Study of J/Psi -> p(p)over-bar phi at BESIII

Abstract

Using a data sample of 1.31×109 J/? events accumulated with the BESIII detector, the decay J/?›pp¯? is studied via two decay modes, ?›KS0KL0 and ?›K+K-. The branching fraction of J/?›pp¯? is measured to be B(J/?›pp¯?)=[5.23±0.06(stat)±0.33(syst)]×10-5, which agrees well with a previously published measurement, but with a significantly improved precision. No evident enhancement near the pp¯ mass threshold, denoted as X(pp¯), is observed, and the upper limit on the branching fraction of J/?›X(pp¯)?›pp¯? is determined to be B(J/?›X(pp¯)?›pp¯?)<2.1×10-7 at the 90% confidence level.