engleski

Search for exotic baryon resonances in pp collisions at the CERN SPS

A search for baryon resonance states with exotic quantum numbers was performed in pp collisions at sqrt(s)=17.2 GeV, with the large acceptance NA49 detector. A narrow resonance with mass of 1.862 +/- 0.002 GeV/c2 and width below the detector resolution of ~ 0.018 GeV/c2 is observed. This state is identified as a candidate for the exotic Xi5-- pentaquark baryon with a quark content of (ds ds ubar). At the same mass an indication of a peak is observed in the Xi-pi+, Xibar+pi- and Xibar+pi+ invariant mass spectra. Also, preliminary results of resonance searches in other possible decay chains of the predicted pentaquark states will be presented.

pentaquark; exotic; observation; NA49; CERN

nije evidentirano