Observation of X(1835) in.

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Presentation transcript:

Observation of X(1835) in

Analysis of X(1835) 5.1  BESII Preliminary BESII Preliminary

Analysis of X(1835) 6.0  BESII Preliminary BESII Preliminary

Observation of X(1835) in BESII Preliminary Statistical Significance 7.7  BESII Preliminary The sum +- mass spectrum for  decaying into +- and  

Mass spectrum fitting 7.7 The sum +- mass spectrum for  decaying into +- and   7.7 BESII Preliminary

X(1835) could be the same structure as what is indicated by ppbar mass threshold enhancement X(1835) mass is consistent with the mass of the s-wave resonance indicated by the ppbar mass threshold enhancement. Its width is 1.9 higher than the upper limit of the width obtained from ppbar mass threshold enhancement. On the other hand, if the FSI effect is included in the fit of the ppbar mass spectrum, the width of the resonance near ppbar mass threshold will become larger.

Fit to J/p pbar including FSI Include FSI curve from A.Sirbirtsev et al.(hep-ph/ 0411386) in the fit (I=0) M = 1830.6  6.7 MeV  = 0  93 MeV In good agreement with X(1835)