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There is a well known 2$\sigma$ tension in the measurements of the solar$\Delta m^2$ between KamLAND and SNO/Super-KamioKANDE. Precise determination ofthe solar $\Delta m^2$ is especially important in connection with current andfuture long baseline CP violation measurements. Reference \cite{Seo:2018rrb}points out that currently running short baseline reactor neutrino experiments,Daya Bay and RENO, can also constrain solar $\Delta m^2$ value as demonstratedby a GLoBES simulation with a limited systematic uncertainty consideration. Inthis work, the publicly available data, from Daya Bay (1,958 days) and RENO(2,200 days) are used to constrain the solar $\Delta m^2$. Verification of ourmethod through $\Delta m^2_{ee}$ and $\sin^2 \theta_{13}$ measurements isdiscussed in Appendix A. Using this verified method, reasonable constraints onthe solar $\Delta m^2$ are obtained using above Daya Bay and RENO data, bothindividually and combined. We find that the combined data of Daya Bay and RENOset an upper limit on the solar $\Delta m^2$ of 18 $\times 10^{-5}$ eV$^2$ atthe 95% C.L., including both systematic and statistical uncertainties. Thisconstraint is slightly more than twice the KamLAND value. As this combinedresult is still statistics limited, even though driven by Daya Bay data, theconstraint will improve with the additional running of this experiment.

Constraint on the solar $\Delta m^2$ using 4,000 days of short baseline reactor neutrino data