Experimental determination of the isospin of ${\mathrm{\Lambda }}_c/{\mathrm{\Sigma }}_c{\left(2765\right)}^{+}$

We report an experimental determination of the isospin of ${\mathrm{\Lambda }}_c/{\mathrm{\Sigma }}_c{\left(2765\right)}^{+}$ using 980 fb⁻¹ data in the e⁺e⁻ annihilation around $\sqrt{s}=10.6\text{GeV}$ collected by the Belle detector located at the KEKB collider. The isospin partners are searched for in the ${\mathrm{\Sigma }}_c{\left(2455\right)}^{++/0}{\pi }^0$ channels, and no evidence was obtained. Thus the isospin is determined to be zero, and the particle is established to be a Λ_c.