Evidence for structure in the 1.7 GeV mass region of the K +K − final state centrally produced in the reactions π+p → π+(K +K −)p and pp → p(K +K −)p at [formula omitted]

• Published in: Physics letters. B 1986, Vol.167 (1), p.133-137
• Main Authors: Armstrong, T.A., Bloodworth, I.J., Carney, J.N., French, B.R., Ghidini, B., Kinson, J.B., Lenti, V., Palano, A., Parrié, R., Print, I.C., Vassiliadis, G., Villalobos Baillie, O., Votruba, M.F., Zito, G., Zitoun, R.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(86)90560-5

The reactions π +p → π +(K +K −)p and pp → p(K +K −)p where the K +K − system is centrally produced have been studied at 85 GeV/ c. The K +K − spectrum contains several structures in the regions of S ∗ ø , f A 2 and f′. Structure is observed in the 1.7 GeV mass region which cannot be attributed to the g meson. The most likely interpretation of the data is that we observe the θ with a mass of 1.742 GeV and a new resonance at a mass of 1.629±0.010 GeV with a width of 0.082±0.030 GeV.