Observation of f_0(1770) -> #eta##eta# in p-barp -> #eta##eta##pi#~0 reactions from 600 to 1200 MeV/c

摘要

We present data on p-barp -> #eta##eta##pi#~0 at beam momenta of 600, 900, 1050, and 1200 MeV/c. At the higher three momenta, a signal is clearly visible due to p-barp -> f_0(177)#pi#~0, f_0(1770)#pi#~0, f_0(177) -> #eta##eta#. It has mass 1770+-12 MeV and width 220+-40 MeV, where errors cover systematic uncertainties as well as statistics.