Search for Diffuse Supernova Neutrino Background of All Flavors with PandaX-4T

Abstract

We present the first search for the diffuse supernova neutrino background utilizing coherent elastic neutrino-nucleus scattering with the PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory. Based on a total exposure of $1.54~\mathrm{tonne \cdot year}$ from the commissioning and first science runs, we observe no significant event excess over the expected background. We therefore set an upper limit of $(2.27 - 2.43) \times 10^3~\mathrm{cm^{-2}s^{-1}}$ per flavor at 90\% confidence level on the $\nu_x$ flux (each of $\nu_\mu, \bar{\nu}_\mu, \nu_\tau, \bar{\nu}_\tau$) of the diffuse supernova neutrino background for incident neutrino energies above 19.3~MeV. The result is comparable to the current world best limit.