Observation of X(1835)in 7y→yx+xn Statistical significance 7.7 o J/y→y+xn 140 E120 O寸0-z山> 141.61.822.22.42.62.83 m(tr n)(GeV/c) The ITn' mass spectrum for n' decaying into n→ππ m and n→γpObservation of X(1835) in The +- mass spectrum for  decaying into +- and   Statistical Significance 7.7          J         J