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Non-Standard Interactions (NSI) between neutrinos and matter affect theneutrino flavor oscillations. Due to the high matter density in the core of theSun, solar neutrinos are suited to probe these interactions. Using the $277$kton-yr exposure of Super-Kamiokande to $^{8}$B solar neutrinos, we search forthe presence of NSI. Our data favors the presence of NSI with down quarks at1.8$\sigma$, and with up quarks at 1.6$\sigma$, with the best fit NSIparameters being ($\epsilon_{11}^{d},\epsilon_{12}^{d}$) = (-3.3, -3.1) for$d$-quarks and ($\epsilon_{11}^{u},\epsilon_{12}^{u}$) = (-2.5, -3.1) for$u$-quarks. After combining with data from the Sudbury Neutrino Observatory andBorexino, the significance increases by 0.1$\sigma$.

Testing Non-Standard Interactions Between Solar Neutrinos and Quarks with Super-Kamiokande