Measurements of cross section of e+e??pp¯?0 at center-of-mass energies between 4.008 and 4.600 GeV

Abstract

Based on e+e? annihilation data samples collected with the BESIII detector at the BEPCII collider at 13 center-of-mass energies from 4.008 to 4.600 GeV, measurements of the Born cross section of e+e??pp¯?0 are performed. No significant resonant structure is observed in the measured energy dependence of the cross section. The upper limit on the Born cross section of e+e??Y(4260)?pp¯?0 at the 90% C.L. is determined to be 0.01 pb. The upper limit on the ratio of the branching fractions [Formula presented] at the 90% C.L. is determined to be 0.02%. © 2017 The Author