}^{+ +}

)-M(

Λ_{c}^{+}

) and M(

Σ_{c}^{0}

-M(

Λ_{c}^{+}

) with improved precision and determine the isospin mass splittings M(

Σ_{c}^{+ +}

)-M(

Σ_{c}^{0}

) and M(

Σ_{c}^{+}

)-M(

Σ_{c}^{0}

) to be 1.1±0.4±0.1 MeV/

c^{2}

and 1.4±0.5±0.3 MeV/

c^{2}

, respectively. Our results indicate that the light quark mass difference does not dominate the isospin mass splitting in

Σ_{c}

.

Keywords

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