Precise ${}^{136}$Xe Double Beta Decay Measurement in PandaX-4T with Implications on the Nuclear Matrix Elements and Majorons

PandaX Collaboration, Zhe Yuan, Zihao Bo +111

The continuous spectrum of double beta decay (${\hat{I}}^2{\hat{I}}^2$) provides a sensitive probe to test the predictions of the standard model and to search for signatures of new physics beyond it…