Exploring the $e^{+}{e}^{-}\to {\mathrm{\Lambda }}_c^{+}{\mathrm{\Lambda }}_c^{-}$ cross sections

A simultaneous fit is performed to the $e^{+}{e}^{-}\to {\mathrm{\Lambda }}_c^{+}{\mathrm{\Lambda }}_c^{-}$ cross section data measured by Belle and BESIII from threshold up to 5.4 GeV. In order to accommodate both the BESIII measurement near threshold and the Belle observation of a resonance $Y(4630)$, we build a composite PDF with a Breit-Wigner resonance and a continuum contribution to model the full cross section line shape of $e^{+}{e}^{-}\to {\mathrm{\Lambda }}_c^{+}{\mathrm{\Lambda }}_c^{-}$. The fit gives a mass of $M=[4636.1_{-7.2}^{+9.8}($stat$)\pm 8.0($syst$)]$~MeV/$c^2$, a width of ${\mathrm{\Gamma }}_{\mathrm{t}\mathrm{o}\mathrm{t}}=[34.5_{-16.2}^{+21.0}($stat$)\pm 5.6($syst$)]$~MeV, and $\Gamma_{e^+ e^-}$\mathcal{B}$[Y(4630)\to\Lambda_c^+\Lambda_c^-]=[18.3_{-6.1}^{+8.8} ($stat$)\pm 1.1($syst$)]$eV\mathrm{/}$c^2$fortheresonance\mathrm{.}Thewidthof$Y(4630)$fromourstudyisnarrowerthanthepreviousBellefit\mathrm{.}Themassandwidthof$Y(4630)$alsoshowgoodagreementwithavectorresonance$Y(4626)$ recently observed in $D_s^{+}{D}_{s1}(2536{)}^{-}$ by Belle.