Semileptonic decays of spin-entangled baryon-antibaryon pairs

A modular representation for the semileptonic decays of baryons originating from spin polarized and correlated baryon-antibaryon pairs is derived. The complete information decaying baryon propagated to daughter via a real-valued matrix. It allows obtain joint differential distributions in sequential processes involving decay straightforward way. formalism suitable extraction formfactors experiments where strange-baryon-antibaryon are produced electron-positron annihilation or charmonia decays. We give examples such as angular $e^+e^-\to \Lambda\bar\Lambda$ process, $\Lambda\to pe^-\bar{\nu}_e$ $\bar\Lambda\to\bar{p}\pi^+$. can also be used describe charm bottom baryons. Using same principles, modules electromagnetic neutral current weak charged lepton-antilepton pair obtained. As an example, we provide matrix Dalitz transition between two spin-1/2