We report evidence for the hc state of charmonium in its c decay mode and lack of evidence in the J= 0 mode. We studied these channels in pp annihilations near the center of gravity of the 3PJ states, where the hc was reported in the J= 0 mode by E760, our previous experiment, at 3526:2 0:15 0:2 MeV, with R 1 MeV. We observe an event excess in the c mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with P 0:001. The resonance mass is 3525:8 0:2 0:2 MeV and the resonance width 1 MeV. We estimate 10:0 3:5 < ppBc < 12:0 4:5 eV, corresponding to fixed values 0:5 < R < 1:0 MeV. We find no event excess within the search region in the J= 0 mode
Results of a search for the h(c) (1)P(1) state of charmonium in the eta(c) gamma and J/psi pi0 decay modes
LO VETERE, MAURIZIO;MARINELLI, MAURO;PALLAVICINI, MARCO;PATRIGNANI, CLAUDIA;SANTRONI, ALBERTO;
2005-01-01
Abstract
We report evidence for the hc state of charmonium in its c decay mode and lack of evidence in the J= 0 mode. We studied these channels in pp annihilations near the center of gravity of the 3PJ states, where the hc was reported in the J= 0 mode by E760, our previous experiment, at 3526:2 0:15 0:2 MeV, with R 1 MeV. We observe an event excess in the c mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with P 0:001. The resonance mass is 3525:8 0:2 0:2 MeV and the resonance width 1 MeV. We estimate 10:0 3:5 < ppBc < 12:0 4:5 eV, corresponding to fixed values 0:5 < R < 1:0 MeV. We find no event excess within the search region in the J= 0 modeI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.