Observation of structures in the mass range of 2700 to 2900 MeV in the difference between thepptotal cross sections for pure helicity states

Abstract

One decade ago evidence for the formation of diproton resonances was first reported in the mass range of 2140 to 2220 MeV. Recently structures at much higher mass region (2700 to 2900 MeV) were found in various measurements. A new Δ${\sigma }_L$ measurement revealing bumps and a dip is reported here in this mass region and the nature of the structure is discussed.